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प्रश्न
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
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उत्तर
Energy is defined as the capacity of a body to do work. Energy is a scalar quantity. The energy possessed by a body is measured by the amount of work done by a body while changing its state of rest or state of motion.
संबंधित प्रश्न
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
The work done on an object does not depend on the :
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
