Consider an expanding sphere of instantaneous radius R whose total mass remains constant. The expansion is such that the instantaneous density ρ remains uniform throughout the volume. The rate of fractional change in density 
is constant. The velocity v of any point on the surface of the expanding sphere is proportional to
A
R 3
B
R
C
R 2/3
D
Text Solution
Verified by ExpertsThe correct answer is:
B
Sol. m = 
0 = 0 + 
⇒ 
v ∝ R
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