Recent content by Poobel

OK thanks a bunch

Could you be a little more specific? Or should I just do right and left side for 3 random vectors, and thus prove that the equality is not true?

Umm yeah the question asks does blah=blah. I thought that it would not be true, however I am clueless how to put it on paper that the direction would not be the same. Should I call sum of vectors b and c a vector d?

Me again. I would really appreciate if you could help me with the following proof: a,b,c are vectors Does aproj.(b+c) =aproj.b + aproj.c Sorry for notation. Thank you.

Thanks a lot BobG. I did try to sketch.. more than once, but I guess I am just kinda slow today Thanks again.

yeah, that's what I said in the beginning, but the force then is approx 355N is that actually correct? then for part b) it would be 355N/sin 45?

ok then I can use 150/cos25 to find the friction, and thus answer a)?

then I should use 65 degrees? I am confused by the part that says perpendicular to the ground. Is it perpendicular to the ramp or the ground ground?

Fro some reason can't figure this one out: A box is sitting at a frictionless ramp, with a force of 150 N acting on the box, perpendicular to the ground. The ramp is at 25 degrees towards the normal. a)Determine the force parallel to the surface of the ramp, that would keep the box from...

The second part is really easy knowing your initial velocity and displacement you should be able to find your final velocity use Vf^2=Vi^2+2ad where a is acceleration due to Earth's gravity and d is your displacement i.e. distance to the ground first part with the slope though I just...

Allrighty I think I'm ready to hand the damn thing on thursday. If you want I'll tell you my mark Other than that -- thanks a lot for your help guys

try using d=Vit+1/2a(t)^2 If your Vi is zero it can work out nicely if you find acceleration to find acceleration use Vf^2=Vi^2+2ad work it back assuming you know Vf, Vi and displacement

No Problem

You should at least try and solve the problem since this place is for help not just asking physisists to solve the problems for you. Word of advice (sorry for offtop) read sticky notes No hard feelings

What grade physics was that problem anyway?