What is the period of a signal that has a frequency of 60 Hz?
a. 60 s b. 60 s¯1
c. 1/60 s d. not determinable
c
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Observations indicate that it takes Saturn longer than Jupiter to complete one orbit about the Sun. This is in agreement with which of Kepler's laws?
A. First B. Second C. Third D. Fourth
Sonic Booms: The half-angle of the conical shock wave produced by a supersonic aircraft is 60°. What is the ratio of the speed of the aircraft to the speed of sound?
A. 0.87 B. 1.2 C. 1.7 D. 2.0
If a neutral element has the following chemical notation, how many electrons does it have?
fluorine-19 A) 9 B) 10 C) 11 D) 19 E) none of the above
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
a. 3.5 b. 49 c. 14 d. 43 e. 4.3