Recent content by tod88

Ah...that makes sense. So whenever there's no incline, all the weight is perpendicular (mg)(cos(0)) = mg and whenever the incline is 90˚, all the weight is parallel (mg)(sin(90˚) = mg and the object is in free-fall. And thanks for the comment on my diagram too...I see where I messed up the...

EDIT: I think I just figured it out...could you check out the picture I added and see if my reasoning is right? Thanks! http://img141.imageshack.us/img141/618/20080716103213jm3.png ------------ I'm working on free-body diagrams and I'm having trouble finding the components of the...

Thank you SO much ... That was exactly what I needed.

Homework Statement A car lift has two pistons. The one that lifts the car has an area of 2 meters squared, the one that is pushed down has an area of 1 meter squared. If a car weighing 2000kg is to be lifted 2m, how far must the smaller piston be pushed down? The pistons are of negligible...

Thanks very much for your help. I apologize if some of the questions were dumb / elementary...but I've figured out how I was thinking wrongly about the problem.

Homework Statement (i've put my questions in bold) The differential equation is dy/dx = xy^2 I separated variables and came up with (solving for c) c = -1/y - (x^2)/2 I then had to find the particular solution for y(0) = 1, so I came up with c = -1 - 0 so c = -1 I then...

Homework Statement f(x) = ln(sin(x)) find f'(x) The Attempt at a Solution I had a question about this problem. The answer on the website said that f'(x) = cot(x) or cos(x)/sin(x) but I disagreed. I got d/du ln(u) = du/u so f'(x) = cos(x)/sin(x) * cos(x) << for the chain rule...

Thanks...the problem just said that "her velocity is 9.9m/s" so I'm assuming that is velocity when she hits the net, otherwise, as I thought, it would be impossible to solve. Thanks for the help though...that does make more sense to do it that way.

Homework Statement A 65 kilogram tightrope walker falls vertically downward with a velocity of 9.9m/s. She falls into a net which stretches 1.5m vertically as it breaks her fall. What is the average net force on the walker as her fall is being broken, and what is the G force that she...

Okay, so Ff=(mu)9.81 m/s^2 and the acceleration of the skater is -1/2 m/s^2. I'm not sure what the An = Ag means. Normal acceleration equals acceleration due to gravity? Does this mean that if force is mass * acceleration and the masses are the same I can just do Ff=(mu)*Fn (letting the...

Finding Coefficient of Friction [solved] Homework Statement A girl is ice skating at 10 m/s. She stops skating and glides to a stop in 100m. Find the coefficient of friction of the ice. Homework Equations u[SIZE="1"]k = F[SIZE="1"]k / F[SIZE="1"]n F=ma The Attempt at a Solution...