Please select a subject first
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A body does 20 J of work in 10 s. What is its power?
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Name the physical quantity associated with the 'rate of doing work'.
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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.
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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?
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If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?
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A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
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Name the CGS unit of work.
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A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
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Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
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A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
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When an elevator starts to move down suddenly we experience 'weightlessness'. Explain.
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