Calculating Electric Force on q3 in Meters: A Superposition Approach

AI Thread Summary
The discussion focuses on calculating the electric force on charge q3 using the superposition principle, with charges q1, q2, and q3 located at specified coordinates. The user initially calculated the forces in the x and y components but received incorrect results from the mastering physics platform. Key points include the correct distances r13 and r23, which were clarified as 2.2m and 2m respectively, and the importance of using appropriate significant figures in calculations. The user identified a rounding error in their calculations, particularly in the y-component force, which contributed to the discrepancy. Accurate calculations and attention to detail in significant figures are crucial for successful online homework submissions.
veevee
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(x,y) axis in meters

q1=60microC (0,1)
q2=-34microC (2,0)
q3=13microC (2,2)

Fx3=? Fy3=?

i used superposition
F(net on 3)=F13+F23

broke it down into x and y components
Fx=(kq1q3/r13^2)(x/r13)
Fy=(kq1q3/r13^2)(y/r13) - (kq2q3/r23^2)

plugging in the numbers i got
Fx=1.3
Fy=-0.4

mastering physics says its wrong, and I can't seem to figure out where I went wrong...any suggestions?
 
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What did you use for r13, r23, x, and y ?

Be careful regarding the direction of the forces.
 
r13=sqrt(x2+y2)=sqrt(4+1)=2.2m

r23=2m

x=2
y=1
 
It might be simply too much round-off error.

(sqrt(5))2 = 5

2.22 = 4.84
 
the problem was i was entering 1 sig fig not 2 for Fy lol...online homework submissions...they'll waste your time for the simplest reasons..thanks though :)))
 

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