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Q.

A block P of mass m is placed on a friction less horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. µs is the coefficient of friction between P and Q. The blocks moves together performing SHM of amplitude A . The maximum value of the friction force between P and Q is

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a

KA

b

KA/2

c

zero

d

µ2mg

answer is B.

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Detailed Solution

fmax=mAW2, w2=k2m
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A block P of mass m is placed on a friction less horizontal surface. Another block Q of same mass is kept on P and connected to the wall with the help of a spring of spring constant k as shown in the figure. µs is the coefficient of friction between P and Q. The blocks moves together performing SHM of amplitude A . The maximum value of the friction force between P and Q is