Questions
The two pulley arrangements shown in the figure are identical. The mass of the rope is negligible. In (a) the mass m is lifted up by attaching a mass 2m to the other end of the rope. In (b). m is lifted up by pulling the other end of the rope with a constant downward force of 2mg. The ratio of accelerations in two cases will be
detailed solution
Correct option is C
For first case,a1=m2−m1m1+m2g=2m−mm+2m=g3 .......(i)For second case,From free body diagram of m,ma2=T−mgma2=2mg−mg [ As T=2mg]a2=g From (i) and (ii) ,a1a2=g/3g=1/3Talk to our academic expert!
Similar Questions
Figure shows block A a motor C mounted on a with combined mass m and another block B of mass 2m. Block B is attached to shaft of motor with a light inextensible string. Motor is switched on at t =0 and string starts winding on its shaft and block B starts moving at acceleration a. If initial separation between blocks is l then find the time after which the two bodies will collide. The friction coefficient between blocks and ground is .
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