What is an ionization nebula?
A) a region of hot, low-density gas surrounding a recent supernova
B) a clump of gas that will soon give birth to a new star
C) a colorful cloud of gas that glows because it is heated by light from nearby hot stars
D) a name sometimes used to describe spiral galaxies besides the Milky Way
C) a colorful cloud of gas that glows because it is heated by light from nearby hot stars
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You are asked to design a metal alloy for a part with a room temperature application. The part is to be made by casting the metal into shape. When casting the part, liquid metal is poured into a mold that has a cavity with the shape of the part. To reduce cost by conserving energy and to utilize an inexpensive furnace that does not have a high temperature capability, it is desired that the metal alloy not have a high melting temperature. What type of metal alloy phase diagrams should you consider first for this part?
(a) Continuous solid solution (b) Eutectic (c) Compound formation (d) Peritectic
The Local Group is a _____
A) rich galaxy cluster B) poor galaxy cluster C) regular galaxy cluster D) spherical galaxy cluster
A 1.5 kg ball is floating in water. The volume displaced by the ball is
A. 0.0015 
B. 0.0027
C. 0.0036
D. 0.0040
E. 0.0051
A circular conducting loop lies in the xy plane of a certain reference frame. We are looking down on the loop with the +z axis pointing up at us. If the loop is immersed in a magnetic field that points in the -z direction and is increasing in magnitude as time passes, which way will current flow in the loop?
A. Counterclockwise B. Clockwise C. No current will flow.