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A pulley of radius 2 m is rotating about its axis by a force =(20t - ) N (where  is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis rotation is 10 , the number of rotations made by the pulley  before its direction of motion if reserved, is

a)

More than 3 but less than 6

b)

More than 6 but less than 9

c)

More than 9

d)

Less than 3



Question ID - 53734 | SaraNextGen Top Answer

A pulley of radius 2 m is rotating about its axis by a force =(20t - ) N (where  is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis rotation is 10 , the number of rotations made by the pulley  before its direction of motion if reserved, is

a)

More than 3 but less than 6

b)

More than 6 but less than 9

c)

More than 9

d)

Less than 3

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

When direction is reversed,

s

Now,      

  Number of rotations,

127 votes


127