# Physics

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.

1. 👍 0
2. 👎 0
3. 👁 72
1. Wm/We = gm/ge = (GMm/rm^2)/(GMe/re^2) or Mm(re^2)/Me(rm^2).

1. 👍 0
2. 👎 0
2. Right. But w/o knowing the actual mass of the earth and moon, only the ratio, how can I do this?

1. 👍 0
2. 👎 0
posted by Lindsay
3. Lindsay, you are given Mm/Me, and rm/re

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

1. 👍 0
2. 👎 0
4. Ohhh I see now! Sorry, I just wasn't understanding before.
Thanks. :)

1. 👍 0
2. 👎 0
posted by Lindsay

## Similar Questions

1. ### Physics

Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft

asked by Lindsay on December 17, 2007
2. ### Physics

I still cannot solve this problem: Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body

asked by Lindsay on December 17, 2007
3. ### physics

Suppose that the attraction between the moon and the earth were due to Coulomb forces rather than gravitational force. What would be the magnitude of the charge required if equal but opposite charges resided on both earth and

asked by Andy on January 19, 2010
4. ### PHYSICSS!!!

still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at

asked by Rory still need help damon and others on December 26, 2007
5. ### PHYSICS

Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft

asked by Courtney hey damon can i get the quadratic on this on January 9, 2008
6. ### physics hey damon one more please! =]

Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft

asked by Jon on January 14, 2008
7. ### physics

still cant get this one? so damon i know you wanna help! or anyone else im open for suggestions haha Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at

asked by rory on December 21, 2007
8. ### Physics

Consider a spaceship located on the Earth-Moon center line (i.e. a line that intersects the centers of both bodies) such that, at that point, the tugs on the spaceship from each celestial body exactly cancel, leaving the craft

asked by Lindsay on December 16, 2007
9. ### Physics

Many astronomers argue that the Earth and Moon should be considered a double planet,since the gravitational force by the sun on the Moon is approximately as big as that by the Earth on the moon.Using the data below for the Earth

asked by Abdurhman on January 21, 2017
10. ### Astronomy

The Moon’s gravity stretches Earth, which causes Earth’s tides. How much stronger is the force of the Moon’s gravity on a 1 kg mass on the side of Earth closest to the Moon compared to the force of the Moon’s gravity on a

asked by hannah on November 18, 2018

More Similar Questions