grr....what am i doing wrong? Two 3.60g point charges on 1.00-m-long threads repel each other after being equally charged, as shown in the figure.(Figure 1) Assume that θ = 10.0∘.

Question

grr....what am i doing wrong?  Two 3.60g point charges on 1.00-m-long threads repel each other after being equally charged, as shown in the figure.(Figure 1) Assume that θ = 10.0∘.

anonymous · Answer

https://session.masteringphysics.com/problemAsset/1384363/8/25_P59.jpg

anonymous · Answer

|dw:1421919536483:dw|

anonymous · Answer

sum of the forces in x = -Fcoulomb+Ftensionx=0

sum of the forces in y = Ftensiony-mg=0

Ftensiony=Tsin(10)=0.0036(9.8) == .203

Fcoulomb=Ftensionx=.203cos(10)=.200

.200=9*10^9*q^2/.17^2  q=8.01^10-7.  

but that's wrong.  i got the distance as .17 by saying sin(10)*1 m (hyp) = .17