|Oct27-09, 11:58 PM||#1|
1. The problem statement, all variables and given/known data
There is a piano that is being lowered 5 m. It has gravity force acting in y-direction (down) of 2500 N. Then it has two ropes attached, they are vectors that are pointing up and out. so T1 is 1830N [W60[tex]\circ[/tex]N] and T2 is 1295N [E45[tex]\circ[/tex]N]
2. Relevant equations
so the work by gravity is 12500 J
the work by T1 is 4575 J (opposite direction to work by gravity)
3. The attempt at a solution
so it would make sense that the work by T2 is somewhere close to 7000 J so that the net work is 0. but when i calculate it i get around 4000 J. Can someone check my math...
W = Fcos[tex]\theta[/tex][tex]\Delta[/tex]r
= 4579 J
???? - thnx!
|Oct28-09, 02:11 AM||#2|
I believe you have a problem with the angle of T1. Becausem, when I verified your calculations, I come to precisely 0 net work.
|Oct28-09, 11:47 PM||#3|
oh yes thank you! i was using an angle that gave the component perpendicular to motion :)
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