If the intensity level of one trombone is 70 dB, calculate a reasonable estimate for the intensity level of 76 trombones all playing simultaneously in the same place?
A) 146 dB
B) 89 dB
C) 70 dB
D) 76 dB
E) 82 dB
B
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Dark matter must be ____
a. baryonic b. non-baryonic c. neutral d. WIMPs e. isochronic
A 2.00-kg block of ice at 0.00°C is dropped into a very large lake at 25.0°C and completely melts. For water, the heat of fusion is 3.35 × 105 J/kg, the heat of vaporization is 2.25 × 105 J/kg, and the specific heat is 4190 J/kg•K
The net change in entropy of the system consisting of the ice and the lake due to this melting process is closest to A) 2.45 × 103 J/K. B) 2.24 × 103 J/K. C) 2.06 × 102 J/K. D) -2.45 × 103 J/K. E) -2.06 × 102 J/K.
Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. Sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. Which one, if either is correct?
a. Beryl, because low thermal conductivity results in low heat transfer. b. Beryl, because low thermal conductivity results in high heat transfer. c. Sapphire, because low thermal conductivity results in low heat transfer. d. Sapphire, because low thermal conductivity results in high heat transfer. e. Neither, because low heat transfer is desirable both in summer and in winter.
This graph plots planetary mass on the horizontal axis and planetary radius on the vertical axis. Which of the four points marked by one of the bold numbers 1 through 4 represents a planet with the greatest mass?
A) Point 1 B) Point 2 C) Point 3 D) Point 4