Rotational Motion Question 183

Question: A sphere of mass ?m? is given some angular velocity about a horizontal axis through its centre and gently placed on a plank of mass ?m The coefficient of friction between the two isμ . The plank rests on a smooth horizontal surface. The initial acceleration of the plank is

Options:

A) Zero

B)(7/5)μg

C) μg

D) 2μg

Show Answer

Answer:

Correct Answer: C

Solution:

[c] FBD for sphere and block

a1=frm=μmgm,a2=frm=μmgm

a1=μgi^,a2μgi^



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