Question

1.) At the race track, one race car starts its engine with a
resulting intensity level of 107.9 dB at point *P*. Then 7
more cars start their engines. If the other 7 cars each produce the
same intensity level at point *P* as the first car, what is
the new intensity level with all 8 cars running? ____dB

2.) A 96.0-Hz sound wave is barely audible at a sound intensity
level of 60.0 dB. The density of air at 20.0°C is 1.20
kg/m^{3}. Speed of sound in air at 20.0°C is 343 m/s. What
is the displacement amplitude of a 96.0-Hz sound wave? __ nm

Answer #1

At the race track, one race car starts its engine with a
resulting intensity level of 90.6 dB at point P. Then 8
more cars start their engines. If the other 8 cars each produce the
same intensity level at point P as the first car, what is
the new intensity level with all 9 cars running? Express answer in
units of dB

2. From a vantage point very close to the track at a stock car
race, you hear the sound emitted by a moving car. You detect a
frequency that is 0.852 times smaller than that emitted by the car
when it is stationary. The speed of sound is 343 m/s. What is the
speed of the car?
3.Hearing damage may occur when a person is exposed to a sound
intensity level of 90.0 dB (relative to the threshold of human...

From a vantage point very close to the track at a stock car
race, you hear the sound emitted by a moving car. You detect a
frequency that is 0.841 times smaller than that emitted by the car
when it is stationary. The speed of sound is 343 m/s. What is the
speed of the car?
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1. Consider a speaker at some fixed position, emitting sound
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1. A cord of mass 0.65 kg is stretched between two supports 8.0
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