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A painter of mass M stands on a platfrom of mass m and pulls himself up by two ropes which hang over pulley as shown in fig. He pulls each rope with force F and moves upward with a uniform acceleration a. find a, neglecting the fact that no one could do this for long time.

A U -shaped wire of mass m and length l is immersed with its two ends in mercury (see figure).The wire is in a homogeneous field of magnetic induction B .If a charge, that is a current pulse q=int idt , is sent through the wire, the wire will jump up.The amount of charge the wire reaches a hight is Nsqrt15C assuming that the time of the current pulse is very small in comparionson with the time of flight.Make use of the fact that impulse of force equals int F dt which equals mv . B=01(Wb)/m^(2),m=10gm,l=20cm&h=3meters .Then find the value of N .