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A block of mass m is kept in an elevation which starts moving downward with an acceleration a as shown in figure. The block is observed by two observers A and B for a time interval t0. The observer B finds that the work done by gravity on the block is
The correct answer is:
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A block of mass m moving with a velocity v0 on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers: A: standing on the horizontal surface B: standing on the block. To an observer A, the net work done on the block is
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A block of mass m moving with a velocity v0 on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers: A: standing on the horizontal surface B: standing on the block. To an observer A, the work done by the normal reaction N between the block and the spring on the block is
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A block of mass m moving with a velocity v0 on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers: A: standing on the horizontal surface B: standing on the block. To an observer A, the work done by spring force is
A block of mass m moving with a velocity v0 on a smooth horizontal surface strikes and compresses a spring of stiffness k till mass comes to rest as shown in the figure. This phenomenon is observed by two observers: A: standing on the horizontal surface B: standing on the block. To an observer A, the work done by spring force is
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A block of mass 'm' is released from rest at point A. The compression in spring, when the speed of block is maximum
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A 1.0 kg block collides with a horizontal weightless spring of force constant 2.75 Nm–1 as shown in figure. The block compresses the spring 4.0 m from the rest position. If the coefficient of kinetic friction between the block and horizontal surface is 0.25, the speed of the block at the instant of collision is
A 1.0 kg block collides with a horizontal weightless spring of force constant 2.75 Nm–1 as shown in figure. The block compresses the spring 4.0 m from the rest position. If the coefficient of kinetic friction between the block and horizontal surface is 0.25, the speed of the block at the instant of collision is
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In the figure shown all the surfaces are frictionless, and mass of the block, m = 1 kg. The block and wedge are held initially at rest. Now wedge is given a horizontal acceleration of 10 m/s2 by applying a force on the wedge, so that the block does not slip on the wedge. Then work done by the normal force in ground frame on the block in 
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In the system shown in the figure there is no friction anywhere. The block C goes down by a distance x0 = 10 cm with respect to wedge D when system is released from rest. The velocity of A with respect to B will be (g = 10 m/s2) :
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A truck starting from rest moves with an acceleration of 
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The blocks are in equilibrium. The friction force acting on 10 kg block is :
The blocks are in equilibrium. The friction force acting on 10 kg block is :
physics-General
