Lamar walks 20 m to the west, and then 20 m to the east. it takes him 40 seconds to do this. what is his average velocity?

Answer:

5108.7 m

Explanation:

23 m/s * 165 s = 3795 m

12 m/s * 285 =  3420 m

mag of resultant ( use pythag theorem)

sqrt  ( 3795^2 + 3420^2) = 5108.7 m

The motion of the rocket labeled a is an example of motion with uniform (i.e., constant) velocity and non- zero acceleration.

A body when covers an equal distance with an equal interval of time, this condition of the velocity is known as uniform velocity. Or, we can say that when the direction and magnitude of speed of a body do not change with time, then the body is said to be at uniform velocity.

Having a non-zero acceleration means having any amount of acceleration whatsoever. This could be either positive acceleration or negative acceleration (a.k.a. deceleration).

An object experiences a non-zero acceleration when it is speeding up, slowing down, or remaining at the same speed while changing direction. Any of these three scenarios would result in an object's velocity changing since velocity is the change in an object's position over time, and a change in velocity means the object is experiencing acceleration.

Conversely, an object has zero acceleration when it either remains stationary or moving at a constant speed in a straight line. In both of these scenarios, the velocity of the object is constant, so there is no acceleration.

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The average speed of this trip is 15.72 m/s

Given:

speed = S1 = 50.0 km/h

speed = S2 = 60.0 km/h

time taken to travel with speed S1 = 1/3

time taken to travel with speed S2 = 2/3

To Find:

average speed of this trip

Solution:

distance 1 = speed x time = 50*1000/3600 x 1/3

= 4.62 m

distance 2 = 60*1000/3600 x 2/3 = 11.1 m

Average speed = total distance/total time

= 4.62 + 11.1 / 1 = 15.72 m/s

Hence, average speed is 15.72 m/s

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A horizontally applied force of 2400 N will accelerate a 400 kg crate at 1 m/s^2.

In the given diagram, the free body diagram (FBD) of a block is shown.

Here the two vertical forces, normal reaction(N) and weight(W) cancel each other while the horizontal forces do not cancel each other and provide acceleration to the block.

According to the given situation,

Applied Force - Frictional Force = ma

Here the frictional force is half the weight of the body 2000 N.

Putting the given values in the above equation,

F - F1 = 400 x 1

F - 2000 = 400

F = 2400 N

Hence, a horizontally applied force of 2400 N will accelerate a 400 kg crate at 1 m/s^2.

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Answer:

in this problem, we have given a card of wait. £3217 is traveling in a straight line at a speed of 60 ft/s. How much force does it require to stop the car in five seconds. So here we will use a cinematic equation. We finally, is it caused to the initial plus acceleration in two times. So finally, spirit will be zero initially 60 ft/s and exhalation. We have to find And time is five seconds. Right? So we need acceleration, Which is a cost to -60 x five. That is a cost to 12 feet per second square. That means we need acceleration in the opposite direction, so we need a force which is in the opposing direction of the motion. So this force, if we talk about the magnitude, there should be equal to mass into acceleration. So this mass of card will be weight divided by G, into exploration. That is 12 serve it of cars, and 3217, And G is 32.17 in 212. So this force in pounds is equal to £1200 in the opposite direction of motion.

Explanation:

The force required to stop the car is 5334.09 Newtons. The force is negative representing the deceleration.

The car's weight to mass:

Weight = 3,217 lb

1 lb = 0.453592 kg

Mass = Weight ÷ gravitational acceleration

Mass = 3217 × 0.453592

Mass = 1459.59 kg

The initial velocity is:

Initial velocity = 60 × 0.3048

Initial velocity = 18.288 m/s

Since the car stops, the final velocity will be 0 m/s.

The acceleration is:

Acceleration = (Final velocity - Initial velocity) ÷ time

Acceleration  = -3.6576 m/s²

The force required to stop the car using Newton's second law of motion:

Force = m × a

Force = 1459.59 × (-3.6576)

Force = -5334.09 N

Therefore, The force required to stop the car is 5334.09 Newtons. The force is negative representing the deceleration.

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The largest number within three numbers is 42393 .

Solution,

First of all we have to take three numbers such as,

a: 29320 b: 41332 c: 42393

Enter three numbers: a: 29320 b: 41332 c: 42393

42393 is the biggest of all three numbers.

