If two glasses of water are at the same temperature, the average kinetic energy of the particles of water in each glass is the same. Please select the best answer from the choices provided T F

Answers

Answer 1
Answer:

Answer: The correct answer is True.

Explanation:

Average kinetic energy of the particles is defined as the average of the kinetic energies of the particles present in a medium. It is the measure of temperature of the medium.

Mathematically,

K=(3)/(2)(RT)/(N_A)

where,

K = kinetic energy

T = Temperature

\text{Kinetic energy}\propto \text{Temperature}

As, kinetic energy of the particles is directly proportional to the temperature. Increase in temperature will result in the increase in the kinetic energy and vice-versa.

We are given, that the temperature of the two glasses are same, so the average kinetic energy of the particles will also remain same.

Hence, the correct answer is True.

Answer 2
Answer:

The statement ‘If two glasses of water are at the same temperature, the average kinetic energy of the particles of water in each glass is the same’ is true. This is because temperature is directly proportional with the kinetic energy of the molecules. If there is no change in temperature, there would not be kinetic movement of the molecules.


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Can the normal force on an object be directed horizontally?

Answers

For this case, the first thing you should do is take into account the definition of normal force.

By definition, we have:

  • The normal force is that which is exerted on an object that is perpendicular to the surface.

If we define the coordinate system as:

  1. Horizontal axis points to the right
  2. Vertical axis points up

Then An object resting on a wall can have normal force in a horizontal direction.

Answer:

The normal force is perpendicular to the surface. The direction can be horizontal. Example: an object on a wall.

A car traveling at 10 m/s starts to decelerate steadily. It comes to a complete stop in 20 seconds. What is the acceleration?

Answers

Answer:

a= 0.5 m/s^(2)

Explanation:

Your initial velocity (V_(o)) is 10 m/s, your time is 20 seconds. Although it is not explicitly mentioned in the problem, since you know the car comes to a stop, your final velocity (V_(f)) is 0 m/s.

The equation you can use to solve for acceleration (a) is V_(f) = V_(o) +at

1. Plug in the numbers you do have, so your equation will look like this:

0=10+a(20)

2. Solve for a.

-10= 20a

-10/20=a

-0.5= a

a = -0.5 m/s^(2)

What could you do to change the volume of a gas?

Answers

People are going to tell you about heating or cooling the gas, but
there's only one way to change the volume of a gas:  Put it into a
different container !

A gas always expands to fill whatever you keep it in ... doesn't matter
how warm or cold it is.  So the only way to make it change its volume
is to put it into a larger or smaller jar.
Heat it up to make it expand, or cool it down to make it contract. When you heat a gas, the particles of the gas get farther apart, therefore making the gas expand. The opposite happens when you make it colder.

When an object is at a distance of twice the focal length from a concave lens, the image produced is virtual and smaller than the object. What happens to the image if the object is shifted closer to the lens to a point one focal length away from it?The image produced is virtual and enlarged.
The image produced is virtual and smaller than the object.
The image produced is real and enlarged.
The image produced is real and smaller than the object.
The image produced is virtual and of the same size as the object.

Answers

Answer:

The image produced is virtual and smaller than the object.

Explanation:

For concave lens we know that

(1)/(d_i) + (1)/(d_o) = (1)/(f)

here we have

(1)/(d_i) + (1)/(2f) = -(1)/(f)

(1)/(d_i) = - (3)/(2f)

d_i = -(2f)/(3)

Magnification will be given as

M = (d_i)/(d_o)

M = -2/3

so image will be virtual and formed behind the lens

Now the object position is shifted to new position at distance of focal length

now again we will have

here we have

(1)/(d_i) + (1)/(f) = -(1)/(f)

(1)/(d_i) = - (2)/(f)

d_i = -(f)/(2)

Magnification will be given as

M = (d_i)/(d_o)

M = -1/2

So again we will have virtual image with magnification 1/2

so here size of image is less than object size by factor of 1/2 and it is virtual

The right answer for the question that is being asked and shown above is that: "The image produced is virtual and of the same size as the object." the image if the object is shifted closer to the lens to a point one focal length away from it is that The image produced is virtual and of the same size as the object.

Which instrument is used to measure the length of an object?

Answers

Answer:

Ruler. The first tool that can be used to measure length is a ruler. A ruler can be made of metal, wood or plastic. A ruler has linear measurement markings.

Explanation:

Calculating average speed

Answers


Average speed =

               (distance covered during some period of time)
divided by
               (length of time to cover that distance).