The picture shows two exoplanets, b and c. The mass and radius of each planet is given in terms of M and r. What is the surface gravity on planet-c if the surface gravity on planet-b is 4 m/s2?
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q ′
R 2
G M
=
(4ve) 2
G×2me
=
8
1
v e 2
G m e
=
8
g
To find4times the acceleration due to gravity
=
4×
8
1
g=
2
g
=
2
10
= 5m/s
2
Hence, the answer is 5m/s
2
.
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