Einstein theories tell us that the speed of light
A) depends on one's frame of reference.
B) is constant in all frames of reference.
C) provides accurate clocks.
D) slows in a transparent medium.
Answer: B
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In most residential electric water heaters, the high-temperature cutoff and ____ are combined into one device.
Fill in the blank(s) with correct word
Planetary geologists now refer to the exterior of the newborn moon as__________
A) a multiringed basin B) a micrometeorite C) a magma ocean D) coronae
A capacitor consists of a set of two parallel plates of area A separated by a distance d. The capacitor plates carry charges +Q and -Q. If the separation between the plates is doubled, the electrical energy stored in the capacitor will
A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
Standing Sound Waves: A string that is 0.15 m long and fixed at both ends is vibrating in its n = 5 harmonic. The sound from this string excites a pipe that is 0.82 m long and open at both ends into its second overtone resonance. What is the distance between a node and an adjacent antinode, in the string? The speed of sound in air is 345 m/s.
A. 15 mm B. 7.5 mm C. 23 mm D. 30 mm E. 150 mm