A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling away from the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 73 Hz
B) 75 Hz
C) 77 Hz
D) 79 Hz
E) 81 Hz
A
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A scientist intuitively believes that a higher power must be present in the universe. However, she can provide no experimental data to support her belief. This is an example of
A) pseudoscience B) hypothesis-driven science C) nonscience D) discovery science
The linear momentum of a 100.0 kg object moving around a 30.0 m circle at a constant speed of 2.20 m/s is
a. 0.0 N b. 220 N c. 242 N d. 6600 N
A summary of the nuclear reactions that power our sun is 4p ? 4He + 2e-, with masses of 938.272 MeV/c2 for a proton, 3727.38 MeV/c2 for the helium nucleus, and 0.511 MeV/c2 for each electron
How much energy is released by each of these reactions? A) 24.69 MeV B) 28.3 MeV C) 2790.13 MeV D) 279.01 MeV
Conduction: The process in which heat flows by the mass movement of molecules from one place to another is known as
A. conduction. B. convection. C. radiation.