Question

A body of mass 42 kg moves in a circular ground of radius 42m and comes back to the same point . find the work done & its power if it takes 10s to complete a rotation .​

Answer 1

Answer:

0 work done

0 power

Explanation:

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Answer 2

Given :

Mass of the body = 42kg

Radius of circular path = 42m

To Find :

Work done and power of body after completing a rotation.

Solution :

❖ We know that work done is measured as the product of force and displacement.

• Displacement is defined as the shortest distance between initial and final position of the entire journey.
• It is a vector quantity having both magnitude as well as direction.
• SI unit : m

After completing a rotation, body comes back to the initial position. Hence displacement of body will be zero.

∴ Work done = 0

Power is defined as the rate of work done per unit time.

In this case work done is zero$.$

Hence power is also zero.