A) an electron has an initial speed of 226000 m/s. if it undergoes an acceleration of 4.0 x 1014 m/s2, how long will it take to reach a speed of 781000 m/s? answer in units of s.

The freely falling apple will travel 268.32 meters along y-axis

We need to know about free fall motion to solve this problem. The free fall motion should follow this rule

vt = gt

vt² = 2gh

h = 1/2 . g . t²

where vt is final velocity, g is the gravitational acceleration (9.8 m/s²), h os height and t is time.

From the question above, we know that

t = 7.4 s

Use the third equation to get the distance (height)

h = 1/2 . g . t²

h = 1/2 . 9.8 . 7.4²

h = 268.32 m

The freely falling apple will travel 268.32 meters along y-axis.

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Formula:
distance traveled divided by time taken.

So 1.80 Divided by 30 =  0.06
Tabitha's average speed = 0.06

All Done!

The acceleration of the motor bike is 4 m/s².

To find the acceleration, the given values are,

Final velocity = 60 m/s

Initial velocity = 0 m/s

Time period = 15 seconds.

                     a = (vf - vi) / t m/s²

Acceleration  =  (change in speed) / (time for the change)

a = acceleration

vf = final velocity

vi= starting velocity

t  =  time

So the formula,

           a = Δv / t m/s²  

              =  (60 m/s)  /  (15)        

              = 4 m/s².

The acceleration of the motor bike is 4 m/s².

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The speed when it collides with a metal atom = 27.5m/s

A particle or item in motion has a form of energy called kinetic energy. When work, which entails the energy transfer is done on an object by applying a net force, that object acquires kinetic energy.

In the electric field, the electron loses potential energy while gaining kinetic energy. You may calculate the kinetic energy as

[tex]K=\frac{m_e v^2}{2}=e E d[/tex]

Here,

[tex]\text { } m_e=9.11 \cdot 10^{-31} \mathrm{~kg}[/tex] is the mass of the electron;

[tex]e=1.6 \cdot 10^{-19} C[/tex] is the charge of the electron;

E is the electric field;

The distance that an electron travels is called d;

When we solve for the electron's speed, we arrive at:

[tex]v=\sqrt{\frac{2 e E d}{m_e}}[/tex]

Calculate yields:

[tex]v=\sqrt{\frac{2 \cdot 1.6 \cdot 10^{-19} C \cdot 0.060 N / C \cdot 3.6 \cdot 10^{-8} \mathrm{~m}}{9.11 \cdot 10^{-31} \mathrm{~kg}}} \approx 27,5 \mathrm{~m} / \mathrm{s}[/tex]

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By elasticity, the most nearly load is D. 12370 N .

We need to know about elasticity to solve this problem. In elasticity, stress can be determined as

σ = e . δ

where σ is stress, e is elastic modulus and δ is the strain

From the question above, we know that:

e = 70 GPa = 70 x 10⁹  Pa

d = 15 mm = 0.015 m

δ = 0.001 mm/mm

Find the stress

σ = e . δ

σ = 70 x 10⁹ . 0.001

σ = 7 x 10⁷ Pa

Find the surface area of the aluminum rod

A = πR²

A = π(0.015/2)²

A = 1.77 x 10¯⁴ m²

Find the load

F / A = σ

F = σ x A

F =  7 x 10⁷ x  1.77 x 10¯⁴

F = 12375 N

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The liquid at the top is the one with a density of 0.79 g/ml.

The matter with most density will stay at the bottom of the graduated cylinder. So when comparing the three given densities of 1.15 g/ml, 0.79 g/ml and 0.95 g/ml, the lowest density is 0.79 g/ml.

Density is nothing but weight of the matter. So basically the lighter one stays at top.

Therefore, the liquid at the top is the one with a density of 0.79 g/ml.

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The directions of the vectors for velocity and acceleration are in the opposite directions.

Velocity vector is the rate of change of position of an object. Acceleration vector is the rate of change of velocity of an object.

Therefore, the directions of the vectors for velocity and acceleration are in the opposite directions.

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The vernal equinox in the year AD 10000 will lie in the constellation Scorpio.

Once every 25800 years a full cycle of precession is completed. There are 12 constellations which means it takes 25800 / 12 = 2150 years to move from one constellation to the next one. The order in which the vernal equinox moves from Aquarius is Capricorn, Sagittarius, Scorpio, Libra etc.

