Question

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3. A 5kg ball on the end of a string is whirled at
a constant speed of 1 m s'in a horizontal circle
of radius 5 m. What is the work done by the
centripetal force during one revolution ?​

Answer 1

Answer:

Mass of the body(M) = 5 Kg.

Velocity (v) = 1.0 m/s.

Radius of circle (r) = 5m.

Finding the Centripetal force.

Substituting the values,

Now,

After one revolution the Displacement will be zero.

and the angle made by the force and displacement is 90°.

As the Centripetal force is acting inwards and displacement perpendicular to it.

Now,

Work done formula,

Substituting the values ,

As cos90° = 0.

So, the work done by the Centripetal force is "Zero".

Explanation:

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