Taking algorithm of the above steps .

Algorithm:

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Find the total x - component of the electric field at that point and get the resultant or the algebraic sum.

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Rinse chemicals from your hands and arms with water in the sink

In the chemistry lab we use to work with chemical solutions, because of that we must learn what is the best way to manipulate the chemicals with we are going to work, so an proper way to maintain our hands and arms clean is using the lab's sink in order to wash our hands and arms with enough water

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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The density of a proton is 2.87 x 10^19 kg/m^3.

The density of a proton can be calculated by dividing its mass by its volume i.e.,

Density = Mass/Volume

The mass of a proton is given to be 1.67 x 10^-27 kg.

As the proton is assumed to be a sphere, its volume will be 4/3 π r^3.

Thus, density = 1.67 x 10^-27/ (4/3 x π x r^3)

Putting radius of proton(r) = 2.4 fm = 2.4 x 10^-15 m

The density comes out to be 2.87 x 10^19 kg/m^3.

Thus, the density of a proton is 2.87 x 10^19 kg/m^3.

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Sound travels faster in the air if the air temperature is warm

Everything comes down to the chemical composition of air and sound. Sound molecules travel faster through the air particles in warm air. So, at an air temp of 70°F at sea level, the scientific estimation of the sound speed is 767 mph. Sound, on the other hand, travels the fastest in warmer temperatures air. It moves at 740 miles per hour in subzero temperatures.

Although sound travels slower in cooler air temperatures, it can travel further. The waves are refracted from wallets of warm air and returned to the ground as a result. This sound wave then oscillates between cold and warm air and the surface, causing it to travel further.

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According to the research, the correct option is Aerobic exercise can last continuously for many minutes. It is the statement that correctly he can use to make in his description about aerobic exercise.

They are those physical activities that aim to burn fat using a high amount of oxygen.

In this sense, these exercises allow to improve the resistance of the person, they are not very intense but are developed in long periods, unlike anaerobic exercises that are more intense and brief.

Therefore, we can conclude that according to the research, the correct option is Aerobic exercise can last continuously for many minutes. It is the statement that correctly he can use to make in his description about aerobic exercise.

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Answer: Aerobic exercise can last continuously for many minutes.

Explanation:

Got it correct

A- The system's internal energy is constant since the temperature is constant. 0 deltas

B- the system receives no new or removed heat Q=0

C. Because the system's volume remains constant, it does not perform any work. 0 W=p delta v

An isothermal process in thermodynamics is a type of thermodynamic process where the system's temperature T remains constant: T = 0. A thermodynamic process known as adiabatic means that no heat is transferred into or out of the system. An isochoric process in thermodynamics is one in which the volume of the closed system experiencing the process remains constant. It is also known as a constant-volume process, isovolumetric process, or isometric process.

the complete question is :

For each of the following, which thermodynamic quantities (delta u, q, w) have values equal to zero?

A- an isothermal process

B- an adiabatic process

C- an isovolumetric process

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Answer:

OA The force exerted by the car is more than the force exerted by the snowbalL

Explanation:

If the ball's force is more than the force exerted by the car then car will be moved

Heat conduction, also named as thermal conduction, is the heat flux in a body due to temperature difference and occurs by the movement of electrons within a body.

When all the available energies such as electrical energies, chemical energies or the nuclear energies are converted to the thermal energy, the the conversion process is called heat generation.

Thermal conduction is the process when the heat transfers from hotter region to  the colder region.

In heat conduction analysis, the conversion of electrical, chemical or nuclear energy into thermal energy in solids is called as heat generation.

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The Louisiana Purchase eventually doubled the size of the United States, significantly strengthened it militarily and strategically, spurred the country’s westward expansion, and established the federal Constitution’s doctrine of implied powers.

Prior to 1803 there had been considerable Old-World interest in the Louisiana Territory. France had gained authority over the river and ownership of the majority of the Mississippi valley thanks to explorations and sporadic colonies in the 17th and 18th centuries.

The greatest land deal in American history was the Louisiana Purchase, when the United States acquired the western half of the Mississippi River basin from France in 1803 for less than three cents per acre, or 828,000 square miles (2,144,520 square kilometers).

The acquisition increased the United States’ size by twofold.

