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प्रश्न
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उत्तर
Work
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संबंधित प्रश्न
An electron emitter must have _____________ work function and ___________ melting point.
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 body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
State two advantage of producing hydroelectricity.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
Is power a scalar or a vector quantity?
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 car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
