Satellite orbital speed:

$\overline{){\mathbf{v}}{\mathbf{=}}\sqrt{\frac{\mathbf{G}{\mathbf{m}}_{\mathbf{e}}}{\mathbf{r}}}}$

m_{e} is the mass of the earth and r is the radius.

Two satellites orbit the Earth in circular orbits of the same radius. One satellite is twice as massive as the other. Which statement is true about the speeds of these satellites?

(a) The heavier satellite moves twice as fast as the lighter one.

(b) The two satellites have the same speed.

(c) The lighter satellite moves twice as fast as the heavier one.

(d) The ratio of their speeds depends on the orbital radius.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

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