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MrRa [10]
2 years ago
14

A 5 kg rock falls from an 8 m high cliff. What is the speed of the rock when it hits the ground?

Physics
1 answer:
Levart [38]2 years ago
3 0

Answer:

3k mph

Explanation:

don't take my answer it is wrong

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The speed of sound in ice, water, and steam is shown. What best explains the speed of sound in different states of matter?
Marina86 [1]

The speed of sound is greater in ice (4000 m/s), then in water (1500 m/s), then in air (340 m/s). The explanation for this is the differente state of the matter in the three cases.

In fact, sound waves travel faster in solids (like ice), then in liquids (like water), then in gases (like air). This is because the speed of the sound wave depends on the density of the medium: the greater the density, the faster the sound wave. This can be easily understood by thinking at how a sound wave propagates: a sound wave is a vibration of molecules, which is transmitted throughout the medium by collision of the molecules. Therefore, the smaller the spacing between the molecules (such as in solids), the more efficient is the propagation, and so the sound wave is faster. On the contrary, there is a large spacing between molecules in gases (such as in the air), so there are less collisions between the molecules and so the wave is not transmitted efficiently, and so it has less velocity.

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3 years ago
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the acceleration of a body in free fall depends on the place or the world in which it is, true or false?​
Vika [28.1K]

The right answer is True

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3 years ago
Why aren't iron, cobalt and iron in the same group of elements?
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Because iron is a metal and cobalt is a non-metal
3 0
3 years ago
Do you think it is possible to control the magnetic properties of a magnet? Can a magnet be turned on and off?
Sunny_sXe [5.5K]

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Explanation:

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Electromagnets can be controlled since it basically depends on electricity. By switching on and off the electric supply the magnets also can be switched on and off respectively. We can also control the intensity of magnetic power.

On the other hand permanent magnet cannot be switched on and off but the magnetic properties can be altered event to an extent when it loses all its magnetic properties. It can be caused by high temperature, physical impact and also exposure to other magnetic fields. For every element there is a point of temperature called curie temperature above which the permanent magnet loses its magnetic properties. This can be brought back again by induced magnetism. The only issue is that induced magnetism work in most cases but not in all.

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I can't understand
alexdok [17]

Answer:

turtle

Explanation:

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