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Explanation:

physics allow us to understand the electromagnetic radiation we used to transmit data with fibre optics and satellites and to build computers that interpret those signals and transmit data on the internet

When a new path of lesser resistance is made for an existing circuit a(n) short circuit occurs.

An electrical circuit short circuit is when two nodes that are supposed to be connected at different voltages make an improper connection. This leads to an electric current that can damage circuits, cause overheating, fire, or explosions, and is only constrained by the network's remaining nodes' equivalent Thevenin resistance. While short circuits are typically the result of a failure, they can occasionally be brought on purpose, such as when voltage-sensing crowbar circuit protectors are being installed.

An electrical connection that requires two nodes to have the same voltage is known as a short circuit in circuit analysis. Since there is no resistance and hence no voltage drop across the link in a "perfect" short circuit, there is no short circuit.

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Action and reaction forces comprise the parts of a. a single interaction.

For every action, there is an equal and opposite reaction. According to Newton's third law there is an equal (in size) and opposite (in direction) reaction force for every action force. That means that forces result from interactions.

The force exerted on an object is the action, and the force experienced by the object is the reaction.

Some forces result from contact interactions like frictional, tensional and other forces are results of actions at a distance interaction like gravitational, electrical, magnetic.

It is the physical magnitude that expresses the effort necessary to move the mass of one kilogram with an acceleration of one meter per second squared, this is expressed in units of the international system in Newton.

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According to the calculation the volume of gold = 115.79ml

density is the mass of the material substance per unit volume. d = M/V, in which d is density, M is weight, and V is volume, is the formula for density.

The formula for calculating density is the weight of such an object multiplied by its volume. The mathematical formula for this is d = m/v, where s t stands for density, m for mass, and v for the volume of the item.

Mass of gold nugget =  2.20 kg

                                  = 2.20 x 1000

                                  = 2200g

Density of a gold = 19 g/cm^3

                            =  19 g /mL

Substituting the value in the formula:

Density = Mass / Volume.

volume = mass / density

volume = 2200 g / 19 g/mL

             = 115.79ml

According to the calculation the volume of gold = 115.79ml

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The force exerted by the pump is 4533.33 N

Force can be define as, that it is an external agent capable of changing an object's state of rest or motion. In a very simple word i.e. a push or pull upon an object resulting from the object's interaction with another object is also known as force and it is vector quantity . The unit of force F is Newton (N) .

F = ma

Here, F  is force, m is mass and a is acceleration of the object.

We are given that ,

The power of water pump = P = 3.4 × 10² watts

The rate of water to lift up = v = 7.5 ×10⁻²  m/s

Thus, to get the value of force F exerted by the pump to lift water up can be given as,

P = F × V

Where, p is the power , F is the force and V is the velocity of the pump. Since, the above equation can be express as,

F = P/V

F = (3.4 × 10² watts)/ (7.5 × 10⁻² )m/s

F = 4533.33 N

Therefore, the force exerted by the pump to lifted up water would be 4533.33N

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The most highly redshifted electromagnetic radiation that astronomers have detected to date is from the radiation left over from the Big Bang.

Radiation travels in waves and possesses both an electric and magnetic field. Both natural and artificial sources contribute to it. The energy levels of electromagnetic radiation can range from low to high. It consists of x-rays, gamma rays, infrared light, visible light, ultraviolet light, radio waves, and microwaves. Also known as EMR, electromagnetic radiation (EMR) is a category of energy carried by waves of the electromagnetic (EM) field that travel across space. These waves include radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. The electromagnetic spectrum includes all of these waves. Electromagnetic radiation is often made up of electromagnetic waves, which are coordinated oscillations of electric and magnetic fields. Due to the periodic alteration of the electric or magnetic field, electromagnetic radiation or waves are produced.

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The light produced by the sun is a composite white light, made up of other colors of light.

Electromagnetic radiation includes the portion of the electromagnetic spectrum that the human eye detects as light, or visible light. Visible light is typically defined as having wavelengths between 400 and 700 nanometers (nm) or frequencies between 750 and 420 terahertz, which lie between the longer-wavelength infrared and the shorter-wavelength ultraviolet (with shorter wavelengths).

