As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be:
a. slower than the normal speed of sound in air.
b. equal to the normal speed of sound in air.
c. some constant speed faster than the normal speed of sound in air.
d. faster and faster.
B
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A piece of aluminum has density 2.70 g/cm3 and mass 769 g. The aluminum is submerged in a container of oil (oil's density = 0.650 g/cm3). How much oil does the metal displace?
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As you walk away from a plane mirror on a wall, your image
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