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Q.

In a carnival ride called the rotor, people stand on a ledge inside a large cylinder that rotates about a vertical axis. When it reaches a high enough rotational speed, the ledge drops away. If radius be 2 m and the period of rotation be 2 sec, then the minimum coefficient of friction for the people not to slide down is

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a

0.9

b

0.8

c

0.6

d

0.5

answer is D.

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Detailed Solution

∵μN=μmω2r=mg⇒μ=gω2r=5π2=0.506
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In a carnival ride called the rotor, people stand on a ledge inside a large cylinder that rotates about a vertical axis. When it reaches a high enough rotational speed, the ledge drops away. If radius be 2 m and the period of rotation be 2 sec, then the minimum coefficient of friction for the people not to slide down is