A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest
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(a) at the highest […]
A boat is sent across a river with a velocity of 8 km/h.If the resultant velocity of boat is 10 km/h,then velocity of river is
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(a) 10 km/h (b) 8 km/h (c) […]
Which of the following statement about scalar quantity is true?
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(a) A scalar quantity is the one that is conserved in a process (b) A scalar quantity is the one that can […]
The sum of the magnitudes of two forces acting at a point is 16 N.The resultant of these force is perpendicular to the smaller forces and has a magnitude of 8 N..If the smaller forces […]
A particle of mass m is projected with a velocity v making an angle of 45° with the horizontal.The magnitude of angular momentum of projectile about the point of projection when the particle is at […]
A ball is moving in a circular path of radius 5 m.If tangential acceleration at any instant is 10 m/s ² and the net acceleration makes an angle 30° with the centripetal acceleration, then the […]
A police jeep is chasing a culprit going on a motorbike.The motorbike crosses a turning at a speed of 72 km/h.The jeep follows it at a speed of 90 km/h,crossing the turning 10 s later […]
A 120 m long train is moving in a direction with speed 20 m/s.A train B moving with 30 m/s in the opposite direction and 130m long crosses the first train in a time
A piece of marble is projected from the earth’s surface with velocity of 50 m/s.2 s later, it just clears a wall 5m high.What is the angle of projection?
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(a) 45° (b) […]
A particle is moving such that its position coordinates (x,y) are (2 m,3 m) at time t=0,(6 m,7 m) at time t=2 s and (13 m,14 m) at time t=0 to t=5 s is
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