Our teacher gave us a scenario we have to prepare to solve for a lab tomorrow:
He has one of those toy flying airplanes suspended from the ceiling on a string of some length. He is going to charge it and start it spinning, and we have to figure out how long it takes for the plane to make 5 revolutions. Trouble is, the only values we are allowed to use to solve the problem are any lengths we can measure, such as the length of the string the plane is suspended from, distance to the floor, etc. I don't know what equations I should use to solve this problem. Any help?