While traveling on a train two boys play catch in the aisle. the train is moving north at 30.0m/s The ball is tossed front to the back at 5.0 m/s relative to the boys a bystander on the ground observes motion of the ball what is the speed of the ball relative to the bystander 25 south
35 south
25 north
35 north

Carbon 14 is a naturally occurring stable

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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?