Place the four steps in order to explain how an electric motor works. 1.A loop of wire is placed between the poles of a permanent magnet. The wire is attached to a commutator. Current runs through the electromagnet. 2.The direction of the current switches, causing the poles to switch and causing the magnetic field to reverse. 3.Electromagnetic forces, caused by the interaction of the electromagnet and permanent magnet, cause the electromagnet to rotate. 4.The electromagnet continues to rotate, causing the direction of the current to continue to change while the wire turns.

The density of a planet is 0.69 g/cm3 (density of water is 1.0 g/cm3). which of the following planets might this be? a. mercury b. venus c. saturn d. mars

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)