The number of moons in orbit around Mars is
A) zero.
B) one.
C) two.
D) three.
Answer: C
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Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
a. 92 Hz b. 95 Hz c. 98 Hz d. 102 Hz e. 108 Hz
Conversion of Units: A plot of land contains 5.8 acres. How many square meters does it contain? (1.0 acre = 43,560 ft2 and 2.54 cm = 1.00 in.)
A. 2.3 × 104 m2 B. 7.1 × 103 m2 C. 7.0 × 104 m2 D. 5.0 × 104 m2
What type of graph (straight line, parabola, hyperbola) was obtained in Procedure 1, Step 5?
What method does not directly use heat for generating electricity?
A. Geothermal power B. Hydroelectric dams C. Natural gas D. Nuclear power plants E. All of these methods use heat to generate electricity