An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. A light ray from the air above enters the oil at 45° with the normal and then goes into the water
What is the angle of refraction of this ray in the water? The index of refraction for the oil is 1.15, and for water it is 1.33.
A) 27° B) 36° C) 32° D) 39°
C
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To explain the retrograde motion of planets, Ptolemy introduced the concept of ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements is TRUE?
a) Jupiter's solid surface lies just below the cloud layers visible from Earth. b) The Great Red Spot is a dust storm near the South polar cap of Mars. c) There is no evidence to suggest that either Jupiter or Saturn has a rocky core. d) Neither Uranus or Neptune have ring systems. e) The planet Uranus is blue-green and virtually featureless.
Why did the solar nebula heat up as it collapsed?
A) As the cloud shrank, its gravitational potential energy was converted to thermal energy. B) Collisions among planetesimals generated friction and heat. C) Radiation from other nearby stars that had formed earlier heated the nebula. D) Nuclear fusion occurring in the core of the protosun produced energy that heated the nebula. E) The shock wave from a nearby supernova heated the gas.
Galileo's observation of the satellites of Jupiter showed that ________.
A. the Moon was not a flawless sphere B. nothing orbited Earth C. there were objects that did not orbit Earth D. planets orbited the Sun E. None of these choices is correct.