Nucleosynthesis
a. is the process by which energy is produced at the center of the galaxy.
b. is the process by which hydrogen and helium are converted into heavier elements.
c. describes the structure of a globular cluster.
d. describes how the magnetic field of the galaxy traps cosmic rays.
e. describes the method by which neutral hydrogen produces 21 cm radiation.
B
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A spool of thread has an average radius of 1.00 cm. If the spool contains 126 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers
a. 100 c. 2000 b. 1000 d. 62,800
A series LR circuit includes a 9.0 V battery, a resistance of 0.20 
and an inductor. When the switch is closed, the circuit exhibits a time constant of 200 ms. What is the inductance of the circuit?
A. 42 mH B. 15 mH C. 32 mH D. 40 mH E. 22 mH
A circle has an area of 2.0 m2 . A second circle has triple the radius of the first. The area of the second circle is _____ times that of the first
a. 27 c. 3.0 b. 9.0 d. 0.67
The public debate about Martian canals was not resolved until
A) many scientists were unable to reproduce Percival Lowell's sketches of Martian canals B) the governing body of astronomy, the International Astronomical Union made an official statement on the matter C) the first spacecraft flew past Mars in 1965 D) the first spacecraft landed on Mars in 1976