Two students are doing an experiment. They mix 9 sugar cubes and 2 teaspoons of baking soda, then heat it to make a long black tube of carbon. The sugar cubes have a mass of 2 grams each and
the teaspoon can hold 3 grams of baking soda. What is the total mass of the reactants in this
experiment?

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?