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Physics
Physics
Problem
The escape speed from planet X is
v
e
s
c
v_{esc}
v
esc
. Planet Y has twice the density and half the radius of planet X. What is the speed required to escape the gravitational field of planet Y? A.
v
e
s
c
4
\frac{v_{esc}}{4}
4
v
esc
B.
v
e
s
c
2
\frac{v_{esc}}{2}
2
v
esc
C.
v
e
s
c
2
2
\frac{v_{esc}\sqrt{2}}{2}
2
v
esc
2
D.
v
e
s
c
2
v_{esc}\sqrt{2}
v
esc
2
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