Questions
A heavy uniform bar is carried by two men on their shoulders. The weight of the bar is W If one man lets it fall from the end carried try him, the weight experienced by the other at the instant the rod is falling is
detailed solution
Correct option is C
See fig.First of all we consider the acceleration of C.M. Here, the bar turns about A with an angular acceleration α after withdrawing the support of one man.Hence Iα=Wl2 or α=Wl2IFor a bar, I=Ml2/3∴α=mgl×32×Ml2=3g2lThe linear acceleration of C.M.a=l2×α=l2×3g2l=3g4From figure, W - R = m amg−R=M×(3g/4)R=mg4=W4Talk to our academic expert!
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A body is placed on a horizontal frictionless surface. When a horizontal force F is applied on the body, it is observed that the body makes only translational motion. The which of the following points may be the positions of its centre of mass?
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