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Molecules of two solid substances actually collide with each other to transfer energy in this method of heat transfer. A) conduction B) convection C) insulation D) radiation 14) By now, you know that sound is produced by vibrations. These vibrations can travel through solids, liquids, and gases, but not through ______________. A) empty space B) granite rock C) living objects D) the center of the earth 15) Sound waves are mechanical waves in which the particles in the medium vibrate in a direction parallel to the direction of energy transport. Identify another name for this type of wave motion. A) transverse waves B) pressure waves C) longitudinal waves D) electromagnetic waves 16) Which type of energy transformation does NOT describe potential energy being changed into kinetic energy? A) Compressing a spring. B) A ball falling off a shelf. C) A bike coasting down a hill. D) Releasing a stretched rubber band. 17) An ice cube is placed into your hand. Over time, the ice cube begins to melt. Why does the ice cube melt? A) The ice cube is losing energy (heat) to your hand. B) Your hand is gaining energy (heat) from the ice cube. C) The ice cube is gaining energy (heat) from your hand. D) A chemical reaction occurs from your sweat that makes the ice cube melt. 18) Which object below involves two energy transformations when used? A) A radio plugged into an electrical outlet. B) A toaster C) A battery-operated remote control car D) A blender 19) speed of sound Material speed of sound in m/s air 331 helium 972 tap water 1493 sea water 1533 aluminum 5100 Based on the table and your knowledge of sound, what might be the best explanation of why sound travels faster in saltwater than fresh water? A) Less dense objects allow sound to travel faster. B) Saltwater has two compounds and fresh water only one. C) Closer packed or more dense media will have higher speed of sound. D) Saltwater has both solid and liquid, so it will be the average of the components. 20) What do we call the distance labeled from A to B and what could we do to the note played on an instrument to change that distance? A) From A to B is known as the wavelength and changing the pitch of the note will change its length. B) From A to B is known as the amplitude and changing the loudness of the note will change its length. C) From A to B is known as the wavelength and changing the amplitude of the note will change its length. D) From A to B is known as the wave height and changing the amplitude of the note will change its length.

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