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Physics
Physics
Problem
Planets X and Y are uniform spheres of the same density. The radius of X is twice the radius of Y. If
v
X
v_X
v
X
and
v
Y
v_Y
v
Y
are the escape velocities from their surfaces respectively, what is the ratio
v
X
:
v
Y
v_X : v_Y
v
X
:
v
Y
? a)
2
:
1
\sqrt{2} : 1
2
:
1
b)
2
:
1
2 : 1
2
:
1
c)
1
:
2
1 : \sqrt{2}
1
:
2
d)
4
:
1
4 : 1
4
:
1
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