A person on a bike (m=90kg) is traveling 4m/s at the top of a 2m hill. What is his/her gravitational potential energy?

Which changes of state do the labels represent? a: b: c:

Which is the best predictor of the radioactive nature of an isotope? o the proton-to-electron ratio the neutron-to-proton ratio o the neutron-to-electron ratio the electron-to-proton ratio

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine