An automobile owner notices that when her car is outfitted with a muffler, the sound from the exhaust pipe is much quieter than without the muffler. when she asks her automobile technician about how a muffler works, he explains that a muffler is a device that matches the sound coming down the exhaust pipe but with waves out of phase from the pipe. what phenomenon is the automobile noticing and the technician describing?

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.

Atemperature inversion can cause a warm air mass to move over a colder air mass. this traps the colder air mass and prevents surface air from rising. this may result in which of these? a) smog b) acid rain c) freezing rain d) a thunderstorm

Is the vertical component of velocity ever zero?