Which one of the following terms describes the resistance that a battery (or other emf device) has in a circuit?
a) super resistance
b) critical resistance
c) internal resistance
d) terminal resistance
e) electroresistance
Answer: c) internal resistance
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Describe the process by which the ozone hole promotes its own existence
What will be an ideal response?
Interstellar dust consists mostly of
A) ozone "smog." B) microscopic particles of carbon and silicon. C) hydrogen and helium atoms. D) tiny grains of water ice. E) the same tiny particles found in household dust.
A charge of uniform density (0.80 nC/m) is distributed along the x axis from the origin to the point x = 10 cm. What is the electric potential (relative to zero at infinity) at a point, x = 18 cm, on the x axis?
a. 7.1 V b. 5.8 V c. 9.0 V d. 13 V e. 16 V
How much water at 20°C is needed to melt 1 kilogram of solid mercury at its melting point of ?39°C? (The heat of fusion of mercury is 2.8 cal/gram)