The critical angle for Lucite is 41.8
What is Brewster's angle for Lucite?
A. 33.7
B. 26.3
C. 48.2
D. 56.3
E. Brewster's angle does not exist for this material
D. 56.3
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Sunspots tend to occur in groups, or pairs, with the magnetic field around the pair resembling that around a bar magnet
a. True b. False Indicate whether the statement is true or false
Why are supermassive galaxies often found at the cores of rich galaxy clusters?
A) Most of the matter forming the cluster fell into the center to form one large galaxy. B) They are the result of many galactic mergers; one galaxy growing at the expense of others. C) Such a large galaxy attracted smaller galaxies around it to form a cluster. D) Large galaxies, passing a cluster, get captured into the center. E) Many globular clusters swarmed together to form it.
Where does the asteroid belt lie?
a. between Mars and Jupiter b. between Uranus and Neptune c. between Neptune and Pluto d. beyond Neptune e. well beyond the orbits of the planets
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 10^23 kg and r = 2.4 × 10^6 m?
a. 5.5 km/s b. 4.2 km/s c. 5.2 km/s d. 4.8 km/s e. 3.7 km/s