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प्रश्न
Give an example
Chemical energy changes to heat energy.
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उत्तर
Candle flame
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संबंधित प्रश्न
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
Give reasons for the following. No work is done if a man is pushing against a wall.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
State the SI unit of work.
Each of the following statement describes a force acting. Which force is causing work to be done?
Define 'joule'.
Complete the following sentences:
Joule is the unit of .......
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
