Plutonium-32 has a half-life of 14.2 days. How many half-lives have passed in 99.4 days?

Abicycle slows down when the rider applies the brakes. what type of energy transformation is involved in this example? a. kinetic energy into heat energy b. heat energy into potential energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

If two parallel light rays hit a mirror, they will not be parallel to each other after they reflect.