A sample of phosphorus -32 has a mass of 20 grams. After 30 days, there are only 5 grams of the sample remains. What is the half-life of P-32?

Which form of cell division creates the sperm and egg, resulting in half of the chromosomes as the other cells?

Atruck with 34-in.-diameter wheels is traveling at 55 mi/h. find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes:

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum.