Engineering
Physics
Horizontal Circular Motion
Question

A ball of mass 0.5 kg is attached to string of length 50 cm. The ball is rotated on a horizontal circular path about its vertical axis. The maximum tension that the string can bear is 400 N. The maximum possible value of angular velocity of the ball in rad/s is :

40

20

1600

1000

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Solution

T = mg cosθ + mω2r
Tmax = mg + mω2r

ω=400−50.5×50×10−2=40