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Delilah



Joined: 29 Mar 2010
Posts: 6
Location: Whiteville

PostPosted: Wed Mar 31, 2010 1:37 am    Post subject: Help Physics! Reply with quote

Compute the gravitational acceleration on the moon and on Mars, given the data shown below. gmoon = ____________m/s2
gMars =_____________ m/s2

mmoon = 0.0123mearth
mMars = 0.107mearth
Rmoon = 0.272Rearth
RMars = 0.530Rearth
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hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 125

PostPosted: Wed Mar 31, 2010 9:43 am    Post subject: Reply with quote

For this problem you just need to substitute the information into the Newton's equation for gravitational force between two objects.
F = (G M m)/R^2
but F = mg
therefore,
g = G M/R^2

Where G is the universal gravitational constant (6.67300 10-11 m3 kg-1 s-2). M is the mass of the planet multiplied by the mass of the Earth and R is the radius multiplied by the radius of the Earth.

m_Earth = 5.9742 10E+24
r_Earth = 6 378.1 km = 6.3781 E+6

As I have said before, I am happy to help but I am not here to do your homework for you. Please do not just post your homework problems without explaining what you have tried or why you are stuck.
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