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Gravity on mass on earth's surface vs sunearth gravity 
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#1
Apr2705, 11:39 PM

P: 75

Q:
A mass of 5.000 kg is sitting on the Earth's surface directly under the sun during a solar eclipse. The sun exerts a gravitational force with magnitude Fs on the mass. The moon's gravitational force on the mass has magnitude Fm. Calculate the ratio Fs / Fm. This problem is really frustrating me. For the object, wouldnt Fm be mg = 5*9.8? Then wouldnt the Fs be (mass of the sun)(mass of earth)/R^2 ? So wouldnt it be the Fs divided by Fm? Please help!?!?! 


#2
Apr2705, 11:47 PM

Sci Advisor
HW Helper
P: 3,033

You are being asked to calculate the ratio of the forces of attraction to the sun and to the moon for a mass that is at the surface of the earth. You are not asked for the force of attraction to the earth.



#3
Apr2705, 11:50 PM

P: 75

HAH wow i'm embarassed... thanks



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