i was wondering if any one knows a formula that would figure out how much power it would take for an electromagnet to push a certain amount of weight?

and

(this is hard to explain)

i am also looking for a formula to figure out the speed of a point on a fulcrum...

shit.. its hard to explain so maybe this makes more since:

say you tied a rock to a 2 foot string and then tied the other end of the string to a motor that spun at 10 miles an hour and did not "reel in the string" so the string stays at 2ft, how much faster would the rock be moving than the motor.

^i need a formula for that.

i hope that makes since.

the reason i need it is because i wanted to figure out how fast the motor would have to spin, and how long the "string" would have to be to make the "rock" travel at near light speed. even though its supposedly impossible, i still am interested. and i hope that this post makes since.

another attempt to elaborate:

length of string = L

speed of motor = M

speed of rock = R

so if the length of the string is ____ and the speed of the motor is ____, then the speed of the rock is ____.

i hope that makes at least some since.