A standing wave is likely produced when
A) two waves overlap.
B) a wave reflects upon itself.
C) the speed of the wave is zero or near zero.
D) the amplitude of a wave exceeds its wavelength.
Answer: B
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Estimation: Estimate the number of times the earth will rotate on its axis during a human's lifetime.
A. 3 × 104 B. 3 × 105 C. 3 × 106 D. 3 × 107 E. 3 × 108
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An object is pulled with three forces: one at 20 N to the right, another at 40 N to the right, and the third at 30 N to the left. The net force is
A) 60 N to the right. B) 60 N to the left. C) 30 N to the left. D) none of the above
According to the consensus among those scientists who have studied the question, what is the scientific status of the notion that Earth is now or was in the past visited by extraterrestrial life?
A) Although extraterrestrial life is theoretically plausible, and there is observational evidence for it, most scientists still will not accept the conclusion that we have been visited because it seems too unconventional or "kooky." B) Extraterrestrial life is theoretically plausible, and there is real observational evidence for it, which is why most scientists believe that we have been visited. C) Although there is no real evidence that Earth has been visited by extraterrestrials, extraterrestrial life is theoretically plausible. D) Extraterrestrial life is implausible on general theoretical grounds, and there is no real evidence that Earth has been visited by extraterrestrials. E) Although extraterrestrial life is implausible on general theoretical grounds, there is observational evidence for it.