Advertisements
Advertisements
प्रश्न
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
उत्तर
Force = m × g = 5 × 9.8 = 49 N; Distance = 10 m
∴ Work done = F × d = 49 × 10 = 490 J.
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
State the S.I. unit of work and define it.
State the S.I. unit of energy.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
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)
State two disadvantages of producing hydroelectricity.
Fill in the blank with suitable word :
The work done on a body moving in a circular path is __________
What are the quantities on which the amount of work done depends? How are they related to work?
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Fill in the boxe to show the corresponding energy transformation.
Name two places in India where electricity is generated from nuclear power plants.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
