Recent content by PKay

Homework Statement A coil 3.75cm radius, containing 500 turns, is placed in a uniform magnetic field that varies with time according to B = (1.20 x 10-2 T/s)t + (2.70 x 10-5x4)t4. The coil is connected to a 610-Ω resistor, and its plane is perpendicular to the magnetic field. You can ignore the...

Whoops. I'm sorry. I forgot to square root that. Thanks so much for your help! Now to tackle the other 2 monstrous problems.

I get 7.49-10^-10 but it says I'm wrong.

Thanks! I see it now... I end up getting R= R^2 * Mball/Mearth I'm hoping I'm in the right direction.

Am I supposed to leave it as a variable?

Homework Statement How far from a very small 110kg ball would a particle have to be placed so that the ball pulled on the particle just as hard as the Earth does? Homework Equations Fg= gMm/r^2 The Attempt at a Solution I used the equation and plugged in the numbers for the ball...

I think so. The problem is the axis is in the middle for that equation but since it's on the side, I'm not too sure anymore.

Homework Statement A string is wrapped several times around the rim of a small hoop with radius 8.00 cm and mass 0.180kg. The free end of the string is held in place and the hoop is released from rest. After the hoop has descended 60.0cm , calculate the angular speed of the rotating hoop and...

Yes! I was referring to that thread. I didn't know it was closed. Glad I did it correctly. I actually got it now. I actually still have a related question. C=2piR but why do we have to divide by 2 for the center of mass?

Homework Statement Exactly one turn of a flexible rope with mass m is wrapped around a uniform cylinder with mass M and radius R. The cylinder rotates without friction about a horizontal axle along the cylinder axis. One end of the rope is attached to the cylinder. The cylinder starts with...