The sidereal drive of a telescope mounting must turn the telescope
a. southward about the polar axis.
b. eastward about the polar axis.
c. westward about the polar axis.
d. northward about the polar axis.
e. none of the above
C
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The description large somewhat dirty snowball model fits the physical structure of ____________________
Fill in the blank(s) with correct word
A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (l = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
a. 218 b. 109 c. 55 d. 318 e. 443
If two quarks in an anti-proton have the color anti-red and anti-blue, the third quark must have the color
a. red. b. blue. c. anti-purple. d. anti-green.
The work done in pushing a TV set a distance of 2 m with an average force of 20 N is
A) 2 J. B) 10 J. C) 20 J. D) 40 J. E) 800 J.