# Find accel. of g on Saturns Moon.

1. Jul 16, 2008

### Lance WIlliam

]1. The problem statement, all variables and given/known data[/b]

Calculate the gravitational acceleration at the surface of (a) Mercury and (b) Saturn's moon Titan?

Ive found A by using: F=GMm/r^2

a=Gm/r^2

But how do I find saturns moon titan....All i know is saturn mass which is 5.69e26 and radius6.03e7 of staurn, plus orbit radius 1.43e12

these are not given in the problem I have a chart with the main planets info.
I thought i could just use saturns radius plus orbitsal radius for "r" and use that...but it didnt work.

2. Jul 16, 2008

### Kurdt

Staff Emeritus
Last edited by a moderator: Apr 23, 2017
3. Jul 16, 2008

### Lance WIlliam

Thankyou ,
but that does give me the Acceleration of G on the Titan.
example: earths its 9.81m/s^2
? m/s^2

What should I use for "r" Do I add saturns radius plus What..? Do I need the distance titan is from saturn?

4. Jul 16, 2008

### Kurdt

Staff Emeritus
You use the radius of Titan. I'd ignore Saturn unless you've been specifically told to include it.

5. Jul 16, 2008

### Lance WIlliam

Re: Mars orbit around the Sun

ok I did

a=((6.67259e-11)(1.35e23))/(2.57e3)^2

I get 1.35e6 which is way to big for m/s^2 accel.

6. Jul 16, 2008

### Kurdt

Staff Emeritus
You've left the radius in kilometers not meters.

7. Jul 16, 2008

### Lance WIlliam

SHouldnt accel. be a number like 3.5ms/^2 not (a number)e6 or 9 ...it should be alot smaller?

8. Jul 16, 2008

### Kurdt

Staff Emeritus
it will be if you use the correct units for the radius.