A thin 2.00-m string of mass 50.0 g is fixed at both ends and under a tension of 70.0 N. If it is set into small-amplitude oscillation, what is the frequency of the first harmonic mode?
A) 6.61 Hz
B) 13.2 Hz
C) 26.5 Hz
D) 52.9 Hz
B
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Sonar is used to determine the speed of an object. A 40.0-kHz signal is sent out, and a 42.0-kHz signal is returned. If the speed of sound is 345 m/s, how fast is the object moving?
A) 6.9 m/s B) 8.4 m/s C) 331 m/s D) 347 m/s
What is Hawking radiation?
A) a type of high-energy radiation that comes from inside a black hole's event horizon B) a type of radiation coming from objects supported by degeneracy pressure C) a hypothesized way for black holes to gradually shrink in mass D) a type of radiation that we have detected so far only with infrared telescopes in space
Which of these investigators did NOT contribute to our knowledge of atoms?
A) Aristotle B) John Dalton C) Robert Brown D) Albert Einstein
The Sun's energy comes from ________.
A. its rotation slowing down B. the conversion of mass into energy C. the release of magnetic energy D. meteors and asteroids striking its surface