- #1

brad sue

- 281

- 0

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