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Explain me this situation

A spider is attached to two threads of equal length that make a 120^{o}angle with each other. The spider is motionless and its mass is m=30mg.

What is the tension in each thread?

According to the Newton first Law, the sum of the force must be 0.

T_{1}+T_{2}+F_{spider}=0

since the threads are the same length and symetrical, T_{1}=T_{2}.

F_{spider}=-3.0 *10^{-4}N

so I found T_{1}=1.5 *10^{-4}N

I am surprised to see that the answer is 3.0 *10^{-4}N on each thread

please now I am confused! help

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# Homework Help: Newton's first Law

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