Posted by **Lindsay** on Sunday, December 16, 2007 at 12:26pm.

Suppose that the ratio of the Moon's mass to the Earth's mass is given by 1.200E-2 and that the ratio of the Moon's radius to the Earth's radius is given by 2.700E-1. Calculate the ratio of an astronaut's Moon-weight to Earth-weight.

Now it seems like this problem really shouldn't be too difficult. However, I'm not sure of how to solve it given ratios instead of the actual masses and radius's.

- Physics -
**tchrwill**, Sunday, December 16, 2007 at 1:38pm
Wm/We = gm/ge = (GMm/rm^2)/(GMe/re^2) or Mm(re^2)/Me(rm^2).

- Physics -
**Lindsay**, Sunday, December 16, 2007 at 2:17pm
Right. But w/o knowing the actual mass of the earth and moon, only the ratio, how can I do this?

- Physics -
**bobpursley**, Sunday, December 16, 2007 at 2:23pm
Lindsay, you are given Mm/Me, and rm/re

Wm/We= Mm/Me * (re/rm)^2

- Physics -
**Lindsay**, Sunday, December 16, 2007 at 2:24pm
Ohhh I see now! Sorry, I just wasn't understanding before.

Thanks. :)

## Answer this Question

## Related Questions

- Physics - I still cannot solve this problem: Consider a spaceship located on the...
- physics - can you walk me through this problem At what distance from teh Earth ...
- Physics - Consider a spaceship located on the Earth-Moon center line (i.e. a ...
- science - The moon is the earth's nearest neighbor in space the radius of the ...
- physics - The Moon's mass is 7.34 x 10^22 kg, and it is 3.8 x 10^8 away from ...
- physics - show that the weight of an object on moon is one-sixth of its weight ...
- physics - Suppose that the attraction between the moon and the earth were due to...
- Physics - A. Use the relation 2 m m m GM g R ƒ to find the acceleration due to ...
- Physics - The average distance separating Earth and the Moon (center to center) ...
- Science..physics - The moon is the Earth's nearest neighbour in space. The ...

More Related Questions