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प्रश्न
When you move upstairs, do you perform some work?
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उत्तर
Yes, we perform work against gravity.
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संबंधित प्रश्न
The S.I. unit of work is
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
How many watts equal one horse power?
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
Why is the work done on an object moving with uniform circular motion zero?
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.
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
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]
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
