Saturday, October 1, 2011
HW4 #5
I found all my components: xo=0, x=51.7, vo=0, and a= 9.8. First, I used to v^2 formula to find v, but that did not work. Then I found a using N=ma formula. I took the acceleration from that formula and plugged it into the v^2 formula, and that answer was also wrong. Does anyone have any ideas what I'm doing wrong?
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2 comments:
ok, you're close, reaaaallly close. Remember how Dr Winters makes the tables with the Parallel, Perpendicular, and IDK? Well we're concerned about the parallel column (the wagon is being pulled parallel to the slope). Well N is in the Perpendicular column, and the 9.8 you used first is in the IDK column. To find the acceleration in Parallel column, it's Fg*sinTheta (since you said it starts at 0, moves to 51.7, it goes in the positive direction so the acceleration has to be positive. Gotta watch those signs!)
I tried what you said and I didn't get a right answer. Where do we use the tension on the rope?
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