Recent content by xxdrossxx

For part (a): if the skier is moving at a constant velocity, then the force with which the rope pulls him up the slope is equivalent to the force with which gravity pulls him down the slope. This results in zero net force and zero net acceleration (thus, constant velocity). So, what we need to...

Torques hadn't even crossed my mind. :smile: Thanks so much, Marlon. I completely understand it now.

I'm having some trouble with the following question: http://www.mattmaly.com/spring.jpg Obviously I know to use Hooke's equation somewhere in this problem: F = -kx In the above equation, F = the force, caused by gravity, of the board pulling the spring horizontally, and k = 176 N/m as...

Ah, of course! I guess my first mistake was distributing the k. Dividing brings me to \frac{dP}{M - P} = kdt, and integrating both sides gives me -ln|M - P| = kt + c. Going from there: ln|M - P| = -kt - c e^{-kt - c} = M - P P = M - e^{-kt - c} I think I'm doing something very wrong here. The...

I'm having trouble with the following textbook problem: The only basic approach for solving differential equations that I know is to "separate and integrate", that is, have one side with P's and a dP, and the other side with t's and a dt (constants anywhere throughout), and then integrate both...

Oh, of course! It makes perfect sense to me now. So I'd just do the following: 0.5 (28.274 m/s)^2 = (9.8 m/s^2) * h h = 40.786 meters Does that look correct?

Woops, I'm sorry about that. Okay. In earlier problems that I've seen like this, they've involved an object spinning in a circle on the vertical plane...but in those cases, the object just barely makes it over the top of the circle, so that the kinetic energy at the top of the circle is equal...

Hello, I'm currently in a high school physics course, and I'm having trouble with a question in a "Work and Energy" chapter, which has focused on conservation of energy. I'm hoping that someone here can help me out. A grappling hook, attached to a 1.5-m rope, is whirled in a circle that lies...