A train moving 30. m/s approaches a station and sounds its whistle and passengers standing at the station hear a pitch of 440. cycles/second. What pitch will be heard when the train is at rest at the station? (assume the air temperature is 20.°C)
What will be an ideal response?
402. Hz
Physics & Space Science
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The population of the United States is approximately 290,000,000. Write this in scientific notation.
a. 
b. 
c. 
d. 
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A device that doesn't obey Ohm's law is a
A) copper wire. B) silver bar. C) light bulb. D) resistor. E) tungsten wire.
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How does the thickness of a lens relate to it being converging or diverging?
What will be an ideal response?
Physics & Space Science
Stars with high masses live longer than stars with lower masses
Indicate whether the statement is true or false
Physics & Space Science