A liquid drop of mass 1 g falls from a cliff 1 km high. It hits the ground at the bottom of the cliff with a speed of `50 m//s`. What is the work done by the unknown resistive force?

Consider a drop of rain water having mass 1 g falling from a height of 1 km . It hits the ground with a speed of 50 m//s Take g constant with a volume 10 m//s^(2) . The work done by the (i) gravitational force and the (ii) resistive force of air is :

A machine gun has a mass 5 kg. It fires 50 gram bullets at the rate of 30 bullets per minute at a speed of 400" m s"^(-1) . What force is required to keep the gun in positon ?

A body of mass 1 kg , initially at rest, explodes and breaks into three fragments of masses in the ratio 1:1:3 . The two pieces of equal mass fly off perpendicular to each other with a speed of 30 m//s each. What is the velocity of the heavier fragment?

An iron ball of mass 3 kg is released from a height of 125 m and falls freely to the ground. Assuming that the value of g is 10 m//s^(2) , calculate time taken by the ball to reach the ground

Solve the following examples / numerical problems: An iron ball of mass 3 kg is released from a height of 125 m and falls freely to the ground. Assuming that the value of g is 10 m/s^2, calculate (a) the time taken by the ball to reach the ground (b) the velocity of the ball on reaching the ground.

A small sphere of mass m is dropped from a height After it has fallen 100 m it has attained its terminal velocity and continues to fall at that speed. The work done by air friction against the sphere during the first 100 m of fall is-

An object of mass 50 g moves uniformly along a circular orbit with an angular speed of 5 rad/s. If the linear speed of the particle is 25 m/s, what is the radius of the circle? Calculate the centripetal force acting on the particle.

An object of mass 5kg falls from rest through a verticle distance of 20m and reaches a velocity of 10ms^-1 . How much work is done by the push of the air on the object? (g = 10 ms^2)

An iron ball of mass of 3 kg is released from height of 125 m and falls freely to the fround Assuming that the vlaue of g is 10m//s^2 ,calculate: (i)time taken by the ball to reach the ground.

A man drops a 20 kg object from the top of a 10m high building . What will be the velocity of the object when it just hits the ground?