The speed of a 10-kHz sound wave in seawater is approximately 1 500 m/s. What is its wavelength in sea water?
a. 5.0 cm
b. 10 cm
c. 15 cm
d. 20 cm
e. 29 cm
C
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Long period comets are thought to reside mainly in the:
A) asteroid belt. B) Kirkwood gaps. C) Kuiper Belt. D) Oort Cloud. E) Interstellar Medium.
In a steam engine, steam at 140°C in a turbine does work on an external system, and the steam leaves the turbine at 100°C. The efficiency of the steam engine is 5%. The relevant physical principle is the first law of thermodynamics
a. True b. False Indicate whether the statement is true or false
Which of the following air pollutants is emitted mainly by the automobile?
a. particulates b. carbon monoxide c. sulfur dioxides d. hydrocarbons e. nitrogen oxides
With each pass of a comet about the Sun, its masss
A) is appreciably reduced. B) remains virtually unchanged. C) actually increases.