- #1
strawberrysk8
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Homework Statement
making the worst possible combination of errors, an oxygen atom has a charge of 3.8x10^-39C. Treating the atoms as point particles, compare eletric force of two such oxygen atoms with gravitational force between atoms. is the net force repulsive or attractive?
Homework Equations
F = kqq/r^2
F = GmM/r^2
1 amu = 1.66x10^-27 kg
The Attempt at a Solution
oxygen atom = 32 amu
32 amu * (1.66x10^-27 kg) = 5.31x10^-26 kg
F(electric) = [ (9x10^9) * (3.8x10^-39)^2 ] / r^2
F(gravity) = [ (6.67x10^-11) * (5.31x10^-26 kg)^2 ] / r^2
F(gravity)/F(eletric) = 1.4x10^6
attractive because F(gravity) > F(electric)
but according to the answer key the answer should be 2.8x10^6
what am I doing wrong?