A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand
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 […]
Work Energy and Power
A spring of spring constant 5 x 10³ Nm⁻¹ is streched intially by 5 cm from
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 1 cm
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
Options
(a) 2000 N […]
The power supplied by a force acting on a particle moving in a straight line
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
Options
(a) x¹/² (b) x (c) x² […]
A bullet of mass m moving with velocity v strikes a block of mass M at rests
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
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
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
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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A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where
A body of mass 0.5 kg travels in a straight line with velocity v=a x³/², where a= 5m⁻¹/² s⁻¹.The work done by the net force during its displacement from x=0 to x=2 m is
A block of mass m moving at a velocity v collides with another block of mass 2m
A block of mass m moving at a velocity v collides with another block of mass 2m at rest.The lighter block comes to rest after collision.Find the coefficient of restitution.
Options
(a) 1/2 […]