Recent content by yoft

Actually I found the problem, I left off the 2ω x VA/O term in the acceleration formula. That adds in another V2/R term that solves my factor of 2.

Homework Statement Problem 15.18: I've defined the positive J (fixed) axis along the pole pointing upwards and the positive X (fixed) axis going to the right, with both centered at the point of contact between the hoop and the pole, which I will refer to as point O. The rotating axes...

Thanks a lot for your time!

It actually turns out that the reaction force at A is supposed to be negative... And then you're supposed to assume that that means the reaction force at A is actually zero since it can't be negative, and then you redo the calculations under the assumption that A is zero. I don't really know how...

So I'm told, but I couldn't (and still don't) understand how to go from linear velocity and angular velocity to angular acceleration and force. And I don't know how much easier it really would have been, it took around 6 lines the way I did it.

I think I got it, I used the equations of relative accelerations first to get linear acceleration in terms of alpha and then put them into the sum of moments and forces to some for alpha. Thanks for your help though!

Okay so using conservation of energy: T1+V1+U1-->2 = T2+V2 I get: mgh = 1/2mvG2 + 1/2IG[(VA-VB)/L]2 I'm guessing I have to put VA and VB in terms of VG somehow and solve for VG? And even if I get VG I'm still not sure how I would relate that to α and the reaction forces. I guess I...

I guess I still don't really understand what you're suggesting :( it seems to me that doing that adds in 2 additional unknowns (linear velocity at points A and B) while not really moving towards getting angular acceleration? And thanks so much for your help and time! Also: is your "AB" term...

I actually had tried using energy conservation but I couldn't really get anywhere with it. It's pretty straight forward to use the distance that the center of mass drops to calculate the linear speed right before it hits the floor but I don't know what to do with that information. I suppose the...

Homework Statement The 500lb box is released from rest in the position shown. The wall and ground are smooth. Determine (a) the angular acceleration of the box, and (b) the reactions at corners A and B at the instant after release. **G = center of mass **L = length of side = 2.5ft **phi =...