A train is traveling away from you at 120 km/h. It blows its whistle, and you hear a tone of 0.400 kHz. Take the speed of sound to be 340 m/s. What frequency does the whistle actually produce?
A) 444 Hz
B) 439 Hz
C) 364 Hz
D) 361 Hz
B
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Which kind of object is the best standard candle for measuring distances to extremely distant galaxies?
A. a white dwarf. B. a Cepheid variable star. C. a white dwarf supernova.
Which of these were observed from Earth, prior to spacecraft missions to Mars?
A) seasonal changes in the polar caps B) eruptions of Mount Olympus C) dust storms capable of covering the entire planet D) Both A and C are correct. E) All of the above are correct.
A 15-?F capacitor is charged to 40 V and then connected across an initially uncharged 25-?F capacitor. What is the final potential difference across the 25-?F capacitor?
A. 12 V B. 18 V C. 15 V D. 21 V E. 24 V
In this course we have seen that baryons have inertial and gravitational mass, intrinsic angular momentum, and other internal properties that have been given names like baryon number, strangeness, charm, etc. The Standard Model's explanation for these properties of baryons is that
a. the baryons are states of something more elementary that can exist in multiple quantum states. b. the leptons are states of something more elementary that can exist in multiple quantum states. c. photons are states of something more elementary that can exist in multiple quantum states. d. according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. e. quarks are states of something more elementary that can exist in multiple quantum states.