Infiltration in a house will ________
a. increase on windy days
b. raise the heating load by about 10%
c. reduce the number of air changes
d. be increased by caulking around windows
a
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The Sun appears to rotate only because Earth is revolving about the Sun
a. True b. False Indicate whether the statement is true or false
The radioactivity due to carbon-14 measured in a piece of a wood from an ancient site was found to produce 20 counts per minute from a given sample, whereas the same amount of carbon from a piece of living wood produced 160 counts per minute
The half-life of carbon-14, a beta emitter, is 5730 y. The age of the artifact is closest to A) 5700 y. B) 12,000 y. C) 15,000 y. D) 17,000 y. E) 23,000 y.
Two point charges of magnitude 4.0 ?C and -4.0 ?C are situated along the x-axis at x1 = 2.0 m and x2 = -2.0 m, respectively. What is the electric potential at the origin of the xy-coordinate system?
A) -36 × 103 V B) 0 V C) 36 × 103 V D) -48 × 103 V E) 48 × 103 V
A tsunami is unlike most other water waves mainly because it
A) is stronger. B) has a very long wavelength. C) moves very fast. D) is energetic.