An object is thrown upwards with a speed of 14 .0 m/s. How long does it take it to reach its maximum height?
A) 1.22 s
B) 1.43 s
C) 3.14 s
D) 4.15 s
E) 5.31 s
B
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The difference between lightwaves approaching and lightwaves receding is
A) when approaching, lightwaves have higher frequency; when receding their frequency is lower. B) when approaching, lightwaves have lower frequency; when receding their frequency is higher. C) the frequency of approaching lightwaves remain constant, while receding lightwaves are invisible. D) There is no difference
Must acupuncture be responsible for the patients' recovery?
A) No. Acupuncture may be responsible for the healing, or it may not. Correlation does not necessarily imply causation. B) Yes. If the study was run by qualified M.D.s, then we should respect their findings that acupuncture cured these patients. C) No. Acupuncture is hippie, new age stuff, and is not respected by reputable doctors. D) Yes. The patients stated afterwards that they knew it had helped, and these people know their own bodies better than we do.
Newton's Second Law of Motion tells us that the net force applied to an object equals its ________
A) mass times velocity B) mass times acceleration C) mass times energy D) momentum times velocity
Strictly speaking, gas pressure inside an inflated stretched balloon is
A) less than air pressure outside the balloon. B) equal to air pressure outside the balloon. C) slightly greater than air pressure outside the balloon.