Help a dumbass out with General Physics

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Anonymous
Help a dumbass out with General Physics 2016-02-02 04:59:07 Post No. 47526
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Help a dumbass out with General Physics Anonymous 2016-02-02 04:59:07 Post No. 47526 [Report]

I'm in the second sequence to general physics and I'm already getting my shit pushed in. Been stuck on this problem, I would assume we are supposed to use Coulomb's Law.

My thought was that since Fnet2 is 0.79N, I could set that equal to F2,3 and F2,1 so that you do

0.79N= (k*q2*q1/d^2) + (k*q2*q3/d^2)

Then you just solve for d by getting the square root, but none have my answers have been correct so far.

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Anonymous 2016-02-02 05:05:41 Post No.47530
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Anonymous 2016-02-02 05:05:41 Post No.47530 [Report]

>>47526
plug in your values and make sure it adds up to .79N

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Anonymous 2016-02-02 09:51:08 Post No.47640
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Anonymous 2016-02-02 09:51:08 Post No.47640 [Report]

>>47526
The forces are not in a straight line, so you cannot simply add them.

q2 and q3 have positive and negative charges, so the force F2,3 is directed from q2 toward q3 on the triangle side. q1 and q2 are both positive, so the force F2,1 is directed away from q1 along the continuation of the corresponding triangle side. You obtain a force parallelogram with angles 60° and 120°. You can either use vector addition to calculate the resulting force or simply draw it a perpendicular line on one side to obtain a right triangle and use the theorem of Pythagoras after finding the side lengths by subdividing one force in its components (direction as the second force and direction perpendicular to the second force).