If a string fixed at both ends resonates in its fundamental mode with a frequency of 150 Hz, at which of the following frequencies will it not resonate? (There could be more than one correct choice.)
A) 75 Hz
B) 300 Hz
C) 450 Hz
D) 500 Hz
E) 600 Hz
A, D
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In stellar astronomy, _____ states that the weight on each layer of a star is balanced by the pressure in that layer
A) the law of conservation of mass B) the law of conservation of energy C) the law of hydrostatic equilibrium D) the law of energy transport
If the growth rate of the number of solar collectors is 7% per year, then 1000 units in use in 2010 will grow to _______ units by the year 2040
a. 1200 b. 2000 c. 4000 d. 8000 e. 20,000
An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration is
A) 0 m/s2. B) 5 m/s2. C) 8 m/s2. D) 24 m/s2.
If Scorpius is now prominent in the summer sky, in 13,000 years it will be best seen
A) in the autumn. B) in the winter sky. C) at the same season; the heavens do not change. D) in the spring sky. E) It will not be visible then at all. All of its stars will have vanished by then.