Recent content by Chileboy

Ice surfing! Hi, this is the problem: A small boy places a plank of wood on a frozen pond and then, taking a run up, jumps onto one end of the plank. If the plank is perpendicular to the boys trajectory and there is no friction between the plank and the ice, How will the plank move after the...

I actually got the result on my own in the end which is very satisfying. Thanks for taking so much time to help me out.

Let's see.. the centripedal acceleration has to be v^2/r of which cos(alpha)g is given by gravity, so N =m(v^2/r -cos(alpha)g) perpendicular to the circle and cos(alpha)N is the force that could lift the circle. From conservation of energy for the particles i get v^2= 2rg(1-cos(alpha))...

That's the right answer, i'll try my best to work it out tonight. I'd appretiate you posting your workings though!

The second problem is a bit futher up in this thread.

Right i forgot to put -(M+m)g in the force equation, thanks for the help. I wonder if you could help me with the second problem i posted i cant't really get my head around it. P.S. How do you use the special font for numbers and mathematical symbols?

Okay i hope I've got this right, does that mean that the particle will come off the tray at Lo + (M+m)g/k i.e when the force applied by the spring is equal to -(M+m)g?

Okay another problem... A ring (mass = M) is suspended by an ideal cord from the ceiling, two equal masses (mass = m) are released from the top of the ring and slide down, one on either side of the ring, without friction. The question is: What condition must the masses meet in order for the...

Lets see.. N=0 when a =0 is that right? does that mean the particle will come off the tray at Lo?

Hi fellow physicists, I have some homework problems I'm trying to work through and i need to know if I'm on the right track. This is the problem: A Spring is upright (vertical) and has a constant k and a length Lo, a tray of M mass is attached to the spring and on the tray is placed a...

I'm having trouble with this problem... A ring (mass = M) is suspended by an ideal cord from the ceiling, two equal masses (mass = m) are released from the top of the ring and slide down, one on either side of the ring, without friction. The question is: What condition must the masses meet...