The images are appearing blurred as we have tried to keep small size of the pdf file 1. A bob is hanging over a pulley inside a car through a string. The second end of the string is in the hand of a person standing in the car. The car is moving with constant acceleration a directed horizontally as shown in figure. Other end of the string is pulled with constant acceleration a vertically. The tension in the string is equal to car a 4. (a) 20N (b) 10N (c) 12N (d) 15N Three blocks A, B and C of equal mass m are placed one over the other on a smooth horizontal ground as shown in figure. Coefficient of friction between any two blocks of A, B and C is 1/2. a m 2. (a) m g 2 + a2 (b) m g 2 + a 2 - ma (c) m g 2 + a 2 + ma (d) m (g + a) The two blocks, m = 10 kg and M = 50 kg are free to move as shown. The coefficient of static friction between the blocks is 0.5 and there is no friction between M and the ground. A minimum horizontal force F is applied to hold m against M that is equal to F m M 3. 5. The maximum value of mass of block D so that the blocks A, B and C move without slipping over each other is (a) 6 m (b) 5 m (c) 3 m (d) 4 m Two blocks of masses m1 = 4kg and m2 = 6 kg are connected by a string of negligible mass passing over a frictionless pulley as shown in the figure below. The coefficient of friction between the block m1 and the horizontal surface is 0.4. When the system is released, the masses m1 and m2 start accelerating. What additional mass m should be placed over mass m1 so that the masses (m1 + m) slide with a uniform speed? Smooth m m1 (a) 100 N (b) 50 N (c) 240 N (d) 180 N What is the maximum value of the force F such that the block shown in the arrangement, does not move? F Âľ= 60Âş M ARK YOUR RESPONSE m = 3kg 1. m2 1 2 3 (a) 12 kg (c) 10 kg 2. 3. (b) 11kg (d) 2 kg 4. 5.