The change in entropy of 1.00 kg of water that is heated from 50°C to 100°C is (in cal/K)
a. 516
b. 312
c. 144
d. 946
e. 391
c
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A piano string of density 0.005 0 kg/m is under a tension of 1 350 N. Find the velocity with which a wave travels on the string
a. 260 m/s b. 520 m/s c. 1 040 m/s d. 2 080 m/s e. 4 160 m/s
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis. B. A spherical surface. C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis. D. A cylindrical can-like surface oriented with its central axis parallel to the y axis. E. A cone-like surface oriented with its central axis parallel to the y axis.
About how many stars are visible on a clear, dark night with the naked eye alone?
A) a few dozen B) a few hundred C) a few thousand D) tens of thousands E) millions and millions
An organ pipe open at both ends has a radius of 4.0 cm and a length of 6.0 m. What is the frequency (in Hz) of the third harmonic? (Assume the velocity of sound is 344 m/s.)
a. 76 b. 86 c. 54 d. 28 e. 129