Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient μ.If the first block with surface area A experience a frictional force f, then the second block with surface area 2A will experience a frictional force

To avoid slipping while walking on ice one should take smallest steps because of the

A balloon contains 10 g of air. The air begins to escape from a small hole in the balloon at the rate of 4 cms^-1 and it completely shrinks in 2 seconds. What is the average force on the balloon?

A shell is fired from a canon, it explodes in mid air, its total 

A cricket player catches a ball of mass 100 g and moving with a velocity of 25 ms^-1. If the ball is caught in 0.1s, the force of the blow exerted on the hand of the player is

A disc revolves in a horizontal plane at a sready rate of 3 r.p.s.A coin will remain on the disc if it is kept at a distance of 2 cm from the axis of rotation.What is the coeffecient of friction between the coin and the disc? g = 9.8 m/s²

A block of mass 10 kg is placed on a rough horizontal surface whose coefficient of friction is 0.5.If a horizontal force of 100 N is applied on it,then acceleration of block will be :

A man slides down a light rope whose breaking strength is η times his weight .What should be his maximum acceleration so that the rope does not break ?

A machine gun has a mass of 10 kg.It fires 30 g bullets at the rate of 6 bullets per second with a speed of 400 m/s.What force must be applied to the gun to keep it in position ?

A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s.The man holding it can exert a maximum force of 144 N on the gun.How many bullets can he fire per second at the most ?