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संबंधित प्रश्न
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
Define 'joule'.
Give an example
Chemical energy changes to electrical energy.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
What is the difference between renewable and non-renewable resources?
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
A water pump raises 50 kg of water through a height of 25 m in 5s. Calculate the power supplied by the pump (Take: g = 10 N kg−1).
