# Search results

1. ### Magnetisim Problem! Just need an Equation.

Here's the problem: A proton follows a spiral path through a gas in a magnetic field of 0.010 T, perpendicular ot hte plane of the spiral. In two successive loops at points P and Q, the radii are 1.0 mm and 8.5 mm respectively. Calcualte hte hcnage in the kinetic energy of hte proton as it...
2. ### Point Charge Check?

Point Charge Check!? Hi, I' did this problem but for some reason I'm not getting the right answer. If you could check to see where I made my mistake I'd really appreciate it. Thanks! The problem: A poitn charge (m=1 g) at the end of an insulating string of length 55 cm is observed to be...
3. ### Any Hints?

Any Hints!?!? I'm stuck on these 2 problems.. Any hints would be helpful! 1. What is the minimum work needed to push a 950-kg car 810m up along a 9 degree incline? a) ignore friction, b) assume the effective coefficient of a friction retarding the car is .25. This is what I did, but I...
4. ### Conservation of Energy Problem.

Here's the problem: A .40 kg ball is thrown with a speed of 12m/s at an angle of 33 degrees. a) what is its speed at its highest point, and b) how high does it go? (Use conservat ionfo energy and ignore air resistance) I think I'm supposed to use the formula .5mvi^2 + mgy1 = .5mvf^2+mgy2 ...
5. ### Magnitude and direction for the total gravitational force

Please help me with the following problems!! Four 9.5 kg spheres are located at the corners of a squareof side .60m. calculate the magnitude and direction fo the total gravitational force exerted on one sphere by the other three. *I think I'm supposed to use the forumula : F= G(m1)(m2)/r^2...
6. ### What am I doing wrong?

I found this question to be answered twice on this site, both by hallsofivy. However, I still don't quite get it. Please help. A window washer pulls herself upward using the bucket pulley appartus. a. how hard must she pull downward to raise herself slowly at constant speed? b. if she...
7. ### Physics tips . ?

This is my first year of physics . On the first day my professor had already told us that we would be learning physics differently than any other class we would be taking. I had been able to zoom through all of my other classes like econ, pysch, english, math, chem, bio etc. For physics however...
8. ### Solved it; Don't understand it.

I did the problem, got the correct answer but dont' know why I was supposed to do it this way! Please help me understand the reasoning behind all this: A swimming is capable of swimming .45m/s in still water. She is swimming across a 75 m wide river whose current is .40 m/s. A) at what...
9. ### Trajectory of diver with vertical and horizontal velocities

Please help me with this problem! :yuck: :confused: :surprised I can't seem to get it set up quite right. A high diver leaves the end of a 5 m high diving board and strikes the water 1.3s later 3 m beyond the end of the board. Considering the diver as a particle,d etermine a) her initial...