What causes an approaching sound to be perceived as a higher pitch than the actual sound? a
the sound wave is compressed, decreasing the frequency of the wave
b
the sound wave is stretched out, decreasing the frequency of the wave
c
the sound wave is compressed, increasing the frequency of the wave

Porque crees que el agua no podia subir mas de 10 m de altura con ese tipo de bomba

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.