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Gravitation question - rep given
Two small spheres of mass 4kg and Mkg are placed 80cm apart. If the gravitation force is zero at a point 20cm from the 4kg mass along the line between the two masses. Calculate the value of M.
Reply 1
17
Gravitational field strength at a point x, F = Gm1/x2 - Gm2/(0.8-x)2
Set F=0 for the neutral point, xn
Gm1/xn2 = Gm2/(0.8-xn)2
Cancel the G's, and put in the numbers given with xn=0.2...
4/(0.2)2 = M/(0.6)2
M = 4*(0.6)2/(0.2)2
M = 36kg
Set F=0 for the neutral point, xn
Gm1/xn2 = Gm2/(0.8-xn)2
Cancel the G's, and put in the numbers given with xn=0.2...
4/(0.2)2 = M/(0.6)2
M = 4*(0.6)2/(0.2)2
M = 36kg
Reply 2
swifty
OP
Thank you very much for working this out for me! I know what I've done wrong I did this:
4mg / 0.2 ^2 - 4mg / 0.6 ^2 = 0
Which makes no sense at the end.....
4mg / 0.2 ^2 - 4mg / 0.6 ^2 = 0
Which makes no sense at the end.....
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