Along stairway with a metal handrail runs between the houses of amelia and her friend michelle. after getting their parents' permission, the two girls often play near the stairs. one day, michelle stands at the top of the steps and taps the railing with a stone. amelia stands at the bottom of the steps with her right ear pressed against the railing. amelia sees michelle tap the railing, then she hears the sound with the ear that is pressed against the railing. last, amelia hears the sound with her other ear. why did amelia hear the sound with her right ear before her left ear?

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.

Using the free-body diagram, calculate the net force acting on the sled. is the sled in a state of dynamic equilibrium?

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light