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संबंधित प्रश्न
When is work said to be done by a force?
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
Name the forms of energy which a wound-up watch spring possesses.
What is the condition for a force to do work on a body?
What are the quantities on which the amount of work done depends? How are they related to work?
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
The work done on an object does not depend on the :
How many watts equal one horse power?
Is the motion of moon around the earth in circular path an accelerated motion?
How many joules are there in 1 mega joule?
A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?
List any six forms of energy and write a short note on each of them.
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
How much energy is gained by a box of mass 20 kg when a man, runs carrying the box with a speed of 3 m/s-1 to catch the bus?
Can two agents, doing the same work, have different power?
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
