Question Library

Under which conditions is work done

The energy in a moving car is an example of

Using the diagram above, the effective force pushing it forward at an angle 60º is

A body of mass, m is projected vertically upward with a velocity, y. At what position will the potential energy be maximum?

How much net work is required to accelerate a 1200 kg car from 10\(ms^{-1}\) to 15\(ms^{-1}\)

How much work is done against the gravitational force on a 3.0 kg object when it is carried from the ground floor to the roof of a building, a vertical climb of 240 m?

The joule is equivalent to?

A train of mass 1600 kg attains a speed of 25 ms\(^{-1}\) in 20 seconds. The power developed in the engine is?

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms\(^{-1}\) from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms\(^{-2}\))

A man weighing 200 N runs up a staircase in 5s. If the height of the staircase is 9 m, calculate the power of the man.

If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended? [g = 10 m\s\(^2\)]

An object of mass 80 kg is pulled on a horizontal rough ground by a force of 500 N. Find the coefficient of static friction. [g = 10 ms\(^{-2}\)]

A ball is dropped and it hits the floor at a point A. It rebounds upward to a point B. While moving from A to B its?

A force F is applied to a body P as shown in the diagram above. If the body moves through a distance, a, which of the following represents the work done?

A gas with initial volume of 2 X 10\(^{-6}m^3\) is allowed to expand to six times its initial value at constant pressure of 2 x 10\(^5Nm^{-2}\). The work done is?