describe the significance of laser irradiance and exposure in vp processes. how do these phenomena affect the solidification, scan pattern, and quality of a vp build? what is the difference between irradiance and exposure?

Answers

Answer 1

Laser irradiation of a solution is an effective way to generate crystal nucleinuclei.

Vat polymerisation employs a vat of liquid photopolymer resin in which the model is built layer by layer. Where necessary, an ultraviolet (UV) light is used to cure or harden the resin, while a platform moves the object being made downwards after each new layer is cured.

Because the process employs liquid to form objects, there is no structural support from the material during the build phase, as opposed to powder-based methods, which provide support from the unbound material. In this case, additional support structures are frequently required. Resins are cured using photopolymerisation (Gibson et al., 2010) or UV light, in which the light is directed across the surface of the resin using motorised mirrors (Grenda, 2009). The resin cures or hardens where it comes into contact with light.

The layer thickness lowers the build platform from the top of the resin vat downwards.
The resin is cured layer by layer with a UV light. The platform continues to descend, and new layers are added on top of the previous ones.
Some machines use a blade that moves between layers to provide a smooth resin base on which to build the next layer.
After completion, the resin is drained from the vat and the object is removed.

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Related Questions

a capacitor restores energy u1 when it holds charge q. the same capacitor stores energy u2 when it holds charge 16q. what is the ratio u2/u1?

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When a capacitor has charge q, it recovers energy u₁, and when it holds charge 16q, it stores energy u₂. u₂/u₁ has a value of 256.

Energy (E) stored in capacitor:-

[tex]U = (1/2) * C * V^2[/tex]

here U is energy,

C is capacitance, and

V is voltage across the capacitor.

Since the same capacitor is used in both cases, we can assume that the capacitance C is constant. Therefore, the ratio of energy stored is given by the ratio of the voltage squared:

[tex](u_2/u_1) = (V_2^2 / V_1^2)[/tex]

To find V2 and V1:-

C = q/V

here q is charge stored on the capacitor.

For the first case, the capacitor holds charge q, so the voltage across the capacitor is:

V₁ = q/C

The energy stored is:

[tex]U_1 = (1/2) * C * V_1^2 = (1/2) * q^2 / C[/tex]

For the second case, the capacitor holds charge 16q, so the voltage across the capacitor:-

[tex]V_2 = 16q / C[/tex]

The energy stored is:

[tex]U_2 = (1/2) * C * V_2^2 = (1/2) * (16q)^2 / C[/tex]

Reserving these values into the ratio formula:-

[tex](u_2/u_1) = (V_2^2 / V_1^2) = [(16q / C)^2 / (q / C)^2][/tex]

= [tex](16^2 * q^2 / q^2)[/tex]

= 256

Therefore, the ratio [tex]u_2/u_1[/tex] is 256.

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A 1000 kg car rests on four tires, each inflated to 2.2 bar. What surface area does each tire have in contact with the ground? (Assume the weight is evenly distributed on each wheel.)

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The surface area each tire have in contact with the ground is 0.11 m².

What is the Surface area of each tire?

The weight of the car is evenly distributed on each wheel, so each wheel supports a force of 1000 kg / 4 = 250 kg.

The force on the tire is transmitted to the ground through the tire's contact patch, which is the surface area of the tire in contact with the ground.

The tire's contact patch can be calculated by dividing the total force on the tire by the pressure of the tire:

Contact patch area = Force on tire / Pressure

= 250 kg  x 9.8 N/kg / (2.2 bar  x 10⁵ Pa/bar)

= 0.11 m²

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On a dry winter day, if you scuff your feet
across a carpet, you build up a charge and get
a shock when you touch a metal doorknob.
In a dark room you can actually see a spark
about 2 cm long. Air breaks down at a field
strength of 3 × 10^6 N/C.
How much charge have you built up? Assume that just before the spark occurs, all the
charge is in your finger, drawn there by induction due to the proximity of the doorknob.
Approximate your fingertip as a sphere of diameter 1.59 cm, and assume that there is an
equal amount of charge on the doorknob 2 cm
away.
Answer in units of C.

