Physics
The mass of a body :
- changes with a change of place
- changes with direction
- changes when the velocity of the body is close to the velocity of light
- none of these
Laws of Motion
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Answer
changes when the velocity of the body is close to the velocity of light
Reason — The mass of a body increases with its velocity but this change is perceptible only when the velocity of the body v becomes more than 106 ms-1 i.e., reaches close to the speed of light c = (3 x 108 ms-1), so for a body moving with velocity less than 106 ms-1, its mass is taken to be constant.
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Related Questions
The relationship between weight and mass is :
- W = m
- W = mG
- W = mg
- m = Wg
The S.I. unit of weight is :
- kg
- Joule
- Newton
- dyne
Identify the correct statement from the following :
- Mass is a force and is measured in Newton.
- The weight of a body is the same everywhere in the universe.
- Mass remains constant, but weight changes with gravity.
- Weight is measured using a physical balance.
State Newton’s law of gravitation.