Questions
A block is dragged on a smooth plane with the help of a rope which with a velocity v as shown in fig. The horizontal velocity of the block is
detailed solution
Correct option is B
See fig. The angle 0 and lengths l vary with time.Let at any instant, the length AB be /. Thenx2+y2=l2 or 2xdxdt+2ydydt=2ldldtThere is no vertical motion of the block. So,dydt=0,dxdt=Vx and dldt=V∴2xVx=2lv or vx=lxvor vx=v(x/l)=Vsinθ.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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