Magnesium has 12 protons. How many electrons are in its first energy level?
a. 2
b. 4
c. 6
d. 8
e. 10
a
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Evaporator tubes in a refrigerator are constructed of 1 inch OD aluminum tubing with 1/8 in thick walls. The air surrounding the tubing is at 25ºF and the refrigerant in the evaporator is at 15ºF. Estimate the heat transfer to the refrigerant over 1 foot of length.
What will be an ideal response?
Resistance and Resistivity: Which one of the following quantities is equivalent to 1 ??
A. 1 J/s B. 1 W/A C. 1 V ? A D. 1 V/A E. 1 A ? s
Earth's magnetism arises from
A) charged particles at rest on Earth's surface and on clouds in the lower atmosphere. B) the Wizard of Oz. C) electric currents in Earth's interior. D) electric currents in the sun. E) electric currents in the upper atmosphere.
The continuous circulation of Earth's water is known as the
a. hydrologic cycle. b. aqua cycle. c. redistribution cycle. d. hydrogeologic cycle.