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प्रश्न
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उत्तर
Kinetic energy of a body depends upon:
(i) Mass of the body
(ii) Speed of the body
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संबंधित प्रश्न
Write the expression for work done by a force.
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Why does a spanner have a long handle?
Complete the following sentences:
1 H.P. = ........ W.
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]
