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प्रश्न
Is work done a scalar or a vector physical quantity?
उत्तर
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction.
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संबंधित प्रश्न
Define 1 J of work.
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
An electron emitter must have _____________ work function and ___________ melting point.
A coolie does no work against the force of gravity while carrying a luggage on a road.
State the S.I. unit of work and define it.
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
What are the quantities on which the amount of work done depends? How are they related to work?
Nm is the unit of .......
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
A ______ should act on an object.
A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
