- #1
gnarkil
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Homework Statement
A proton is on the x-axis at x = 1.2 nm. An electron is on the y-axis at y = 1.2 nm.
Find the net force the two exert on a helium nucleus (charge +2e) at the origin.
Express your answer using two significant figures. Enter your answers numerically separated by a comma, such that " Fx, Fy = ...,..."
Homework Equations
electron charge, e = -1.6*10^-19 coulombs
proton charge, + e = + 1.6*10^-19 coulombs
distance, r = 1.2 nm = 1.2*10^-9 m
constant, k = 9*10^9
force in Newtons, F = kq_1q_2/r^2 where q_1 and q_2 represent point charge
The Attempt at a Solution
charge at origin = +2e = 3.2*10^-19 coulombs
Fy = force y-axis = electron and origin charge = [(9*10^9)(-1.6*10^-19)(3.2*10^-19)]/(1.2*10^-9)2 = - 3.2*10^-10 Newtons
Fx = force y-axis = proton and origin charge = [(9*10^9)(+1.6*10^-19)(3.2*10^-19)]/(1.2*10^-9)2 = - 3.2*10^-10 Newtons
Fnet = sqrt(Fy^2 + Fx^2) = sqrt(2.048*10^-19) = 4.5255*10^-10 Newtons
i entered these and they were wrong:
Fx, Fy = 4.53*10^-10, -4.53*10^-10
Fx, Fy = 3.2*10^-10, -3.2*10^-10
are my calculations correct? what should i enter?