A person standing in the street is unaware of a bird dropping that is falling from a point directly above him with increasing velocity. If the dropping were producing sound of a fixed frequency, as it approaches the person would hear the sound
a. drop in frequency.
b. stay at the same frequency.
c. increase in frequency.
d. decrease in loudness.
e. stay at the same loudness.
C
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In stellar astronomy, _____ states that the weight of each layer of a star must be supported by the layer below
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
A 2.00-m long piano wire with a mass per unit length of 12.0 g/m is under a tension of 8.00 kN. What is the frequency of the fundamental mode?
A) 204 Hz B) 102 Hz C) 408 Hz D) 510 Hz E) 153 Hz
A ray of light, which is traveling in air, is incident on a glass plate at a 45° angle. The angle of refraction in the glass
A) is greater than 45°. B) is less than 45°. C) is equal to 45°. D) is unknown because it all depends on the index of refraction of glass.
If the Sun was gradually compressed while maintaining its mass in order to form a black hole, how would the curvature of spacetime be affected at the location of the Earth?
A) It would not change because the mass of the Sun is not changing. B) The curvature would become greater because a black hole has stronger gravity than the Sun. C) The curvature would be reduced because the Sun would get so much smaller. D) Compressing the Sun would not form a black hole because a black hole needs to be at least 2—3 times the mass of the Sun.