Now the year is 2022 AD where the vernal equinox just entered constellation Aquarius. In 4172 AD it would have entered constellation Capricorn, then constellation  Sagittarius in 6322 AD, then constellation  Scorpio in 8472 AD and then constellation  Libra in 10622 AD. This means that in 10000 AD it is still in constellation  Scorpio and yet to enter constellation  Libra.

Therefore, In the year 10000 AD, the vernal equinox will lie in the constellation Scorpio.

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A fan blows the air and gives it kinetic energy, an hour after the fan has been turned off, the kinetic energy turns into thermal energy.

The fact that all energy is conserved causes a heat flow, which raises internal (or thermal) energy, as the air molecules slow and lose kinetic energy.

Kinetic energy, which may be seen in the movement of an object, particle, or group of particles, is the energy of motion. Any moving item uses kinetic energy, such as a person walking, a baseball being thrown, a piece of food falling from a table, or a charged particle in an electric field.

The energy of a body in motion, or kinetic energy (KE), is essentially the energy of all moving objects. Along with potential energy, which is the stored energy present in objects at rest, it is one of the two primary types of energy.

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Planck find the correct curve for the specturm of light emitted by a hot object by vibrational energies of the atomic resonators were quantized.

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At the pH of 4.24, both the concentration of clo- and hclo are equal.

The equal concentration of clo- and hclo are 5.75 x [tex]10^{-5}[/tex] M

When chlorine dissolves in water, a weak acid called hypochlorous acid is created. This acid then partially dissociates to produce hypochlorite or ClO. Oxidizers and the main disinfectants in chlorine solutions are HClO and ClO.

It is impossible to extract HClO from these solutions because it equilibrates with chlorine very quickly.

Many commercial bleaches, deodorants, and disinfectants contain the related chemicals sodium hypochlorite (NaClO) and calcium hypochlorite (Ca(ClO)2) due to their potent antibacterial qualities.

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If a sprinter reaches his top speed of 10.9 m/s in 2.84 s , his total time to cover a distance of 100 m is 10.59 sec

We know that,

a = u / t

s = ut + 1/2 a[tex]t^{2}[/tex]

where,

s = Distance

u = Initial velocity

a = Acceleration

t = Time

Given that,

Top speed = 10.9 m / s

Time taken to reach top speed = 2.84 s

a = 10.9 / 2.84 = 3.83 m / [tex]s^{2}[/tex]

During the time period of 2.84 s, the distance covered is ,

s = ( 0 * 2.84 ) + 1/2 ( 3.83 * [tex]2.84^{2}[/tex] ) = (3.83 * 8.07) / 2

s = 15.44 m

Consider the sprinter maintains a constant acceleration after reaching his top speed.

The distance remaining in 100 m track = 100 - 15.44 = 84.56 m

Time taken to cover 84.56 m at 10.9 m / s with no acceleration is

84.56 = ( 10.9 * t ) + 1 / 2 ( 0 ) ( [tex]t^{2}[/tex] )

t = 7.75 s

Total time taken = 7.75 + 2.84 = 10.59 s

Acceleration is the rate of change of velocity. It is represented as a. Its unit is m / [tex]s^{2}[/tex]

Therefore, if a sprinter reaches his top speed of 10.9 m/s in 2.84 s , his total time to cover a distance of 100 m is 10.59 sec

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For a pure substance, the melting temperature range is low

The melting point range is widened as a result of impurity addition, which lowers the melting point. The melting point range is reduced because pure substances have greater melting points.

The typical definition of the melting point is the temperature at which a substance transforms from a solid to a liquid.

The melting point of a liquid is the temperature at which the liquid transforms from a solid to a liquid under atmospheric pressure. This is the location where the liquid and solid phases are equally present.

By placing a tiny amount of an organic solid into a tiny capillary tube, affixing it to the stem of a thermometer centred in a heating bath, slowly heating the bath, and observing the temperatures at which melting begins and is complete, it is possible to determine the melting point of an organic solid.

