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प्रश्न
Work is said to be done by a forte only when ................
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उत्तर
Work is said to be done by a forte only when the body moves.
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संबंधित प्रश्न
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
Each of the following statement describes a force acting. Which force is causing work to be done?
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
Give an example
Electrical energy changes to heat energy.
What should be the characteristic of a source of energy?
What are the advantages and disadvantages of using solar cells for producing electricity?
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]
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
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)
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
