Will upvote every answer! multiple choice!
what is the density of an object that has a mass of 30 kg and a volume of 0.5 m3?
a. 60 kg/m3
b. 0.02 m3/kg
c. 15 m3 • kg
d. none of the above

Astudent is given an assignment to demonstrate diffraction. he takes a photograph of a straw in a glass of water. the straw appears bent at the water level. which best describes this example? a) this is a good example of diffraction. b) this is an example of dispersion and not diffraction. c) this is an example of refraction and not diffraction. d) this is an example of reflection and not diffraction.

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

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?