- #1
mutineer123
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Homework Statement
The mean diameters of Mars and Earth are 6.9 10^3 km and 1.3 10^4 km, respectively.?
The mass of Mars is 0.11 times Earth's mass.
(a) What is the ratio of the mean density of Mars to that of Earth?
(b) What is the value of the gravitational acceleration on Mars?
(c) What is the escape speed on Mars?
Homework Equations
The Attempt at a Solution
I got 1 and 2, but am stuck in 3. ANSWER 1 is 0.74, ANSWER 2 is 3.8m/s^2.
For The escape speed on Mars, I am not sure if I entirely understand this question even! One of my friends told me that escape speed is when
1/2 m v^2 > mgh. And using this method I am getting the right answer, but his definition of escape speed is not entirely satisfying. You know the formula a=v^2/r right? Why can't we use that to get V here?? Also, is there a way of finding out the answer using formulas like g=Gm/r^2 ?