Answers

The amount of charge built up on your fingertip is approximately 10.08 x 10^-5 C.

How did we get the value?

The spark length of 2 cm is equal to the breakdown field strength in air, so the electric field strength between your fingertip and the doorknob is 3 x 10^6 N/C.

The electric potential difference between the two points is given by the equation:

V = Ed

Where V is the potential difference, E is the electric field strength, and d is the distance between the two points.

In this case, d is equal to 2 cm, so we can calculate the potential difference:

V = (3 x 10^6 N/C) x (2 cm) = 6 x 10^6 N m/C = 6 x 10^6 V

Next, we can calculate the charge q on your fingertip using the formula:

q = CV

Where C is the capacitance of your fingertip.

The capacitance of a sphere is given by the formula:

C = 4πε_0r

Where C is the capacitance, ε_0 is the permittivity of free space, and r is the radius of the sphere.

The diameter of your fingertip is 1.59 cm, so the radius is 0.795 cm. Plugging these values into the formula for capacitance, we get:

C = 4πε_0 * 0.795 cm = 4π * 8.85 x 10^-12 * 0.795 cm = 1.68 x 10^-11 F

Finally, we can calculate the charge on your fingertip by plugging in the values for q and C into the equation:

q = C x V = 1.68 x 10^-11 F x 6 x 10^6 V = 10.08 x 10^-5 C

So the amount of charge built up on your fingertip is approximately 10.08 x 10^-5 C.

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g a cheetah can accelerate from rest to a speed of 21.0 m/s in 6.75 s. what is its acceleration (in m/s2)? 3.11 correct: your answer is correct. m/s2

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The acceleration of cheetah from rest to a speed of 21.0 m/s in 6.75 s is 3.1m/s2.

Given the speed of cheetah (v) = 21m/s

The time of acceleration from rest to given speed (t) = 6.75s

The acceleration of cheetah = am/s^2

We know that acceleration = speed of object/time of acceleration = v/t

Acceleration is the rate of change of velocity. It is the change in speed or direction of an object over a period of time. It is related to speed and time in that it is the rate at which the speed of an object changes over a given amount of time.

then a = 21/6.75 = 3.1m/s^2

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a brick slides across a horizontal rough surface and eventually comes to a stop. what happened to the kinetic energy of the brick?

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The correct option is A,  the kinetic energy of the brick it was converted to other energy forms, mostly heat.

Kinetic energy is the strength possessed with the aid of a moving object because of its motion. Any object that is in motion has kinetic energy, regardless of its size or shape. The amount of kinetic energy an object has depends on its mass and velocity, and is given by the formula KE = 1/2 mv^2, where KE is the kinetic energy, m is the mass of the object, and v is its velocity.

Kinetic energy can be converted into other forms of energy, such as thermal energy, as a result of collisions or other interactions. It is an important concept in physics and plays a crucial role in understanding the behavior of objects in motion. The quicker an item actions, the more kinetic energy it has.

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Complete Question: -

A brick slides across a horizontal rough surface and eventually comes to a stop. What happened to the kinetic energy of the brick?

a)It was converted to other energy forms, mostly heat.

b)It was converted to a potential energy of friction.

c)It was simply destroyed in the process of stopping.

d)Nothing, it is still in the brick but is now called potential energy.

Which statement about the Native Americans in Carolina is true?

A.The Yamasee Indians left Carolina and joined the Iroquois Confederacy.

B.The Carolina settlers nearly destroyed the Cherokee tribe.

C.The Yamasee Indians joined the settlers to fight against the Cherokee.

D.The Yamasee and Tuscarora Indians left the area for new homes.

Answers

They left the Carolina's to join the Iroquois Confederacy this statement about the Native Americans in Carolina is true

What happened to the Native Americans in North Carolina ?

In North Carolina, particularly in the eastern region of the colony, a smallpox outbreak decimates the Indian population. Cherokee populations are down by 50% as a result of the outbreak. Indians from the Waxhaw tribe, ravaged by smallpox, leave their homes in modern-day Union County and join the Catawba.

