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3 years ago

Why do liquids solidify when cooled

Physics

2 answers:

Lena [83]3 years ago

5 0

Because the liquid loses its kinetic energy and the particles in the liquid begin to slow down.

Zinaida [17]3 years ago

3 0

Because when liquids are cooled the molecules slow down and that causes liquids to freeze

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A person jumps forward off the front of a stationary boat floating on a lake. Identify the reaction force in this case, between

Mamont248 [21]

<span>The boat applying a force on the person pushing her forward.
</span>
Hope this helps!

3 0

3 years ago

A physics student spins a bucket of water over her head in a circular path in order to demonstrate centripetal force. She fills

Ronch [10]

Answer:

The first case requires more force to spin de bucket.

Explanation:

As we know, the centripetal force is directly proportional to the mass, the equation is given by:

$F_{c}=ma_{c}$

The first case has a quarter more water than the second case, therefore the first case requires more force to spin de bucket.

I hope it helps you!

3 0

3 years ago

Earth-orbiting astronauts feel weightless in space because _____. Choose all that apply. 1 point They are in free-fall motion. T

STALIN [3.7K]

Answer:

They are in free-fall motion.

Explanation:

The Earth orbiting astronauts are falling at an acceleration that is the same or greater than the acceleration due to gravity i.e., 9.81 m/s². If you are continuously falling at this rate then you will feel weightless.

This same effect is felt while going down in an elevator. When you down in an elevator you feel that you are lighter and feel that something is pushing you up. Earth-orbiting astronauts feel the same effect but the accelration is greater hence they feel weightless.

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3 years ago

What happens to particle spacing when temperature increase, What we call this process?

Slav-nsk [51]

Answer:

The atoms start vibrating really fast, making the space between them larger. It's an increase in Kinetic Energy.

6 0

4 years ago

Which has a greater buoyant force on it, a 25.0 cm3 piece of wood floating with part of its volume above water or a 25.0 cm3 pie

kozerog [31]

Answer:

piece of submerged iron

Explanation:

The buoyant force is given by:

$B=\rho_L V_{sub} g$

where

$\rho_L$ is the density of the liquid (in this case, water)

$V_{sub}$ is the submerged part of the object

g is the acceleration due to gravity

In this problem, the liquid used in the two examples is the same, water, so $\rho_L$ is the same; and g is the same as well. Therefore, the only difference between the two examples is $V_{sub}$ .

For the piece of wood, we are told that the object is floating, so only a fraction of its total volume of 25.0 cm3 will be submerged: therefore the submerged volume will be less than 25.0 cm3. On the contrary, the problem tells us that the piece of iron is submerged, so the submerged volume in this case is 25.0 cm3. Therefore, the submerged volume for the iron is greater than for the piece of wood, so the buoyant force of the piece of iron is greater.

8 0

3 years ago