# Recent content by chmilne

1. ### Collisions in Two Dimensions

I'm not following you. Will you please elaborate and be more specific?
2. ### Collisions in Two Dimensions

The Problem: The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.050 kg and is initially at rest. The collision is not head-on...
3. ### Work and Energy of skier

The problem states the skier is on a hill that is 25 degrees from the horizontal and that the displacement is 1.9m. So, the 1.9m could not be veritcle, it would also be 25 degrees from the horizontal. However, to answer part b, you need to calculate for 180 degrees, not 155 degrees.
4. ### Work and Energy of skier

I get it. The angle should be 180, not 155 because the force run along the x axis and using 155 would not be the entire x axis. This mean that the answer to part b is 140.603N. Correct?
5. ### Work and Energy of skier

I believe I have part A correct, but I have having some trouble with part B. A 63-kg skier coasts up a snow-covered hill that makes an angle of 25° with the horizontal. The initial speed of the skier is 6.6 m/s. After coasting a distance of 1.9 m up the slope, the speed of the skier is 4.4...
6. ### Equal Tetrahedron

Here's the problem: A regular tetrahedron is a three-dimensional object that has four faces, each of which is an equilateral triangle. Each of the edges of such an object has a length L. The height H of a regular tetrahedron is the perpendicular distance from one corner to the center of the...
7. ### Virtical Circles

Thanks for the help. There was something lost in translation when the professor told me 'to one digit.' Thanks again.
8. ### Virtical Circles

CORRECTION: UP: F_N Down: W (mg)
9. ### Virtical Circles

These are the only forces I see: UP: F_c, F_N Down: W Am I missing any?
10. ### Virtical Circles

Here's the question. A roller coaster at an amusement park has a dip that bottoms out in a vertical circle of radius r. A passenger feels the seat of the car pushing upward on her with a force equal to twice her weight as she goes through the dip. If r=20.0 m, how fast is the roller coaster...