Homework Help: Astronomy

Posted by Rebecca on Saturday, October 1, 2011 at 11:24pm.

Suppose that you travel to a planet that has 4 times the Earth's mass and 4 times the
Earth's radius. Calculate how much more or less you would weigh on this planet
compared to your weight on Earth. Express your answer as a factor or fraction of
your weight on Earth. Show all work.

Astronomy - drwls, Sunday, October 2, 2011 at 7:39am
weight W = M g

g , and the weight, are proportional to M/R^2

M/R^2 is 4Me/(16 Re^2) = (1/4) Me/Re^2
on the new planet.
Me = earth mass
Re = earth radius

Weight will be four times less on the new planet
Astronomy - clarification - drwls, Sunday, October 2, 2011 at 10:44am
The "M" in the first equation is the object mass, not the earth mass. I should have used m.

The answer is the same

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