A telescope has an objective lens with a focal length of 100 cm and an eyepiece of focal length 3.0 cm. What is the angular magnification of the telescope?
a. 30
b. 33
c. 75
d. 140
e. 103
b
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Venus has an unusual rotation rate because
a. it is very slow. b. it is very slow and retrograde. c. its obliquity is 90 degrees. d. it is very fast. e. it is very fast and retrograde.
Why won't Pluto collide with Neptune?
A) Pluto is always much farther from the Sun than Neptune. B) Pluto orbits the Sun exactly 2 times for every 3 Neptune orbits, which ensures they never come close together. C) Pluto's orbit never comes anywhere close to Neptune's orbit. D) Actually, a collision of the two is inevitable within the next billion years.
The ______________ surrounds the nucleus of a comet
a. head or coma b. cloud c. fuzz d. cover e. epinucleus
A heat engine operating between a pair of hot and cold reservoirs with respective temperatures of 500 K and 300 K will have what maximum efficiency?
a. 60% c. 40% b. 50% d. 30%