In physics, electromagnetic radiation of any wavelength, whether or not it is visible, is more generally referred to as "light." In this sense, radio waves, microwaves, gamma rays, and X-rays are all types of light. The four primary qualities of light are intensity, propagation direction, frequency or wavelength spectrum, and polarization.

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The type of tire which would have the least amount of friction on a road is a  bicycle tire and is denoted as option A.

This is referred to as the force which resists the relative motion of a solid surface against each other and is directly proportional to the area of contact.

This therefore means that the largest types of tires will have the most type of friction and in this scenario, it is the truck tire. However, the bicycle tire which is the smallest will have the least amount of friction on the road and is therefore the reason why option A was chosen as the most appropriate choice.

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Answer:

99km

Explanation:

It's True that Hypothermia is an excessive decline in a body temperature.

Hypothermia is condition that occurs when the body’s temperature drops below 95° F (35° C).The normal body temperature is 98.6° F (37° C). Hypothermia is medical emergency.

When a person’s body temperature is dangerously low, the brain and the body cannot function properly. Left untreated, hypothermia can lead to the cardiac arrest (heart stops beating) and death.

The first steps when treating hypothermia are:

Move to warm, dry location. Remove the wet clothing and replace with the dry clothing. Cover up with the jacket, hat, and blanket

When hypothermia is the more severe, doctors may also need to:

Insert IV into your vein and pump warm fluids into your body. Give you warm oxygen through a mask or a breathing tube. Use machine that warms your blood and pumps it back into your body

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The horizontal force Superman must apply to throw the boulder is 3670N.

According to Newton's Second law of motion,

Force F = Mass m * Acceleration a

We know that Weight W = Mass m * Gravity g

Given,

Weight W = 2400 N

Acceleration a = 15 m/[tex]s^{2}[/tex]

Gravitational force g = 9.81 m/[tex]s^{2}[/tex]

W = m * g

Mass m = 2400 / 9.81 = 244.65 kg

Horizontal force F = 244.65 * 15 = 3669.7 N

Newton's Second law of motion states that acceleration of an object depends on force acting on the object and mass of the object.

Therefore the horizontal force Superman must apply to throw the boulder is 3670N.

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Answer:

frequency

Explanation:

speed of light = constant = wavelength * frequency

                                                changing WL or F will change the other

A laminated iron heart and windings (or coils) that transform electrical energy into the energy of a magnetic field make up the stator, the stationary component of an ac motor.

The stator, which can be found inside electric generators, electric motors, sirens, mud motors, or biological rotors, is the stationary component of a rotating system. A stator serves as a conduit for energy going to or coming from the system's rotating part.

The stator creates a magnetic field that powers the revolving armature in an electric motor; in a generator, the stator transforms this rotating magnetic field into an electric current. The stator controls the fluid flow from or to the rotating component of a fluid-powered device.

Electric charges in motion create magnetic fields. Everything is constructed of atoms, so each atom contains a nucleus that is composed of protons and neutrons, with orbiting electrons. The small moving charges known as the circling electrons lead each atom to produce a very weak magnetic field.

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The matrix of the linear transformation from ℝ2 to ℝ2 that rotates any vector through an angle of 120° in the anticlockwise direction is[tex]\left[\begin{array}{ccc}-1/2&\sqrt{3}/2 \\ \sqrt{3}/2 &-1/2\\\end{array}\right][/tex]

What is a matrix that can be taken for counterclockwise for an angle [tex]\alpha[/tex]

The matrix can be written as [tex]\left[\begin{array}{ccc} cos\alpha &sin\alpha \\ sin\alpha & cos\alpha \\\end{array}\right][/tex]

While putting the value of angle in the matrix, we have

[tex]\left[\begin{array}{ccc} cos120 &sin120 \\ sin120& cos120 \\\end{array}\right][/tex]

for [tex]\alpha[/tex] = 120

and thus, we have the answer as:

[tex]\left[\begin{array}{ccc}-1/2&\sqrt{3}/2 \\ \sqrt{3}/2 &-1/2\\\end{array}\right][/tex]

Therefore, the matrix can be stated as a matrix A of the linear transformation from r2 to r2 that rotates any vector through any angle of 120 in the anticlockwise direction.

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Answer:

21 600 m

Explanation:

4 m/s  *   3600 s / hr  * 1.5 hr  = 21 600 m