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प्रश्न
Give an example
Electrical energy changes of sound energy.
एक शब्द/वाक्यांश उत्तर
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उत्तर
Electric bell
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संबंधित प्रश्न
When is work said to be done by a force?
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
Define 'joule'.
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?
What change should be effected in the velocity of a body to maintain the same K.E., if its mass is increased four times?
What is the amount of energy spent by the heart in pumping blood through the body?
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.
Name the CGS unit of work.
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
Give an example
Light energy changes to electrical energy.