Due to their frequent geographical movements in pursuit of food and other resources, the earliest residents of North Carolina were nomads. Like their forefathers, archaic humans lived nomadic lifestyles.

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uppose you have two metal cubes, one made of iron and one made of aluminum. You transfer the same amount of heat Q to each of them. Which cube will have the higher final temperature, given they have the same masses and initial temperatures?a. Iron Cubeb. Aluminum Cube

Answers

Answer:

Q = C M ΔT    where C is specific heat in cal / gm*deg C

C (Fe) = .11

C (Al) = .22

obviously ΔT has to be twice as great for Iron (Fe) as for (Al) for the same amount of heat to be transferred

ΔT = Q /(C * M)      where ΔT is the change in temperature

a) iron would have the higher final temperature

How do you solve questions 3 and 4?

Answers

Answer:

Q3) B Q4) D

Explanation:

I looked at the photo and they were circled. Hope this helps!!

3. The timeline below shows the sequence of events leading to the
Constitutional Convention. (H)






March 1781 Sept. 1783 Aug. 1786 Sept.1786 May 1787

Which conclusion can be drawn from the timeline?

A. Americans realized their first national government was not strong enough.
B. Most Americans felt the national government under the Articles of
Confederation was too strong.
C. Shays’ Rebellion had no influence on the decision to strengthen the
national government.
D. The new government was unable to negotiate a peace with Britain.

Answers

The conclusion that can be drawn from the timeline is that Americans realized their first national government was not strong enough.

The timeline shows that from March 1781 to September 1783, the United States was fighting for its independence from Great Britain, and it was during this time that the Articles of Confederation were adopted as the first national government. However, by August 1786, there were clear signs that the Articles of Confederation were not strong enough to meet the needs of the new nation. This led to the calling of the Constitutional Convention in May 1787, where the Constitution of the United States was written to establish a stronger national government that could better serve the needs of the new nation.

Therefore, option A is the correct conclusion that can be drawn from the timeline.

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If it takes 2.0h for cathy to walk from her house to her school at a rate of 1.0 m/s how far is her school from her house

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The distance Cathy's school is from her house can be calculated by multiplying the rate (1.0 m/s) by the time (2.0 h) that it takes her to walk there.

What is school?

School is an institution for teaching and learning. It is the place where students come to acquire knowledge, skills and values. It is a place where students learn to interact with peers, and to think critically and independently. School is a place where students form bonds with teachers and develop relationships with their peers. School helps students become well-rounded individuals, with a broad understanding of the world and good qualifications to pursue a chosen career. School also provides students with opportunities to explore their interests and passions, and to develop their talents.

Distance = Rate x Time

Distance = 1.0 m/s x 2.0 h

Distance = 2.0 m

Therefore, Cathy's school is 2.0 m from her house.

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the emission spectrum of each element is unique. astronomers studying the stars collect information about their brightness and the spectrum of light produced by them. these distant stars are too far away to sample physically and yet astronomers are certain that they are made of the same elements as we find here on earth. how can they be so sure?

Answers

Each element's spectra are distinct because each element has a different amount of electrons and hence various energy levels.

Astronomers can identify not only the element, but also the temperature and density of that element in the star, using spectral lines. The spectral line can also inform us about the star's magnetic field. The line's width can tell us how rapidly the material is travelling. This teaches us about the winds in the stars. Because the emission spectrum differs for each element of the periodic table, it may be used to establish the composition of a substance. One example is astronomical spectroscopy, which involves analyzing received light to determine the composition of stars. Since various elements contain varying quantities of protons and varied numbers and configurations of electrons, their spectra differ. Differences in spectra indicate variances in the amount of energy absorbed or released by atoms when their electrons travel between energy levels.

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the focal length of the lens of a simple digital camera is 5.7 mm, and it is originally focused on a flower 1.5 m away. in what direction must the lens be moved to change the focus of the camera to a tree 100 m away?

Answers

Lens of digital camera must be moved approximately 99.4 meters farther away from the flower to focus on the tree.

To change the focus of the camera from a flower 1.5 m away to a tree 100 m away, we need to move the lens to adjust the distance between the lens and the image sensor. This adjustment changes the focal length of the lens and allows the camera to focus on objects at different distances.

