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seraphim [82]
3 years ago
12

I). Mechanical energy is the sum of potential energy and kinetic energy in an object that is used to do work.

Physics
1 answer:
Dmitry_Shevchenko [17]3 years ago
4 0

Answer:

false statement : b )  For the motion of a cart on an incline plane having a coefficient of kinetic friction of 0.5, the magnitude of the change in kinetic energy equals the magnitude of the change in gravitational potential energy

Explanation:

mechanical energy = potential energy + kinetic energy = constant

differentiating both side

Δ potential energy + Δ kinetic energy = 0

Δ potential energy = -  Δ kinetic energy

first statement is true.

Friction is a non conservative force so inter-conversion of potential and kinetic energy is not possible in that case. In case of second  option,  the correct relation is as follows

change in gravitational potential energy = change in kinetic energy + work done against friction .

So given 2 nd  option is incorrect.

In case of no change in gravitational energy , work done is equal to

change in kinetic energy.

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<u>Explanation:</u>

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When equating both the equations, we can find length of wire as below, where \pi=\frac{22}{7}

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