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Questions  

A long rod ABC of mass “m” and length “L” has two particles of masses “m” and “2m” attached to it as shown in the figure. The system is initially in the horizontal position. The work to be done to keep it vertical with A at the bottom is (g = acceleration due to gravity)

a
2mgl
b
3mgl
c
5mgl/2
d
3mgl/2

detailed solution

Correct option is B

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The curved portions are smooth and horizontal surface is rough. The block is released from P. At what distance from A, it will stop (if μ = 0.8)?


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