Homework Help: physics please help :)

Posted by Anonymous on Tuesday, December 8, 2009 at 11:57pm.

a.the gravitational force between 2 electrons 1.00m apart is 5.42x10^-71 N. Find the mass of an electron.

b.2 spherical balls are placed so their centres are 2.6m apart. The force between the balls is 2.75x10^-12N. What is the mass of each ball if one ball is twice the mass of the other ball?

physics please help :) - drwls, Wednesday, December 9, 2009 at 12:37am
(a) Solve F = 5.42x10^-71 N = G*m^2/(1)^2
m is the electron mass and g is the universal cnstant of gravity.
That equatiuon can be solved for m.

(b) Let the ball masses be M and 2M
F = 2.75x10^-12N = G*(2M^2)/(2.6)^2
Solve for M

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