The planets move ________ through the sky, relative to the background stars.
A. west to east
B. retrograde
C. northeast to southwest
D. east to west
E. None of these choices is correct.
Answer: A
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What will be an ideal response?
A proton that is moving freely has a wavelength of 0.600 pm. (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s)
(a) What is its momentum? (b) What is its speed? (c) What potential difference would it have been accelerated through, starting from rest, to reach this speed?
300-nm light has a lower frequency than 500-nm light
a. True b. False Indicate whether the statement is true or false
When you stand at rest with your left foot on one bathroom scale and your right foot on a similar scale, each of the scales will
A) read half your weight. B) read your weight. C) show readings that when added equal your weight. D) cancel your weight.