The focal length of the lens, f, is related to the distance between the lens and the image sensor, d, by the thin lens equation:

[tex]1/f = 1/d_o + 1/d_i[/tex]

where [tex]d_o[/tex] :object distance (lens to object distance), and [tex]d_i[/tex] : image distance (lens to image sensor distance).

For the original focus on the flower, we have:

f = 5.7 mm,

[tex]d_o[/tex]= 1.5 m, [tex]d_i[/tex] = ?

Using the thin lens equation, we can solve for d_i:

[tex]1/5.7 mm = 1/1.5 m + 1/d_i[/tex]

[tex]d_i[/tex] = 5.9 mm

The image sensor is 5.9 mm away from the lens when the camera is focused on the flower.

For the new focus on the tree, we have:

f = 5.7 mm

[tex]d_o[/tex] = 100 m, [tex]d_i[/tex] = ?

Using the thin lens equation again, we can solve for d_i:

[tex]1/5.7 mm = 1/100 m + 1/d_i[/tex]

[tex]d_i[/tex]= 5.77 mm

To change the focus of the camera from the flower to the tree, we need to move the lens by a distance Δd such that the new image distance is 5.77 mm. We can use the thin lens formula to find the new object distance:

[tex]1/5.7 mm = 1/d_o + 1/5.77 mm[/tex]

[tex]d_o[/tex] = 100.9 m

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why are x-rays used for crystallography? why not use some other, more accessible type of electromagnetic radiation such as ultraviolet light?

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X-rays are used for crystallography because they have a much smaller wavelength than visible light or UV light, making them capable of diffracting off the regular array of atoms within a crystal lattice.

The regularity of the crystal lattice causes the X-rays to undergo constructive interference, creating a diffraction pattern that can be used to determine the structure of the crystal. X-rays are also highly energetic, allowing them to penetrate the surface of the crystal and interact with the atoms in the interior. While other types of electromagnetic radiation could be used, their longer wavelengths and lower energy levels would not be able to penetrate the surface of the crystal or diffract off the atoms in the lattice, making them less effective for crystallography. X-rays are used for crystallography because they have a much smaller wavelength than visible light or UV light, making them capable of diffracting off the regular array of atoms within a crystal lattice.

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A soccer player is running at 6 m/s. He then stumbles over an opponent's foot falling and rolling to a stop. This took 4 seconds. What was his acceleration?

Answers

Answer:1.5m/s^2

Explanation:6/5=1.5m/s^2

the minimum speed required to launch an object so that it remains the same distance above the ground and just falls around the earth is called:

Answers

The minimal speed necessary for an object to maintain a circular orbit around the Earth is known as the circular orbital velocity. Hence, it just circles the planet while staying at the same height above it.

The "circular orbital velocity" is the smallest speed needed to launch an object so that it stays at the same height above the ground and simply orbits the Earth. This velocity is the speed at which an object needs to move in order to stay in a circular orbit around the Earth, such that the gravitational force of the Earth is balanced by the centripetal force required to keep the object in its circular path.

To understand this concept, consider a satellite in orbit around the Earth. The gravitational force between the satellite and the Earth pulls the satellite towards the Earth's surface. However, the satellite is also moving forward with a certain velocity, which generates a centripetal force that pulls it away from the Earth. The balance between these two forces results in a circular orbit. The speed required for this balance to occur is dependent on the altitude of the orbit. The further the object is from the Earth's surface, the lower the required speed. However, if the object is too close to the Earth's surface, the required speed becomes very high, and the object will experience atmospheric drag that could cause it to slow down and fall back to Earth. The exact circular orbital velocity at any given altitude can be calculated using the following formula:

[tex]v = \sqrt{(GM/r)}[/tex]

In summary, the circular orbital velocity is the minimum speed required for an object to stay in a circular orbit around the Earth, where the gravitational force of the Earth is balanced by the centripetal force required to keep the object in its circular path.

