A 40.0 cm long organ pipe is filled with air at 0
and is open at both ends. The velocity of sound in air at 0
is 331 m/s. Another 40.0 cm long organ pipe is filled with air at 20
and is open at both ends. What is the beat frequency between the fundamental modes of the two organ pipes?
A. 20.5 Hz
B. 17.5 Hz
C. 15.6 Hz
D. 14.9 Hz
E. 12.3 Hz
D. 14.9 Hz
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A) fission from concentrated radioactive elements B) high-energy photons from nearby stars C) gravitational contraction D) the conversion of mass into energy in accord with E = mc2
A sample of tendon 3.00 cm long and 4.00 mm in diameter is found to break under a minimum force of 128 N
If instead the sample had been 1.50 cm long and of uniform composition and cross-sectional area, what minimum force would have been required to break it? A) 32 N B) 64 N C) 128 N D) 256 N E) 512 N
If observations had shown that the cosmic microwave background was perfectly smooth (rather than having slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force. B) the fact that our universe is expanding. C) how galaxies came to exist. D) the existence of helium in the universe.
Diamond and graphite are
a. similar in physical properties. b. composed of the same element. c. of the same crystalline structure. d. bonded in the same manner.