Recent content by xiuxiu

Oh yeah, and we can't add any energy to the system. e.g. 3 kg pulleys that lower to change potential gravitational energy into kinetic energy.

[FONT="System"]Okay, so here's the competition: We will be given a spring that can stretch to no more than 40 centimeters in length. That spring has to be used to power some type of vehicle to move as far and as slow as possible. Our score will be determined by this: time*distance=score...

Ohh... If you change the magnetic flux, doesn't it reverse the direction of the current? So... sorry about that last reply... haha I'm still lost? :confused:

Thanks. I don't know what happens if I change the magnetic flux through the coil? We were only given one demonstration. Anyway, I ended up handing it and I said it was a coil of wire with a magnet inside of it. I stated that some machine moved the magnet back and forth through the coil...

I was recently given a physics lab and it's very hard for me to complete. We were shown a demonstration in which some unknown object was in a "black box." There was a wire leading from the box that was plugged in, thus the object was charged. A light bulb was led around the box. Then, at the...