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Delilah
Joined: 29 Mar 2010 Posts: 6 Location: Whiteville

Posted: Wed Mar 31, 2010 1:37 am Post subject: Help Physics! 


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

Posted: Wed Mar 31, 2010 9:43 am Post subject: 


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 × 1011 m3 kg1 s2). 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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