Q29 of 42 Page 34

Block A of weight 100 N rests on a frictionless inclined plane of slope angle 30° (Fig. 5.7). A flexible cord attached to A passes over a frictionless pulley and is connected to block B of weight W. Find the weight W for which the system is in equilibrium.


For system to be in equilibrium, the forces should balance out.

For block B, the equation is:


—————(1)


For block A the equation is:


—————(2)


Substituting value of F from




So the weight of the block should be 50N.


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