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Q.

Two blocks lie on each other and connected to a spring as shown in figure. What should be the mass of blocks A placed on block B of mass
6 kg, so that the system’s period is 0.75 s ? Assume no slipping, what should be the minimum value of coefficient of static friction µs for which block A will not slip relative to block B, if block B is displaced 50 mm from equilibrium position and released?

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a

2kg, μs=0.4

b

4.2kg, μs=0.358

c

2.56kg, μs≥0.358

d

2.56kg, μs≤0.358

answer is C.

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Detailed Solution

T=2πm1+m2k and m=AW2g

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