As you stand near a railroad track, a train passes by at a speed of 30.9 m/s while sounding its horn at a frequency of 218 Hz. What frequency do you hear as the train approaches you

True or false: the cycle of seasons on the earth is caused by the tilt of the earth on its axis toward and away from the sun.

Light that is polarized along the vertical direction is incident on a sheet of polarizing material. only 96% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. no light passes through the second sheet. what angle does the transmission axis of the second sheet make with the vertical?

The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water