Work Power And Energy
A body starts from rest and moves with uniform acceleration. What is the ratio of kinetic energies at the end of 1st,2nd and 3rd seconds of its journey ?
The spring block system lies on a smooth horizontal surface. The free endof the spring is being pulled towards right with constant speed v0=2m/s. At t=0sec, the spring of constant k=100N/cm is unsttretched and the block has a speed 1m/s to left. The maximum extension of the spring is.
A projectile is fixed on a horizontal ground. Coefficient of restitution between the projectile and the ground is 'e'. If a,b and c be the ration of time of flight [T2T1], maximum height [H2H1] and horizontal range [R2R1] in first two collisions with the ground, then
A ball is released from point A as shown in figure. The ball leaves the track at B. All surfaces are smooth.
If track makes an angle 30∘ with horizontal at B, then maximum height attained by ball will be
The length of ballistic pendulum is 1m and mass of its block is 0.98kg. A bullet of mass 20 gram strikes the block along horizontal direction and gets embedded in the block. If block + bullet completes vertical circle of radius 1m, then the striking velocity of bullet is
A rubber ball drops from a height 'h'. After rebounding twice from the ground, it rises to h/2. The co-efficient of restitution is
A ball of mass 'm' moving with a horizontal velocity 'v' strikes the bob of mass 'm' of a pendulum at rest. During this collision, the ball sticks with the bob of the pendulum. The height to which the combined mass raises is (g = acceleration due to gravity).
A 1kg ball moving at 12m/s collides head on with a 2g ball moving in the opposite direction at 24m/s. The velocity of each ball after the impact, if the coefficient of restitution is 2/3 is