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thussain93
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Planet Orbits, finding radius HELPP!
The planet Mars has a mass of 6.418*1023kg and completes an orbit around the sun in 687 days. The sun has a mass of 1.99 * 1030kg. what is the average radius of the orbit of mars?
Force Gravity = G*(m1m2)/r2
Force Centripital = mv2/r
G = 6.67 * 10-11
I tried plugging in the numbers into the Universal gravitaiton formula where m1 was the mass of Mars * m2 which is the mass of the sun * Universal gravitation. I didn't know what to use as Force Gravity.
with the force centripital formula, you have 2 masses. how could i go about finding the velocity of Mars if i don't have the radius??
thanks for the help
Homework Statement
The planet Mars has a mass of 6.418*1023kg and completes an orbit around the sun in 687 days. The sun has a mass of 1.99 * 1030kg. what is the average radius of the orbit of mars?
Homework Equations
Force Gravity = G*(m1m2)/r2
Force Centripital = mv2/r
G = 6.67 * 10-11
The Attempt at a Solution
I tried plugging in the numbers into the Universal gravitaiton formula where m1 was the mass of Mars * m2 which is the mass of the sun * Universal gravitation. I didn't know what to use as Force Gravity.
with the force centripital formula, you have 2 masses. how could i go about finding the velocity of Mars if i don't have the radius??
thanks for the help