Work, Energy and Power
Work done by force, kinetic and potential energy, conservation, power.
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Take a full mock →Q1 · Work, Energy and Power · EASY
A porter lifts a luggage of 20 kg from the ground and puts it on his head 1.5 m above the ground. He then walks 50 m on a horizontal platform. Calculate the total work done by the porter against gravity. (Take g = 10 m/s²)
Q2 · Work, Energy and Power · MEDIUM
A ball of mass 0.5 kg is dropped from a height of 10 m. After striking the ground, it bounces back to a height of 6 m. How much energy is lost during the collision with the ground? (Take g = 10 m/s²)
Q3 · Work, Energy and Power · HARD
A pump is required to lift 600 kg of water per minute from a well 20 m deep and eject it with a speed of 10 m/s. Calculate the power required by the pump. (Take g = 10 m/s²)
Q4 · Work, Energy and Power · MEDIUM
A machine does 2400 J of work in 30 seconds. What is the power of the machine?
Q5 · Work, Energy and Power · MEDIUM
A force of 20 N displaces an object by 5 m at an angle of 60° to the direction of force. How much work is done?