What type of volcano forms a layered, composite cone?
a. Fumarole
b. Cinder cone
c. Stratovolcano
d. Shield volcano
c
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About what percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 0 percent B) 0.1 percent C) 2 percent D) 20 percent E) 80 percent
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
When considering light as made up of individual "pieces," each characterized by a particular amount of energy, the pieces are called ________
A) gamma rays B) wavicles C) photons D) frequencies
A 2.0 kg ball is attached to one end of a light rod that is 1.2 m long. The other end of the rod is loosely pinned at a frictionless pivot. The rod is raised until it is vertical, with the ball above the pivot
The rod is released and the ball moves in a vertical circle. The tension in the rod as the ball moves through the bottom of the circle is closest to: A) 20 N B) 40 N C) 60 N D) 80 N E) 100 N