Physics
Grade-8
Easy
Question
Identify the formula to calculate the force in a variable mass constant velocity system.
- F = m/t
- F = mv
- F = ma
- F = v(dm/dt)
Hint:
F= v(dm/dt) + m(dv/dt)
The correct answer is: F = v(dm/dt)
- F= v(dm/dt)+m(dv/dt)
- dm/dt can be also written as a .
- Hence, F = v(dm/dt) is for variable mass system.
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