The average kinetic energy of a nitrogen molecule at room temperature (20°C) is
a. 2 × 10^?21 J.
b. 4 × 10^?21 J.
c. 6 × 10^?21 J.
d. 8 × 10^?21 J.
e. 1 × 10^?20 J.
e
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Nuclear Binding Energy: The stability of 
Cl with respect to alpha, beta-plus and beta-minus decay is to be determined. The following atomic masses are known:
A. not subject to alpha, beta-plus or beta-minus decay. B. subject to alpha decay only. C. subject to beta-plus decay only. D. subject to beta-minus decay only. E. subject to beta-plus or beta-minus decay, but not to alpha decay.
The star nearest the North Celestial Pole is ________.
A. Thuban B. Vega C. Denebola D. Polaris E. Mizar
By what factor is the resistance of a copper wire changed when its temperature is increased from 30.0°C to 115°C? The temperature coefficient of resistivity for copper = 3.9 × 10^?3 (°C)?1
a. 1.45 b. 1.12 c. 1.33 d. 0.669 e. 4.32
Daylight and nighttime hours are equal
A) during the summer and winter solstices. B) during the equinoxes. C) in mid-June and mid-December. D) during the equinoxes—mid-September and mid-March.