Posted by Jennifer on Sunday, December 5, 2010 at 10:22pm.
The sum of the two chain tesnions is
T1 + T2 = 650 + 490 = 1140 N
Take moments about the chain nearest to the girl and set the sum equal to zero. Call the cable nearest the boy "1". The boy is 0.95 m from the girl's end, "2".
T1*1.7 -0.95*650 - 0.5*490 = 0
Solve for T1. Then use T1 + T2 = 1140 N to solve for T2.
Shouldn't we consider the weight of the swing as well?
Yes. Good thinking. I overlooked it
So then assuming the swing is uniform, do I have:
T1 + T2 = 650 + 490 + 150 = 1290 N
Then,
T1*1.7 -0.95*650 - 0.5*490 -.85*150 = 0
Solve for T1 and then use the first equation to solve for T2?
Yes. :-)
how is this equation right? when i multiplied all those numbers to get T1 i got a huge number...to plug it back in for T2 i would get a negative number...
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