Questions
A bob of mass 10 kg is attached to a wire 0.3 m long. Its breaking stress is . The area of cross-section of the wire is . What is the maximum angular velocity with which it can be rotated in a horizontal circle?
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Correct option is B
FA=mw2lA=4.8×10+7w2=4.8×10+7×10-610×0.3=16W = 4 rad/sec
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One face CD of a brass cube ABCD having length of side 10 cm is fixed and a tangential force is applied on the free face A. As a result the angular displacement of the other face is 0.18o. If shear modulus of brass is , the elastic potential energy stored in the cube is
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