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Answer:

1,226,666.6666 g/cm3

Explanation:

Density =Mass/Volume

=1.840 kg(×1000g) / 0.0015

=1,226,666.6666666 g /cm3

The volume of the balloon after 67 hours would be 119.98 L

mol of he = 4.90 mol

wt. of he = 4.90x 4 = 19.60 g

after 67 hours,

67 x 10 x [tex]10^{-3}[/tex] x 4 = 2.68 g

we know 1 L = 1000 g

so, volume of gas = 2.68 x [tex]10^{-3}[/tex] L

amount left = 16.92 g = 16.92 x [tex]10^{-3}[/tex] L

thus, volume after 67 hours = 119.98 L

A weather balloon, or also known as the sounding balloon, is a specially crafted balloon that is used to carry instruments above to the sky to send back information to the radio signal centres about atmospheric pressure, temperature, humidity and wind speed by means of a small, expendable measuring device called a radiosonde.

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It is crucial to warm crucibles before use to lessen thermal stress on them.

Crucibles and covers are made up of porcelain that are like ceramic that contains pores in it. Any kind of water molecules from the air gets trapped in the pores of these crucible and cover.

These water molecules need to be driven out before the initial massing of the crucible and cover. The preheating helps to drive out these water molecules from the pores.

By raising the crucible’s temperature to 200°C, moisture will be removed in this step. Crucibles are protected from potential moister risk by the moister elimination procedure.

Crucibles that are brand-new or have seen a lengthy pause should be progressively heated to 200°C.

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An average cyclist travels at a speed of 23 mph. Time (t) = 5.1 hours if she wants to ride 190 kilometers.

The distance traveled in a unit of time is called speed. It refers to a thing's rate of movement. The scalar quantity known as speed is the velocity vector's magnitude. It has no clear direction. A faster rate of movement is indicated by a higher speed. It travels slower if the speed is lower. It has zero speed if it isn't moving at all.

The formula: can be used to determine the constant velocity of an object traveling straight forward.

r = d / t

where

r stands for rate or speed (sometimes denoted as v, for velocity)

d is the traveled distance.

t the amount of time needed to finish the movement

The average speed of an object over a period of time is given by this equation. We can see the object's average speed here, however at some moments over the time frame, it may have been moving faster or slower.

As the time interval gets closer to zero, the maximum average speed is reached. The speed at that moment is what you see when you look at a speedometer in an automobile. While you may have briefly reached a speed of 60 mph, your average speed over the course of 10 minutes could have been much higher or much lower.

190 Km (given)

1 km = 0.621 miles (should know)

So, 190 km = (190x0-621) miles

                  = 118 miles

23 miles per hour means,

23 miles- 1 hour

so, 118 miles - (118 × 1/ 23) hour

118 miles = 5.1 hour.

Time (t) = 5.1 hour

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The average fixed cost per unit at an activity level of 5,200 units is $6.00.

The average fixed cost (AFC) is fixed cost that does not change with the change in the number of goods and services produced by a company. To put it in a nutshell, average fixed cost (AFC) is the fixed cost per unit and is calculated by dividing the total fixed cost by output level.

Since no cost is fixed for a long time, average fixed cost is only for a short run. When units of production increase, the average fixed cost per unit decreases. Similarly, when the business produces less units, average cost increases per unit.

However, only one unit, mostly capital, is fixed. Examples of average fixed cost are the salaries of permanent employees, mortgage payment on machinery and plant, rent, more.

Average Fixed Cost Formula:

AFC = Total fixed cost/Output (Q)

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The correct answer is Sustainability.

Sustainability is the main issue when evaluating energy sources for future generations.

Sustainable development is used to fulfill present demands without compromising the capacity of future generations to meet their own requirements. The assertion is accurate and offers a goal that many people want, but it makes no recommendations or guarantees about how to gauge progress toward sustainable development. Sustainability is frequently used interchangeably with "sustainable development".

The twenty-first century's primary engine of progress is energy. This query does not have the graph displaying the various energy sources, but I will do my best to assist you.

You must keep in mind that when choosing energy sources to reduce environmental deterioration, sustainability is the main consideration for future generations.

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The correct answers are:

The chart shows that (A. coal) was the main source of energy used in power plants.

To understand this chart in terms of climate change, scientists need to find out (B. how much carbon dioxide is emitted by each source).

For future generations, they also need to think about (B. how to maximize the use of clean sources of energy).

Explanation:

two strings fire sticks water

Answer: i would bring a flashlight, cans of food , water filter, swiss army knife, rope, and a radio

Explanation:

The wavelengths in air is 8.8x10^-6 m for sounds in the maximum range of human hearing.

Wavelength is the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire.

