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julsineya [31]
3 years ago
7

in which activity is no work done? A. pushing a shopping cart B. climbing stairs C. holding a brick D. lifting a book

Physics
1 answer:
Vesnalui [34]3 years ago
3 0
Your answer is c holding a brick doesn't contain movement, but energy to grip on it.

hoped it helped!!!
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If the light from the sun has higher frequencies from one side of the sun than from the other side, it is proof that the Sun is rotating.

Doppler effect states that, if a person is standing still and a source ( sound / light ) is moving towards him, the frequency of the wave emitted from the object will increase and if the source ( sound / light ) is away from him, the frequency of the wave emitted from the object will decrease.

So, if the light from the sun has higher frequencies from one side of the sun than from the other side, it means that the Sun is rotating. The higher frequencies points are the points that rotating towards Earth and lower frequencies points are the points that rotating away from Earth.

Therefore, if the light from the sun has higher frequencies from one side of the sun than from the other side, it is proof that the Sun is rotating.

To know more about Doppler Effect

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When temperature is held constant, the pressure and volume of a gas are not proportional.

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