Laws Of Motion Question 270

Question: A satellite in force-free space sweeps stationary interplanetary dust at a rate $ dM/dt=\alpha v $ where M is the mass, v is the velocity of the satellite and $ \alpha $ is a constant. What is the deacceleration of the satellite[CBSE PMT 1994]

Options:

A) $ -2\alpha v^{2}/M $

B) $ -\alpha v^{2}/M $

C) $ +\alpha v^{2}/M $

D) $ -\alpha v^{2} $

Show Answer

Answer:

Correct Answer: C

Solution:

$ F=\frac{dp}{dt}=v\ ( \frac{dM}{dt} )=\alpha v^{2} $ $ a=\frac{F}{M}=\frac{\alpha v^{2}}{M} $



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