Recent content by chrisfnet

It still shouldn't matter...? Both the magnetic field and the velocity are planar with the surface of the Earth. My thumb is, of course, normal to each which still leaves it.. up? I'm quite sure my math in this problem is correct and that I just forgot a direction.

So, since it's negatively-charged I use my left hand. This would indicate to me that the acceleration is in the "upward" direction, yes? Should I also indicated "upward" for the force then, also?

Homework Statement Earth's magnetic field near the equator is 5.0x10-5 T due north. Find the acceleration of an electron traveling northeast at 2.0x105 m/s. The charge on an electron is -1.602x10-19 C and it's mass is 9.109x10-31 kg. Homework Equations Fm = |q|vB*sin(theta) a = Fm/m The...

Anyone? I've been trying to work the first two still, and I just can't get past the fact that I think that I need more information.

I'm not even sure how to work either of the first two problems? It seems like I should need to know more information...

Homework Statement What is the voltage across a capacitor after a time of two constants when charging from zero voltage. When discharging from a fully charged condition? Homework Equations VCapacitor = VBattery(1 - e-t/2T) VCapacitor = VMaximum * e-t/2T The Attempt at a Solution I'm...

Homework Statement I have a concave lens where f < do < R. I have to provide a ray tracing diagram. The Attempt at a Solution I drew the focal ray through the focus and parallel to the principal axis. I drew the principal ray parallel to the principal axis then through the focus. I...

Actually, sqrt(2gh) would be right if it were a block going down the incline. However, it's not. Since it's a cylindrical shell, the equation sqrt(gh) is correct. I'd use: mgh = 1/2mvf^2 + 1/2Iwf^2 Which simplifies to vf = sqrt(gh) after substitution. This would give me the velocity at the...

Homework Statement http://img688.imageshack.us/img688/5277/loopb.jpg A cylindrical shell is released from rest and rolls down an incline without slipping. Find speed of shell at the top of the loop. h(incline) = 2.0m h(loop) = 1.3m The Attempt at a Solution vf = sqrt(g * yi)...

How would I integrate the conservation of energy?

Homework Statement A 0.24kg object traveling rightward at 3.5m/s collides head-on and elastically with a 0.40kg object traveling leftward at 2.1m/s. What are their velocities after the collision? If the objects are in contact for 0.010s during the collision, what is the magnitude of the...

I have an identical problem. I'm not sure where to proceed from where I left off, though. Could anyone help?

Awesome, thanks. Awaiting approval... argh. Who knows how long that'll take, haha.

Problem 1 A ball is fired from a height of 3.0m above the ground, with a speed of 13m/s and an angle of 22 below horizontal. At what time does the ball hit the ground? What is the impact velocity? Problem 2 A 28kg sign is suspended by two massless cables. Find the tension in each. Problem 4...

I was wondering, given my solutions and the problem statements; if someone could look over my work to see if there are any incorrect solutions/processes. Thanks!