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5 September, 07:53

A student is sitting on a frictionless rotating stool with her armsoutstretched holding equal heavy weights in each hand. If shesuddenly lets go of the weights will her angular speed:

a. get faster

b. get slower

c. stay the same

d. stop

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Answers (1)
  1. 5 September, 08:17
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    option (a)

    Explanation:

    As no external torque is applied so the angular momentum is conserved.

    Angular momentum having weights = angular momentum without weights

    Angular momentum = moment of inertia x angular speed

    As student go off the weighs, the moment of inertia decreases and thus, the angular velocity increases.

    Thus, option (a) is correct.
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