It seems that you've solved the quadratic wrong. When I did it, I got different values. And yes, you should have two values when you solve the quadratic, the smaller of the two will be the time when the stone passes the 3.675m mark while ascending, and the larger one is when it is descending...
Well, it looks like you calculated your number of rotations right, but I noticed you plugged that directly into your equation. The value theta represents the radians that are displaced, not the number of revolutions. You first need to convert your revolutions to radians and then use that value...
Well, the approach was fine, however it looks like you made a little mistake on converting your mass, judging by your coefficient in front of v². it looks like you used the correct mass for the rest of your values however, so it must have been just a little slip up for that one. Try solving it...
Assuming your SPE is spring potential energy, and you're setting that value to zero, you're on the right track. Can you post your actual calculation steps? I should be able to point you in the right direction if you show me how you plugged your numbers in for your calculations =)
*facepalm* well, that solves that mystery. Not sure if I should be glad or ashamed that it wasn't my physics that was off as much as it was just me not realizing that. I must have re-read that problem at least five or ten times, and missed it every time.
Thanks for the help =P
Well, I haven't gotten to this part yet, we just started the chapter concerning this type of problem.
However, looking in the book I found that the escape speed (v) = √(2GM/R)
I don't think you need the mass of Jupiter since you aren't launching from its surface, you're just flying past it's...
Right, but since the bullet embeds itself in the door 10 cm from the hinges (aka its axis of rotation) that gives a distance of .1m, which is what I used in the calculations. Also, taking the cross product of r x mv gives (0i + (-.1)j) X .005(1000i + 0j) = (-.5)j*i = -(-.5) = .5 which is what my...
Hey guys, I've been a member of this site for a while now, looking at other people's homework problems and attempting them as extra practice. I find that reading about what other people have trouble with when attempting physics problems helps me avoid them myself, and it has worked pretty well...