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प्रश्न
उत्तर
Examples of kinetic energy:
(i) Air in motion has kinetic energy.
(ii) A swinging pendulum
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संबंधित प्रश्न
Define 1 J of work.
Write the expression for work done by a force.
State two factors on which the work done on a body depends.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
What are the units of (a) work, and (b) energy?
Explain by an example that a body may possess energy even when it is not in motion.
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.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Does the earth move around the sun with a uniform velocity?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
Name the material commonly used for the manufacturing of solar cells.
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 proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.
