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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science