Physics Test 20...

A large mass M moving with velocity v makes an elastic head-on collision with a small mass m at rest. What will be the expression for energy lost by mass M?

A body’s displacement in metres fluctuates as y = t² – t – 2 with time t in seconds. The displacement is zero for a value of t equal to

A mass 1 kg is suspended by a thread. It is

(i) lifted up with an acceleration 4.9 ms^–2.

(ii) lowered down with an acceleration 4.9 ms^–2. The ratio of tensions in the thread is

Four girls skating on circular ice ground of radius 200 m start from a point P on the edge of the ground and reach a point Q diametrically opposite to P following different paths as shown in figure. For which girl displacement is equal to the actual length of path?

A block of mass 'm' is slipping down a rough inclined plane with constant speed. The force on block by plane is -

What is the mass of a body that accelerates at a rate of 2.6 m/s² with a force of 90 N?

The speed of boat is 5 km/h in still water. It crosses a river of width 1 km along shortest possible path in 15 min. The velocity of river water is

A body starts off at rest and moves in a straight line with a constant acceleration. If its velocity is 8 m/s with a displacement of 32 m, its acceleration is

A bomb of mass 4 kg explodes in air into two pieces of masses 3 kg and 1 kg. The smaller mass goes at a speed of 90 m/s. The total energy imparted to two fragments is.