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प्रश्न
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
उत्तर
(i) Potential energy
(ii) Heat energy
(iii) Potential energy
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
Express joule in terms of erg.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.
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?
When you move upstairs, do you perform some work?
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Give an example
Light energy changes to electrical energy.
How is horse power related to the S. I. unit of power?
One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance ______ work will be done.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
