You may have had an opportunity to skip rope or watch someone else skip rope. If you have one rope, you can skip a yourself or you can include two friends, each friend holding one end of the rope and you skipping in the middle. In this instance your friend represent notes and you were anti-node. Is it possible to skip rope with three friends with two of you in yhe middle jumping at different times?.

Cyclotrons are widely used in nuclear medicine for producing short-lived radioactive isotopes. these cyclotrons typically accelerate h- (the hydride ion, which has one proton and two electrons) to an energy of 5 mev to 20 mev. this ion has a mass very close to that of a proton because the electron mass is negligible—about 1 2000 of the proton’s mass. a typical magnetic field in such cyclotrons is 1.9 t. (a) what is the speed of a 5.0-mev h-? (b) if the h- has energy 5.0 mev and b = 1.9 t, what is the radius of this ion’s circular orbit?