Physics
For a relation F = , to hold true, the condition(s) necessary is/are:
- velocities are equal to the velocity of light
- velocities are much smaller than the velocity of light
- mass remains constant
- both (b) and (c)
Laws of Motion
13 Likes
Answer
both (b) and (c)
Reason — It is observed that the mass of a particle increases with increase in velocity but it becomes perceptible only when the velocity v of the particle is comparable with the speed of light c. At velocities v << c, the change in mass is not perceptible. At such velocities (v << c ), mass m can be considered to be constant. Then Newton's second law takes the form F = = ma.
Thus, for F = = ma to hold true, two conditions are required :
- velocities are much smaller than the velocity of light
- mass remains constant.
Answered By
5 Likes
Related Questions
The force required to produce an acceleration of 5 ms-2 in a body of mass 2 kg is:
- 2.5 N
- 20 N
- 10 N
- 25 N
According to Newton's second law of motion, the change in momentum takes place in a direction :
- opposite to the direction of force applied
- perpendicular to the direction of the force applied
- similar to the direction of the force applied
- none of these
1 Newton is equal to :
- 103 dyne
- 108 dyne
- 1010 dyne
- 105 dyne
Two balls of masses 4m and 8m are in motion with velocities 2v and v respectively. The ratio of their momentum would be :
- 2 : 1
- 1 : 2
- 1 : 1
- 1 : 4