Two particles of masses m₁ m₂ move with initial velocities u₁ and u₂ .On collision, one of the particle s get excited to higher level, after absorbing energy E.If final velocities of particles be v₁ […]
A particle A suffers on oblique elastic collision with a particle B that is at rest initially.If their masses are the same, then after the collision 1. their KE may be equal 2. A continues […]
A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand.The staircase has 20 steps and each steps has height of 20 cm.If he takes 20s to climb, his power […]
A spring of spring constant 5 x 10³ Nm⁻¹ is streched intially by 5 cm from the unstreched position.Then, the work required to strech it further by another 5 cm is
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(a) […]
When a bullet of mass 10 g and speed 100 ms⁻¹ penetrates up to distance 1cm in a human body in rest .The resistance offered by human body is
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(a) 2000 N […]
The power supplied by a force acting on a particle moving in a straight line is constant.The velocity of the particle varies with displacement x as
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(a) x¹/² (b) x (c) x² […]
A bullet of mass m moving with velocity v strikes a block of mass M at rests and gets embedded into it .The kinetic energy of the composite block will be
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(a) […]
A train of mass 2x 10⁵ kg has a constant speed of 20 m/s up a hill inclined at θ= sin⁻¹(1/50) to the horizontal when the engine is working at 8 x 10⁵ W.The resistance […]
A bicyclist comes to a skidding stop in 10 m.During this process, the force on the bicycle due to the road is 200N and is directly opposed to the motion. The work done by the […]
A body of mass m is accelerated uniformly from rest to a speed v in a time T.The instantaneous power delivered to the body as a function of times is, given by
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