A solid spherical ball of radius 
m is connected to a point A on the wall with the help of a string which makes an angle 
= 45° with the vertical. The sphere can rotate freely about its central axis and it is set into rotational motion against the vertical face of the wall with an angular velocity 100 rad s -1 . In how much time (in s) will it come to rest? [ 
= 0.1]
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
20
FED of the spherical ball
For translational equilibrium
Tcos15° =Mg + 
Tsinl5° = N
Also 
Solving we get t = 20 s
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