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

Physics & Space Science

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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

Physics & Space Science

The Local Group is a _____

A) rich galaxy cluster B) poor galaxy cluster C) regular galaxy cluster D) spherical galaxy cluster

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science