Gravity can be described as (2 points) O a magnetic force found in nature
O the force that moves electrical charges
O the force that repels object with like charges
O the force of attraction between two objects

What is the measure of a change in an objects velocity?

Aball horizontally thrown from a cliff at 8m/s

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?