A concave mirror has radius R. When an object is located a distance 2R from the lens, which describes the image formed?
a. real, inverted, reduced
c. virtual, upright, reduced
b. real, inverted, of equal size
d. real, inverted, enlarged
A
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Nuclear Reactions: Determine the missing product X in the nuclear reaction 
U + 
n ? X + 2?-.
Fill in the blank(s) with the appropriate word(s).
From a particular location on Earth why can we see many more total eclipses of the Moon than total eclipses of the Sun?
A. The Moon is always in the same place in our sky while the Sun moves around the sky. B. The Moon is much bigger in the sky than the Sun. C. The line-up of the Earth Moon and Sun needed for a lunar eclipse happens many many times more often than what is needed for a solar eclipse. D. A total lunar eclipse is visible over a much larger part of the Earth's surface than a total solar eclipse.
If the length of a box is reduced by one-third and the width and height are doubled, by what factor has the volume changed?
A. 4/3 B. 2/3 C. 3/4 D. 3/2
Resistance and Resistivity: When a 1.0-m length of metal wire is connected to a 1.5-V battery, a current of 8.0 mA flows through it. What is the diameter of the wire? The resistivity of the metal is 2.24 × 10-8 ? ? m.
A. 12 ?m B. 6.0 ?m C. 24 ?m D. 2.2 ?m