Question

a ball tied to string takes 4s to complete one revolution along a horizontal circle if by pulling the cord the radius of the circle is reduced to half how much time will the ball take to complete one revolution​

Answer 1

Answer:

Let r1=r,T1=4s,r2=r2,T2=?

From the principle of conservation of angular momentum, I2ω(2)=I1ω1

mr22(2πT2)=mr21(2πT1)

or T2=r22r21T1=14×4=1s

Explanation:

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