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three motions are listed: an object changes direction an object changes mass an object changes position which of the three is considered acceleration? a only b only a and c b and c

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Acceleration is a measure of how quickly an object changes its velocity, and is given by the rate of change of its velocity over time.

Of the three motions listed, changing direction and changing position are considered acceleration. This is because changing direction involves a change in velocity, even if the speed remains constant. Similarly, changing position involves a change in velocity, as the object is accelerating in a particular direction. On the other hand, changing mass is not considered acceleration because it does not affect the object's velocity. While it may affect other properties of the object's motion, such as its momentum or kinetic energy, it does not result in a change in velocity, and therefore is not considered acceleration. Acceleration is a measure of how quickly an object changes its velocity, and is given by the rate of change of its velocity over time.

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Answer:

A and B

Explanation:

I took the exam

a toy cannon is in a large room with ceiling at a height 8 m. the cannon fires a ball at a speed of 28 m/s. what is the maximum range of the ball if it must not hit the ceiling during its flight.

Answers

The ball can go a maximum distance of 39.2 meters as long as it doesn't collide with the ceiling while having a speed of 28m/s.

To find the maximum range of the ball fired from the toy cannon, we can use the equations of motion for a projectile. The maximum range occurs when the projectile lands at the same height from which it was fired. In this case, the ball must not hit the ceiling during its flight, so we need to ensure that the maximum height it reaches is less than the ceiling height.

The time of flight of the projectile can be calculated using the vertical component of the initial velocity and the acceleration due to gravity. Since the initial speed of the projectile is 28 m/s and the angle of elevation is not given, we can assume that the projectile is fired at an angle of 45° with the horizontal, which gives equal vertical and horizontal components of velocity. The vertical component of the initial velocity is therefore:

[tex]v_0_y = v_0 sin45 = 28/\sqrt{2 m/s}[/tex]

The acceleration due to gravity is[tex]-9.8 m/s^2[/tex]

[tex]h = v_0_y * t + (1/2) * g * t^2[/tex]

here,

h is  maximum height reached by the projectile.

At the maximum height, the vertical component of the velocity becomes zero:-

[tex]0 = v_0_y * t + (1/2) * g * t^2[/tex]

[tex]t = (v_0_y / g)[/tex]

Reserving given:-

[tex]t = (28/\sqrt{2 m/s)} / 9.8 m/s^2[/tex]

t = 2.02 s (approx.)

The horizontal range of the projectile can be calculated using the horizontal component of the initial velocity and the time of flight of the projectile.

[tex]v_0_x = v_0 cos45 = 28/\sqrt{2 m/s}[/tex]

The horizontal range:-

[tex]R = v_0_x * t[/tex]

Reserving values:-

[tex]R = (28/\sqrt{2 m/s} ) * 2.02 s[/tex]

R = 39.2 m (approx.)

Therefore, the maximum range of the ball fired from the toy cannon, without hitting the ceiling, is approximately 39.2 meters.

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A student with a mass of 75.0 kg is sitting on 4-legged lab stool that has a mass of 3.0 kg. Each leg of the stool is circular and has a diameter of 2.50 cm. Find the pressure under each leg of the stool. (Hints: (1) Remember to convert cm² to m² for the area of the legs of the stool. (2) Remember that the stool has four legs. (3) Note that the problem gives the diameter of the legs of the stool, not the radius.)

Answers

Answer:

1171,875 N/m^2.

Explanation:

First, we need to calculate the area of each leg of the stool. We can do this by finding the radius of the leg and then using the formula for the area of a circle:

Area = pi * radius^2

Diameter = 2.5 cm = 0.025 m

Radius = Diameter / 2 = 0.025 / 2 = 0.0125 m

Area = pi * 0.0125^2 = 0.00016 m^2

Next, we can find the total force being applied to each leg of the stool by the student by using the formula for weight:

Weight = mass * gravity = 75 kg * 10 m/s^2 = 750 N

Since there are 4 legs, each leg has to support 750 N / 4 = 187.5 N

Finally, we can find the pressure under each leg of the stool using the formula:

Pressure = Force / Area = 187.5 N / 0.00016 m^2 = 1171,875 Pa = 1171,875 N/m^2

So, the pressure under each leg of the stool is 1171,875 N/m^2.

d.if a third type of charge existed, how would it affect the two oppositely charged strips in this activity?

