Recent content by ecthelion4

I need to prove that the magnetic force done to a square loop with a current by an uniform magnetic field is zero. The exact problem is this: I'm pretty sure you can calculate the force on a wire segment with F=(current through wire)(length of wire)x(magnetic field). Can I apply that in...

Are there any applications for the lissajous figures? I haven't seen any applications for them besides the ABC logo so I was curious as to it's uses both in science and everyday life.

Homework Statement From Q=m*Cp*(change in temperature), they give me all but Cp, which I calculate, and they also give me a mass per mole of the substance. Now the next part of the problem asks for the molar specific heat of the substance, but the equation for this eludes me. Homework...

I'd need to know the weight of the ball to do that, and all I'm given is how much energy the ball loses due to heat after each bounce, and how high the ball is when I throw it.

Homework Statement A tennis ball bounces on the floor three times. If each time it loses 21% of its energy due to heating, how high does it bounce after the third time, provided we released it 4.6 from the floor? Homework Equations The Attempt at a Solution I just can't deal...

...could it?

Not really. See that would translate into angular motion as this: Angular Displacement = 1/2*Angular Acceleration*Time² And since I got no time, that equation is useless. I need an equation that somehow relates ONLY angular displacement to angular velocity and angular acceleration Unless I'm...

Homework Statement A wheel accelerates from rest to 59 rad/s at a rate of 29 rad/s². How many revolutions the wheel turned while accelerating?Homework EquationsThe Attempt at a Solution I'm confused, I suck at this kind of problem. I got change in angular velocity which would be 59rad/s, and...

I did it :biggrin: All I needed was what Doc Al said. d2 would be the distance from the Earth to the moon minus d1, and since I had only one variable left, the rest was algebra. Thanks!

I got a problem though. I have no way of knowing the distance from the moon to the astronaut. If the forces are equal, and I need to know the distance from the astronaut to the earth, then the resulting equation cleared for d1 (d1 being the distance from the Earth to the astronaut), ends up as...

Homework Statement At what distance from the Earth should an astronaut be placed so that he will feel no net force when the Earth and the Moon and he are aligned? Homework Equations Fnet=ma F=(Gm1m2)/d^2 The Attempt at a Solution I assume I'm going to do a force annalysis, I'm...

ok, so if the speed of light is 299,792,458 m/s, then the proton's speed would be that times .999 right?

super, i figured put the problem, the force would be equal to (m*v^2)/r now the only thing I am missing is v, which is .999 of the speed of light, but what does that mean?

Homework Statement A proton moving at 0.999 of the speed of light orbits a black hole 4362km from the center of the attractor. What is the mass of the black hole? Homework Equations F=(Gm1*m2)/d^2 The Attempt at a Solution Assuming the above is correct, a proton I think has...

that was exactly it. The answer was 21.6 which rounded up to 22J . Thanks you were a great help!