Advertisements
Advertisements
Question
What happens to the K.E. when
(i) the mass of the body is doubled at a constant velocity and
(ii) the velocity of the body is doubled at constant mass?
Advertisements
Solution
We have, K.E. = 1/2 mv2
Hence,
(i) On doubling the mass, at a constant velocity, the K.E. becomes double its original value.
(ii) On doubling the velocity, at constant mass, the K.E. becomes (2)2 i.e., 4 times its original value.
RELATED QUESTIONS
Give one relevant example for the following transformation of energy:
Electrical energy to heat energy.
State different forms of potential energy and give one example of each.
What do you understand by the kinetic energy of a body?
What is geo thermal energy? Explain in brief.
Renewable source of energy is:
Give three examples of bodies possessing kinetic energy.
Write the type of energy possessed in the following case:
A wound-up spring
Give one example when:
Kinetic energy changes to heat energy.
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