Answers

Because it would attempt to draw in all the sides at once, it would probably spiral out of control.

Electrostatics is the study of electric charges in a stationary state (static electricity). Certain materials, like amber, have been known to collect light particles after rubbing since antiquity. The Greek word for amber, v, was used to create the English word "electricity". Electrostatic phenomena are caused by the interactions between electric charges. Such forces are described by Coulomb's law.

Although certain a electrostatic forces are relatively powerful, electrostatically generated forces often appear to small. The gravitational force between two objects is about 36 orders of magnitude weaker than the force between an electron and a to proton, which make up a hydrogen atom.

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in order to pass the conductor up through the double-locking grip head, the cam's locking ring around the head needs to be in the ? position.

Answers

Unlocked position. The cam is used to lock the conductor in place, so the locking ring needs to be in the unlocked position in order for the conductor to be passed through the grip head.

What is conductor ?

A conductor is a person or object that allows the flow of electric current or heat. In electrical systems, a conductor provides a path for the electric current to flow from the power source to the device being powered. In heating systems, a conductor carries the heat from the source to the device or area that needs to be heated. Conductors are typically made of metal, such as copper, aluminum, and silver, as these materials have a higher electrical conductivity than most other materials.

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tree is placed 15 cm of converging mirror the radius of curvature is 20 cm calculate the distance of image​

Answers

A tree is placed cm from the converging mirror, and the radius of curvature is 20 cm. The distance of the image is 30 cm.

What is a converging mirror?

A converging mirror is also known as a concave mirror, whose inner side has a reflecting surface. They are called converging mirror because it converges all parallel beam of light incident on them.

u = -15cm, object distance

R = -20cm (Converging mirror)

f = R/2 = -10 cm focal length

1/v + 1/u = 1/f

1/v + 1/-15 = 1/-10

1/v – 1/15 = -(1/10)

1/v = 1/15 – 1/10 = (2 -3)/30 = - (1/30)

v = - 30 cm

Therefore, the image is formed 30 cm in front of the mirror.

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different substances have different ____________ , or abilities to reflect light.

Answers

Different substances have different reflectivities, or abilities to reflect light.

Reflectivity, also known as reflectance, is a measure of how much light is reflected by a substance compared to how much is absorbed or transmitted. It is a property of a material that depends on its chemical composition, physical structure, and surface properties. For example, a shiny metal surface such as a polished aluminum surface has a high reflectivity, meaning it reflects a large portion of the incident light. This is because metals have a smooth surface and free electrons that can move freely in response to the electromagnetic waves of the incident light, which results in a high reflectivity. On the other hand, a rough or matte surface such as paper has a low reflectivity, meaning it absorbs or scatters most of the incident light. This is because the rough surface causes light to reflect in different directions, and the material has a more complex internal structure that allows for absorption of the incident light. Different substances can also have different colors due to their reflectivity. For example, a red apple appears red because it absorbs most colors of light except for red, which it reflects. Similarly, a blue object appears blue because it reflects mostly blue light and absorbs other colors.

In summary, reflectivity is a property of a material that determines how much light is reflected compared to how much is absorbed or transmitted. Different substances have different reflectivities due to differences in their chemical composition, physical structure, and surface properties.

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When a surface is experiencing friction with another surface, how are the particles affected? Address both movement and spacing in your answer.

Answers

When two surfaces experience friction with each other, the particles on the surfaces are affected in two ways: movement and spacing. The particles on the surfaces move against each other, creating a force that resists the motion of the two surfaces. This force is known as friction. At the same time, the particles on the surfaces are also pushed apart, creating a small gap between the two surfaces. This gap is known as the coefficient of friction, and it affects the amount of friction that is experienced between the two surfaces.

Particles are affected by the friction in between the movement, this causes what we know as friction

Negative or positive and how can I know?

Answers

The charge is positive.

Is Q1 positive or negative?

