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A pulley of radius  is rotated about its axis by a force  newton (where  is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is , the number of rotations made by the pulley before its direction of motion if reversed, is

a)

Less than 3

b)

More than 3 but less than 6

c)

More than 6 but less than 9

d)

More than 9


Question ID - 52761 | Toppr Answer

A pulley of radius  is rotated about its axis by a force  newton (where  is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is , the number of rotations made by the pulley before its direction of motion if reversed, is

a)

Less than 3

b)

More than 3 but less than 6

c)

More than 6 but less than 9

d)

More than 9

1 Answer - 5876 Votes

3537

Answer Key : (b) -

(b)

To reverse the direction  (work done is zero)

 is zero at

No. of revolution  is less than 6



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