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Application of Newtons laws

Question

What force (in N) must man exert on rope to keep platform in equilibrium. (Take g=10m/s2)

Moderate
Solution

3T=900T=300N



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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 μ.


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