If an ice cube with the mass of 5.0 grams melts in a closed system such as closed glass jar, what is the mass of the liquid water after the ice cubes completely melts? A) 4.0 grams

B) 5.0 grams

C) 6.0 grams

D) The mass cannot be determined without knowing the volume.

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?