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प्रश्न
Nm is the unit of .......
एक शब्द/वाक्यांश उत्तर
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उत्तर
Work
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संबंधित प्रश्न
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
State the S.I. unit of energy.
What is the condition for a force to do work on a body?
How many watts equal one horse power?
Name the physical quantity which is associated with the work done by a body.
A body of mass 2 kg is moving with a speed of 20 ms-1. What is its K.E.?
An electric motor drives a machine which lifts a mass of 4 kg through a height of 10 m in 5 s at a constant speed. Assuming g = 10 ms-2, calculate
(i) the amount of work done, (ii) the power of the machine.
Find the kinetic energy of a car of mass 1000 kg traveling at 72 km/h.
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
