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प्रश्न
Fill in the boxe to show the corresponding energy transformation.
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उत्तर
Electrical energy ⇌ Heat energy
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
State two advantage of producing hydroelectricity.
Is power a scalar quantity?
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 girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
