For the definition of observation, what question can i ask based on the definition?

Distinguish between a transverse wave and a longitudinal wave.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.