Money is useful to people because it is one of the options below as your
a. a medium of exchange
b. prestigious
c. nice to look at
d. something that makes you feel good

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

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

Inside of a windmill or a dam is a that is used to transform one type of energy into electrical energy. a. motor b. generator c. transformer d. power pack