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प्रश्न
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
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उत्तर
Joule is the unit of work and energy.
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संबंधित प्रश्न
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
An electron emitter must have _____________ work function and ___________ melting point.
Derive a relationship between S.I. and C.C.S. unit of work
Work done = Force × ........................................
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 water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
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?
What is the SI unit of work?
(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.
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Give an example
Electrical energy changes of sound energy.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
________ is said to be done when a force is acting on it.
What is work?