We know that a charge can be positive or negative. We can see that the question is showing us the way that we can be able to obtain the magnitude of the charge that is labelled Q1 when we have the charges Q2 and Q3.

The charge Q2 can be see to be sandwiched in between Q 1 and Q2. We have seen the solution to the problem in the image that have been attached.

To know if the charge is positive or negative, we look at the sign attached to the magnitude of the charge.

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The value of charge Q1 is - 20 μC.

option A.

What is the value of charge Q1?

The value of charge Q1 is calculated by applying Coulomb's law of electrostatic force.

F = kq₁q₂/r²

where;

k is Coulomb's constantq₁ and q₂ are charges 1 and 2r is the distance between the charges

F (net) = Q12 + Q23 = 0

The force between charge 1 and 2 is calculated as;

F (12) = ( 9 x 10⁹ x 10 x 10⁻⁶ x Q1 ) / ( 2a)²

F (12) = 22,500 (Q1/a²)

The force between charge 2 and 3 is calculated as;

F (23) =  ( 9 x 10⁹ x 10 x 10⁻⁶ x 5 x 10⁻⁶) / (a)²

F(23) = (0.45) /(a²)

22,500 (Q1/a²) + (0.45) /(a²) = 0

22,500 (Q1/a²)  = -  (0.45) /(a²)

22,500Q1 = -0.45

Q1 = -0.45 / 22,500

Q1 = - 2 x 10⁻⁵ C

Q1 = -20 x 10⁻⁶ C

Q1 = - 20 μC

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The electric force is much stronger than the gravitational force, and yet the gravitational force is the dominant force that we notice in our everyday interactions and at a planetary or larger scales. why?

Answers

The electric force between these electrons is 2.40 x 1043 times bigger than the gravitational force

Why electric force is stronger than gravitational force?

However gravitational force moves on mass while the electric force acts on charge. Gravitational forces are only captivating while electric fields can be attractive/repulsive. The electric field is much stronger than the gravitational field.

Electrostatic forces are much stronger than gravitational forces. This is because gravity depends on mass, atoms have tiny masses so the gravitational forces joining them are close to zero. Whereas, the electrostatic force connected to charges is bigger.

So we can conclude that The gravitational force is extremely weak compared to the electric force.

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The reason that the gravitational force is more noticeable in our everyday interactions and at planetary or larger scales is because it is an attractive force that acts between all masses, and its strength decreases much more slowly with distance than the electric force.

What is the interaction of electric force and gravitational force?

The electric force and the gravitational force are indeed very different in their strength. The electric force between two charges is proportional to the product of their charges and inversely proportional to the square of the distance between them, whereas the gravitational force between two masses is proportional to the product of their masses and inversely proportional to the square of the distance between them. This means that for a given distance, the electric force between two charges can be many orders of magnitude stronger than the gravitational force between two masses.

However, the reason that we notice the gravitational force more in our everyday interactions and at planetary or larger scales is because it is an attractive force that acts between all masses, not just between two charged objects. This means that the gravitational force is felt by everything with mass, and it is always attractive, which means that it pulls objects toward each other. On the other hand, electric forces can be both attractive and repulsive, depending on the sign of the charges, and they are only felt by charged objects.

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what were two important data points in the light curve of star kic 8462852 that confused astronomers between may 2009 and february 2013

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Boyajian was looking at a starlight graph in the summer of 2013 and She noticed two dimming episodes from KIC 8462852 were two important data points in the light curve of star KIC 8462852.

The irregular drop and rise in brightness that does not follow a regular or expected pattern. This shift is caused by dust, which might be the result of a collision between two comets or the bursting of one. Another plausible, although less likely, reason is that the star is through unprecedented internal turmoil.

Boyajian was looking at a starlight graph in the summer of 2013 as part of a big data set acquired by the space-based Kepler telescope during its four-year mission to search for Earth-like planets near other stars. Dips in the quantity of light emitted by a star might signal the passage of a planet in front of it. The greater the size of the planet, the greater the light drop.

