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प्रश्न
Name the physical quantity whose SI unit is Nm.
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उत्तर
Torque
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संबंधित प्रश्न
State two factors on which the work done on a body depends.
State the law of conservation of energy.
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?
Each of the following statement describes a force acting. Which force is causing work to be done?
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
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.
What is work?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A wind-mill is lifting water from a well.
