# Finding the mass of the Earth.

1. Jan 17, 2005

### Bissli

My class was given an assignment to design an experiment where we could determine the mass of the Earth, using the equipment found in our lab. (basic highschool stuff) I know we use gravitation pull in some way, towards the sun (?) but all the research i've done and explanations i've found, i'm having a hard time understanding. Any help would be great, thanks.

2. Jan 17, 2005

### vincentchan

are you allowed to use the gravitational constant G?

3. Jan 17, 2005

### dextercioby

Not only G,he should use the mean Earth radius as well...I think this is more a theoretical problem.After all,in the lab u could come up only with "g"...Maybe a Foucault pendulum would be useful as well...

Daniel.

4. Jan 17, 2005

### vincentchan

He can find earth's radius using the ancient greek method... measuring the shadow of two sticks far away.... cell phone and auto mobile make this experiment doable.... but i don't think it is possible to find G in a highschool lab...

5. Jan 18, 2005

### Bissli

i think we are allowed to use the constant, at least i am, and could someone please explain how a pendelum would help?

6. Jan 18, 2005

### futb0l

A pendulum's oscillation depends on the gravitational acceleration.