Boyajian's graph implied the existence of a planet larger than any scientist has ever seen — or something more crazier.She noticed two dimming episodes from KIC 8462852 during the 800th and 1,500th days of observation, when the star's luminosity reduced by 15% and 22%, respectively. A planet nearly 11 times the size of Jupiter of Earth, would result in a 1% drop — implying that whatever is circling KIC 8462852 is significantly larger than our solar system's greatest planet.

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in a ________ fault, the hanging wall block moves up with respect to the footwall block.
.A) normal B) strike slip C) reverse D) abnormal

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In a Reverse fault, the hanging wall block moves up with respect to the footwall block.

What is Reverse fault?

Reverse fault is a type of fault in which two blocks of earth's crust move away from each other, resulting in the upper block of crust being pushed up above the lower block. It is the opposite of a normal fault, in which two blocks of crust move towards each other. The reverse fault typically occurs when the Earth’s tectonic plates come together and a compressional force pushes up and over the lower plate. This type of fault is usually seen in regions of convergence between two plates and is common along convergent plate boundaries. The reverse fault is usually accompanied by large earthquakes as the plates move against each other. The reverse fault can also be caused by the bending of the Earth’s crust in response to forces such as erosion, volcanic activity and sedimentation. These forces can cause the crust to buckle and rise, resulting in a reverse fault.

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an object whose center of gravity is above its base of support will be unstable if a vertical line projected downward from the center of gravity falls outside of the base of support. true false

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An object whose center of gravity is above its base of support will be unstable if a vertical line projected downward from the center of gravity falls outside of the base of support. This statement is true.

The center of gravity of an object is the point at which its weight can be considered to act. If the center of gravity is above the base of support, the object will tend to tip over or fall if the vertical line projected downward from the center of gravity falls outside of the base of support.

If the base of support is not wide enough to counteract this torque, the object will become unstable and tip over.

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a cube has a side of 5 cm. it has a mass of 250 grams. the density of the cube is a. 50 g/cm3 and will float in water b. 2.0 g/cm3 and will float in water c. 50 g/cm3 and will sink in water d. 2.0 g/cm3 and will sink in water

Answers

To determine: A cube's density and its ability to float on water. Explanation: Side: 5 cm. Volume is equal to (side)3 = 53 = 125 cm3. Cube weight is 250 g. Cube density = mass / volume = -250

What in physics is volume?

Describe volume. Describe volume. Each thing in three dimensions takes up some space. The volume of this area is what is being measured. The space filled within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

What distinguishes the terms volume and capacity?

Volume is sometimes referred to as capacity. For instance, a cylindrical jar's volume can be used to calculate how much water it can hold. Check the cylinder's volume here. The area that any three-dimensional solid occupies is known as its volume. These solids can take the form of a cube, cuboid, cone, cylinder, or sphere.

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what happens to the brightness of bulb a if you replace bulb b with a short circuit?

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If bulb B  is replaced with a short circuit, it will effectively bypass the circuit that includes bulb A. As a result, the current in the circuit will increase, which may cause the bulb A to become brighter.

What is a circuit?

A circuit is a closed path or loop through which electrical current can flow. It is made up of various components that work together to allow the flow of electricity. The basic components of a circuit include a power source, such as a battery or generator, wires or conductors that carry the current, and various other components such as switches, resistors, capacitors, and diodes, which help to control and modify the flow of electricity.

When a circuit is closed, the electrical current flows from the power source through the components and back to the power source. This flow of electricity is usually measured in amperes (amps) and is controlled by the voltage of the power source and the resistance of the components in the circuit.

Circuits can be either series circuits, where the components are arranged one after the other in a single loop, or parallel circuits, where the components are arranged in multiple branches, allowing the current to flow through each component independently. Circuits are used in a wide range of electrical and electronic devices, from simple household appliances to complex computer systems and telecommunications networks.

If bulb B is replaced with a short circuit, it will effectively bypass the circuit that includes bulb A. As a result, the current in the circuit will increase, which may cause the bulb A to become brighter. However, it's also possible that the increased current could cause bulb A to burn out or even damage the circuit itself. In general, it's not recommended to create a short circuit intentionally as it can be dangerous and potentially cause damage to the electrical system.

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