Hydrogen, like electricity, is
A) an energy source.
B) not an energy source.
C) a source of both thermal and electric power.
Answer: B
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Suppose a small, new planet were discovered at a distance of 4 AU from the Sun. According to Kepler's third law, what would be its period?
In a reflecting telescope, the objective is a mirror
Indicate whether the statement is true or false
In calculating the lateral magnification from a lens, a negative result means
A) the image is larger than the object. B) the image is smaller than the object. C) the image is directed downward. D) the image is inverted. E) the calculation is incorrect.
A metallic object holds a charge of -2.9 × 10^-5 C. What total number of electrons does this represent? (e = 1.6 × 10^-19 C is the magnitude of the electronic charge.)
a. 1.8 × 10^14 c. 6.1 × 10^13 b. 2.4 × 10^13 d. 4.2 × 10^14