- #1
karis
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Homework Statement
A low-altitude satellite near the Earth's surface has a speed of 7.90 km s-1. The radius of the Earth is about 4 times that of the moon and the ratio of the average density of the Earth to that of the moon is about 5:4. The speed of a low-altitde satellite near the moon's surface would be
A. 1.77km s-1
B. 2.21km s-1
C. 2.47km s-1
D. 3.57km s-1
E. 4.42km s-1
Homework Equations
v2 = GM/r
The Attempt at a Solution
i got the ans of 3.12km s-1
the ratio of the mass of Earth to moon would be 80:1
n the ratio of radius of Earth to moon is 4:1
so i guess it's 7.92/20 ?
Pls help, i don't know what i did wrong :(
Thz so much