# Law of mass attraction

#### bigman8424

anyone wanna check my work, i would greatly appriciate it:

the quest. asks you to find law of mass attraction to calculate force of gravational of jupiter towards sun:
used formula:

F = GMm/R2 = (6.67e-11)(1.99e30)(1.90e27)/(7.78e6)2
FJupiter = 4.17e33 Newtons ??

Then it asks centripetal force towards sun using law of dynamics??

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#### dextercioby

Homework Helper
Gravity attraction force IS a centripetal force.

You may wanna check the distance (in "m") (actually the average between the major & the minor semiaxis) between the 2 celestial bodies.

Daniel.

#### Chris Danger

bigman8424 said:
...using law of dynamics??
this may suggest having to use $a_{n} = \frac{v^2}{r}$ to get acceleration, but you would need the velocity and the mass (to get the force from $F = ma$)

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