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KilaTsunami
October, 2024

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QUICK PHYSICS HELP

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french_fry
Posts: 4698 - Karma: 53
I need to find out how to do this, i got a test tommorow. Somebody help me please. You can just rearrange the equation without the numbers if you want.

A 5.0kg rock dropped near the surface of Mars reaches a speed of 15m/s in 4.0s. Mars has a radius of 3.38E6 m. What is the mass of Mars?
Feb 23 2006 1:05AM
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Melvs
Posts: 15174 - Karma: 480
acelleration = 15/4 and the units are m/s^2.

then there must be an equation comparing 'gravity' (what we just found) with the mass of a planet.

Click for larger image
Click for larger image


http://en.wikipedia.org/wiki/Gravitational_force

for more reference.
Feb 23 2006 1:13AM
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french_fry
Posts: 4698 - Karma: 53
allright thanks, i got it
Feb 23 2006 1:17AM
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thecoyote
Posts: 1937 - Karma: 14
OR us projectile motion formulas, and then the square law for gravity.
Feb 23 2006 2:43AM
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