Laws Of Motion Question 142

Question: A coin is placed at the edge of a horizontal disc rotating about a vertical axis through its axis with a uniform angular speed 2 rad s1 . The radius of the disc is 50 cm. Find the minimum coefficient of friction between disc and coin so that the coin does not slip (g=10ms2) .

Options:

A) 0.1

B) 0.2

C) 0.3

D) 0.4

Show Answer

Answer:

Correct Answer: B

Solution:

[b] f1=μmg, friction will provide the necessary centripetal force f=mω2r

ff1mω2rμmg

μω2rg=22×50/10010

μ0.2



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