Nanometer is a unit of _____
A) frequency
B) energy
C) mass
D) length
D
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Liquid crystal displays make use of __________
Fill in the blank(s) with correct word
A lens with a focal length of 20 cm has what power?
a. 5.0 diopters b. 0.2 diopters c. 2 diopters d. –5.0 diopters e. 0.02 diopters
A batter hits a 0.140-kg baseball that was approaching him at 30 m/s and, as a result, the ball leaves the bat at 40 m/s in the reverse of its original direction. The ball remains in contact with the bat for 2.0 ms
What is the magnitude of the average force exerted by the bat on the ball?
Why were ancient peoples unable to detect stellar parallax?
A) They did not look for it. B) They could not see distant stars. C) They did not have the ability to measure very small angles. D) They did not observe for long enough periods of time. E) They did detect it, but they rejected the observations.