Physics-
General
Easy
Question
Two block of masses 
and 
are connected with a massless unstretched spring and placed over a plank moving with an acceleration 'a' as shown in figure. The coefficient of friction between the blocks and platform is 
.
- spring will be stretched is a
- spring will be compressed if a
- spring will neither be compressed nor be stretched for a
- spring will be in its natural length under all conditions.
The correct answer is: spring will be in its natural length under all conditions.
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Blocks 
are moving together on Rough horizontal surface.
A) Friction between A and B static in nature
B) Friction between A and horizontal surface is static in nature
Blocks are moving together on Rough horizontal surface.
A) Friction between A and B static in nature
B) Friction between A and horizontal surface is static in nature
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Two blocks of masses m and M are kept on a rough horizontal surface. The coefficient of friction between M and m is 
and between M and ground is 
. If both the blocks are pushed horizontally in same direction with equal speed 
.
Two blocks of masses m and M are kept on a rough horizontal surface. The coefficient of friction between M and m is and between M and ground is . If both the blocks are pushed horizontally in same direction with equal speed .
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Two blocks A and B of mass 10 kg and 20 kg respectively are placed as shown in figure. Coefficient of friction between all the surfaces is 0.2. Then find tension in string and acceleration of block B. 
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A wooden block with mass 2 m is attached to the shaft of an electric motor mounted on a plank free to move on the floor. The mass of the plank and motor is m. The initial seperation between the block and motor is l. When the motor is switched on, block moving with acceleration a. If is the coefficient of friction time after which the two bodies collide is
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A block of mass 
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Two blocks A and B of same mass are placed at the two ends of a plank C, which is placed on a smooth floor. The coefficient of friction between A and C and B and C is same and A and B both are given same velocity 
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Two blocks A and B of same mass are placed at the two ends of a plank C, which is placed on a smooth floor. The coefficient of friction between A and C and B and C is same and A and B both are given same velocity at the same time in the direction as shown. Find the correct graph :
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Two blocks, one of mass A=1 kg and another B=2 kg are shown in figure. A force of 5 N is applied on A. Coefficient of friction between A and B is 0.2 and that between B and horizontal surface is zero. Find the time taken for the front face of A to coincide with that of B
Two blocks, one of mass A=1 kg and another B=2 kg are shown in figure. A force of 5 N is applied on A. Coefficient of friction between A and B is 0.2 and that between B and horizontal surface is zero. Find the time taken for the front face of A to coincide with that of B
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The wall is rough but the contact surface between A and B is smooth. A force F is applied horizontally on B. The friction of A towards wall side in equilibrium will be :
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The minimum value of mass for which the 100 kg block can remain in static equilibrium is
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A block is in equilibrium. The minimum tension in the string is 
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A uniform rod of length L and mass M has been placed on a rough horizontal surface. The horizontal force F applied on the rod is such that the rod is just in the state of rest. If the coefficient of friction varies according to the relation 
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