Recent content by Blade707

Yeah I'm awful at it as well I found some angles online like 55 degrees and 71 degrees but neither of them get me to the correct answer given in the question. could it be because I need another force for the friction between the top ball and bottom ball? If so I just get more lost because in...

Uh I'm having troubles grasping this. Ok so using what you said before about the second part, I summed forces on one ball. (1) In the x: (mg/3)cos(theta)=N(cf) mg/3 is the weight of the top ball on the bottom sphere, N is the normal force at floor, and (cf) is my coefficient of...

Three identical spheres lie in contact with one another on a horizontal plane. A fourth sphere rests on them, touching all three. Show that, in equilibrium, the coefficient of friction between the spheres is at least (rad(3)-rad(2)) and that the coefficient between each sphere and the plane...

Thanks for all your help I think I solved it.

Wait I was being really stupid. The x acceleration is 0 isn't it? now the problem is I don't know what to do with that velocity!

The thing I can't get is the projectile motion, and it should be the easiest part! I feel so stupid. I tried using x=x(o)+v(o)t+(1/2)at^2 In the Y direction I had: 2=-vsin(20)+(.5*-9.8)t^2 but with this i don't know v or t and I don't know how to set up an x equation as it...

For conservation of energy I was looking at the block and had: (1/2)kx^2=mgh K is the spring constant, x the spring compression, m mass, g gravity, and h the hieght the block will get on the slope by the time its kenetic energy is 0. Still I have three unknowns. For the ball...

Please Help! (Momentum I Think) Could someone help me with this problem? I'd greatly appreciate it! A block of mass M = 1.00 kg contains a coiled spring and a ball of mass m = 0.250 kg. The spring is released when the block-ball system is at rest on the edge of a frictionless plane...