EASY
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What should the angle be between force F and displacement S in order for work done to be zero?

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Important Questions on Work, Power and Energy

MEDIUM
Derive a relationship between SI and CGS units of work.
EASY
Heat and work done by the heat was discovered by
EASY
Spring constant of a spring is K = 6 ×103 N/m. Work done to stretch it 10-2 m from mean position is
MEDIUM
A body is displaced by 10 m when maximum work of 200 joules is done on it. Calculate the force acting on this body.
HARD

A force is applied upon a body of 40 kg then its velocity increases from 1
metre/second to 2 metre/second. Determine work done by the force.

HARD
An object of 40 kg mass is moving with 5 m/s velocity. Now force is applied on the object such that its velocity increases to 10 m/s. Calculate the work done by the force.
EASY
A force of 40 N acts on a body, and body moves through a distance of 2 metre at an angle of 45° in the direction of the force. The work done by the force is 
EASY
Convert 1 kilowatt-hour into joules.
HARD
A pump on the ground floor of a building can pump up water to fill the tank of 30 m3 in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, the power consumed by the pump is g=10 m/s2
EASY
When does a force perform work ?
MEDIUM
When a coil spring is compressed, the work is done on the spring. The elastic potential energy .....
EASY
What is the amount of work done on a body of mass 10 g moving in a circular path of radius 5 cm?
MEDIUM

A heater coil connected to a supply of a 220 V is dissipating some power \( P_1 \) . The coil is cut into half and the two halves are connected in parallel. The heater now dissipates a power \( P_2 \). Find the ratio of power \( P_1 \) : \( P_2 \).

EASY
The work done when the earth moves around the sun is
HARD
A porter lifts the luggage weighing 5 kg from the ground and puts on the head. Then, he stands still for some time. How much work he is doing while holding the luggage on his head and standing still?
MEDIUM
What should be the angle between force and displacement to get maximum work?
EASY
"Energy can neither be created nor be destroyed", which law is this?
EASY
When a body falls freely, _____.
EASY

Which of the following is not the unit of work?