A monkey is descending from the branch of a tree with constant acceleration. If the breaking strength is 75% of the weight of the monkey, the minimum acceleration with which monkey can slide down without breaking branch is

A 0.5 kg ball moving with a speed of 12 m/s strikes a hard wall at an angle of 30⁰ with the wall. It is reflected with the same speed at the same angle. If the ball is in contact with the wall for 0.25 second, the average force acting on the wall is

When a bullet of mass 5kg is fired, the impulse on it is 200Ns. If the mass of the gun is 10kg, then the recoil velocity of the gun is

A block is lying static on the floor.The maximum value of static frictional force on the block is 10 N.If a horizontal force of 8 N is applied to the block,what will be the frictional force on the block ?

A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is

The maximum speed with which a car can be driven round a curve of raidus 18 m without skidding (when g=10m/s²) and the coefficient of friction between rubber tyres and the roadway is 0.2 is

A body of mass 2 kg ,moving on a horizontal surface with an initial velocity of 4 m/s , comes to rest after 2s.If one wants to keep this moving on the same surface with a velocity of 4 m/s,the force required is

A passenger in the bus finds that his suit case suddenly starts sliding backwards. This means that the bus is

The upper half of an inclined plane of inclination θ is perfectly smooth while the lower is rough.A body starting from rest at the top comes back to rest at the bottom,if the coeffecient of friction for the lower half is given by

If the force on a rocket, moving with a velocity of 300 m/s is 210 N, then the rate of combustion of the fuel is