The following equation can be used to compute wavelength: wavelength = wave velocity/frequency. In most cases, wavelength is measured in metres. Greek letter lambda is used to represent wavelength, so = v/f.

speed = wavelength x frequency or wavelength = speed / freq

for f = 20Hz, wavelength = 343m/s / 2.0 x 10^1 Hz = 17.2m

for f = 20,000 Hz, wavelength = 343m/s / 20,000Hz = 0.017 m

39MHz = 39x10^6 Hz so wavelength = 343m/s / 39x10^Hz = 8.8x10^-6 m

Hence, the wavelengths in air is 8.8x10^-6 m

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Considering the definition of speed and velocity, the difference is that speed has no direction while velocity does take direction into account.

Speed ​​is a quantity that expresses the relationship between the space traveled by an object.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves .

Velocity is a physical magnitude that relates the displacement of an object, the time it takes to make this change in position and direction.

Because the speed also considers the direction in which the displacement of an object occurs, it is considered a vector magnitude.

The difference between speed and velocity is that speed has no direction, that is, speed is a scalar, while velocity does take direction into account, being a vectorial magnitude.

In, summary, the difference is that speed has no direction while velocity does take direction into account.

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a. The measurement done by Bill is more precise than Tom. Because all the measurements done by Bill are measured up to mm and which are very close to each other, but for Tom's measurement value measured up to cm.

b. The measurement done by Tom is more accurate than Bill's measurement. Because the actual scale of meter scale is close to 1.001m, which is off by 1mm, but Bill's meter stick is 1.05m, which have errors in centimeters.

Length is one of the fundamental units in system of measurement. The SI unit of the length is meter. The meter scale is apparatus for measurement of the length of any object. Example: The length of square is 5 meters. Here, 5 is magnitude of the length and meter is the unit of length. 1 meter of meter scale is divided into 100 centimeters. Meter scale is used to measure the Length.

Note: The meter scale reading does not change with the temperature and other physical quantities. The scale used for measurement should not be affected by the physical environment, it should be available easily. Thus, to make any device for measurement of physical quantity above criteria should be kept in mind.

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Answer:

-2.33 m/s^2

Explanation:

initial speed u = 7m/s

final speed v= 3s

acceleration a = (v-u)/t

a= -7/3= -2.33 meter per second square.

The unit of force in metric system is Newtons

A metric system is used for measuring things using units like mm, cm, m and km for length, g and kg for weight, s for time etc.

Newton can be defined as 1 kg m / [tex]s^{2}[/tex].

where,

kg = Kilogram

m = Meter

s = second

As we can clearly see all these units are part of metric system.

Therefore, the unit of force in metric system is Newtons

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Answer:

0.7 g/cm^3

Explanation:

Density = Mass / Volume

             = 84g / 120 cm^3

             = 0.7 g / cm^3

The output force of the given lever is determined as 32 Joules.

The output force of an object is the product of load or weight of an object being lifted and distance through which the load moves.

The output force of the given lever is calculated as follows;

Output force = Load x distance moved load

Output force = 8 N x 4 m

Output force = 32 Joules

Thus, the output force of the given lever is determined as 32 Joules.

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By Avogadro's number, the positive charge of plutonium is 4.5 x 10⁸ C.

We need to know about Avogadro's number to solve this problem. Avogadro's number is the number that explains how many atoms are in one mol. The Avogadro's number is

Na =  6,02 × 10²³ atoms / mol

From the question above, we know that

m = 1.21 kg = 1210 g

Ar = 244

λ = 94 protons/atom

By using Avogadro's number, we can calculate how many plutonium atoms

N = Na . n

N = 6,02 × 10²³ x gr/Mr

N = 6,02 × 10²³ x 1210/244

N = 3.01 x 10²⁵ atoms

Find the protons

protons = λ . N

protons = 94 . 3.01 x 10²⁵

protons = 2.83 x 10²⁷

Each proton has a charge 1.6 x 10¯¹⁹ C. Hence, the positive charge of plutonium is

Q = 2.83 x 10²⁷ . 1.6 x 10¯¹⁹ C

Q = 4.5 x 10⁸ C

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In the system, kinetic energy from the moving water of the faucet turns the turbine. The Mechanical energy of the spinning turbine generates Electrical energy which is transformed into Thermal energy that causes the temperature of the water to increase. The water then becomes steam and gives off more Thermal energy into the atmosphere.

The mechanical energy spend on the turbine to spin would generate electrical energy. This electrical energy then converts the moving electric charge into thermal or heat energy. The heat would convert water to steam.

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