Grade 12Mechanics
A bob is suspended from a crane by a cable of length l=5m.the crane & load are moving at a constant speed v°.thye crane is stopped by abumper & the bob on the cable swings out an angle of 60°.find the initial speed V°.(g=9.8m/s^2)
1 Answer
Smit Dama
In this question,the cable does not work on the bob.So,the bobs energy is conserved.1/2 mV2 = mgh .......(1)here, h= l cosθ = 5 cos60 = 5/2 .......(2)from equations (1) and (2), we find1/2 mV2 = m×9.8×5/2V2 =49 V=7 m/sec
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