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    shawnc21's Avatar
    shawnc21 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Nov 5, 2007, 06:37 PM
    Calculations Involving the Force of Gravity
    What is the distance between the Moon and Earth if the mass of the Moon is 7.34 X 10^22kg, and the force of attraction between the two is 2.00 X 10^20 N?

    - the answer is 3.83 X 10^8 kg.

    I just want to know how to get there
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
    Junior Member
    		  
    #2

    Nov 5, 2007, 10:06 PM
    If masses of Earth and moon are M1 and M2 (kg), and r is distance in meters

    Force between them is G M1 M2/r^2

    Where G is the Gravitation Constant, approx = 6.673 10^-11 (N m^2 Kg^-2)

    I hope you find the above helpful.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
    Uber Member
    		  
    #3

    Nov 6, 2007, 01:33 AM
    Well there's some problem here, you're looking for a distance, but you say the answer is in kilograms?

    You need to have another look.
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