What happens to the mass of a sample containing a radioactive element during its half-life?
a. the mass decreases by half. b. the amount of mass is doubled. c. eventually there is no mass at all. d. the mass remains the same.

Which term best describes the form sound takes as it travels away from a drum (a- gas)(b-music) ( c-waves) (d-particles

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.