Questions
In the arrangement shown in fig. the ends P and Q of an unstretchable string move downwards with
uniform speed U. Pulleys A and B are fixed. Mass M rnoves upwards with a speed
detailed solution
Correct option is D
As P and Q move down, the length l decreases at the rate of U m/s.From figure (1), l2=b2+y2Differentiating with respect to time 2ldldt=2ydydt∴ dydt=ldlydt=1cosθ⋅dldt=Ucosθ.Talk to our academic expert!
Similar Questions
Two masses of I kg and 5 kg are attached to the ends of a massless string passing over a pulley of negligible weight. The pulley itself is attached to a light spring balance as shown in figure. The masses start moving during this interval; the reading of spring balance will be:
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