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प्रश्न
State the energy changes which take place when A toy car with a wound spring moves on ground.
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उत्तर
P.E (Wound spring) to K.E. (motion)
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संबंधित प्रश्न
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
What is the work done by the moon when it revolves around the earth?
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A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
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How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
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(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.
