I can't comment on your sanity :rolleyes: , but that goes back to my problem... How can it be 20 cm for the hanging block if Ug is not 0 at the point we would expect?
A 20.0 kg block is connected to a 30.0 kg
block by a string that passes over a light frictionless
pulley. The 30.0 kg block is connected to a spring that
has negligible mass and a force constant of 250 N/m,
as shown in the figure. The spring is unstretched
when the system is as shown...
Yes, and it/they were getting complex, so I wanted to get some feedback. I came up with the force exerted down on the chair as having an x component and a y component (different from what I posted). From there I was thinking I could apply that vector to the FBD of the chair and come up with my...
I'm trying to think up situations that will help me understand more complicated situations...
Let's say I have:
a box
on a slanted slope
on a chair
on the floor
The floor exerts a normal force on the chair. But, equal to what?
is it:
a box m_{1}gcos\theta
on a slanted slope m_{2}g
on a...
I have a question: If R were to drop to zero, the coaster would fall, right? So, for v=9.9 m/s, it would actually lose contact with the track and fall. But for any value even minutely larger than R=0 (and thus v=9.9 m/s) the coaster would just barely "stick" to the track? Even for a super...
I didn't mean to give the impression that I thought it was easy. I felt stupid because I made algebraic mistakes that I shouldn't have made. After spending so much time on the problem, I guess I was getting used to the "situation" in the problem... Thanks again.
Thanks! I got it. Boy, do I feel stupid. I think it looks ok, now, right? (this isn't homework, btw, it's just extra
practice) I made 2 algebraic errors:
1) when I pulled out the N, I didn't change the - to a +
2) when I divided by m, I didn't divide Q by m
I found them while...
Thanks for the help. I tried the problem over again using ma=Q/2 and was able to easily solve both (a) and (b). FYI The correct answer is listed as having the cos and sin reversed from what you said...
I'm a bit concerned though...
I was shown how to do part (a) as follows:
Find amax for...
Dorothy and Doc Al,
Thanks for the replies. My original reply was lost...
Question: For UCM problems like this in general, is it generally safe to ignore forces that would act in the tangential direction? (in this case mg*cos(theta))
Thanks again!
Given: 2 wedge shaped blocks arranged as a rectangle.
The bottom block is on a frictionless horizontal surface.
Horizontal force Q is applied to the vertical side of the bottom block.
Find Q max, the maximum value of Q where there is no slipping, in terms of us, m, and theta.
Masses: m and m...
I posted a reply in a thread (Falling Laundry) a couple of hours ago and now it's gone. Is this related to the server move? Should I just repost the reply?
I have a couple of questions for this problem, so I figured I'd post them here. I've spent a week on this, and have been through several books, so it's not due to a lack of effort.
1.) The normal force exerted on the laundry, the centripetal acceleration, and the component of gravity that...