Recent content by John Helly

Well, this is what I came up with and it's obviously wrong but I don't know why.

Mahalo.

Will do.

Right. More head scratching.

Ok. Correct?

Mahalo. I was trying to interpret it geometrically and could't get the directions right.

This seems to make sense.

Better?

Ok.

Here's what I came up with. I can see it when it rotates down but still seems kind of odd.

Will do.

Good point. So it looks like the original published answer is correct.

That's what is given as an answer in the solutions. I don't think it's correct. I think the answer is backwards. I think the horizontal force on the vertical wall should be Fw=(1/cos(alpha)) * kg-wt. Not Fw=tan(alpha)*kg-wt. It sounds like you agree. I'll try to draw a decent diagram and...

Right. Sorry. Here it is. 1.1 A ball of radius 3.0 cm and weight 1.00 kg rests on a plane tilted at an angle alpha with the horizontal and also touches a vertical wall. Both surfaces have negligible friction. Find the force with which the ball presses on each plane. Fw is the force on the...

Fw = sec(alpha) * kg-wt Fp = tan(alpha) * kg-wt