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प्रश्न
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उत्तर
K.E ,K = `1/2` mv²
If mass is increased four times
K.E ,K' = `1/2` (4m) (v)²
or K' = 4 x `1/2`mv²
to maintain the same kinetic energy the velocity should be made half.
Then, K" = 4 x `1/2` m `("v"/2)²` = K
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संबंधित प्रश्न
State two conditions when no work is done by a force.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
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 force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Complete the following sentences:
1 H.P. = ........ W.
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
What should be the characteristic of a source of energy?
The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
