Martian's Weight on Mars Calculated

[AmericanBoy]

Homework Statement

On Mars, a martian tells you he has 35.0kg of mass. What is his weight on mars?

Mars Info:
Mass= 6.42x10^23
Radius= 3.40x10^6
Radius of Orbit about sun= 2.30x10^11

Homework Equations

FG=GM1M2/R^2

The Attempt at a Solution

I tried using the equation above, but i got 4.28x10^13. I am pretty sure you have to find Gravity on Mars and multiply it with the martians mass because mass to weight on Earth is mass(kg) x 9.8 m/s^2 (Gravity on Earth)(Hopefully this is a better format than my last thread.

 

[AmericanBoy]

Btw, please show how you got the answer.

 

[haruspex]

it sounds like you forgot to multiply by G.. please post all working.

 

[AmericanBoy]

That's the problem. How do you find G on Mars?

 

[haruspex]

That's the problem. How do you find G on Mars?

G is a universal constant (not to be confused with g).

 

[CheesyPeeps]

If you have a data sheet, the gravitational field strengths for various planets may be given. This would allow you to use W=mg.

 

[haruspex]

If you have a data sheet, the gravitational field strengths for various planets may be given. This would allow you to use W=mg.

I'm sure AmericanBoy is supposed to use the information about Mars provided.

 

[Chestermiller]

If you have a data sheet, the gravitational field strengths for various planets may be given. This would allow you to use W=mg.

How would information like this help the OP who is trying to learn the fundamentals?

Chet

 

[member 529879]

It looks like you have the correct formula, you just plug everything into get the final answer. (6.67 x 10^-11N·(m/kg)^2)(35kg)(6.42 x 10^23kg) / (3.4 x 10^6m)^2.