Well to start you want to find Fg. m1 is given, and m2 is the mass of the earth, so you can substitute all that into the equation and you'll get Fg. Btw isn't the rule Fg = Gm1m2/r^2? I might be wrong on the rule, it's been a long time since I took this stuff but you might want to double check it
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Homework Statement
A uniform line charge with linear charge density = 6nC/m is situated coincident with the x-axis. Find the electric flux per unit length of line passing through a plane strip extending in the x direction with edges at y=1, z=0, and y=1, z=5.
The final answer...