An object is 5.7 cm from a spherical concave mirror. If the image is 4.7 cm tall and 10 cm from the mirror, how tall is the object?
A) 12 cm
B) 11 cm
C) 8.2 cm
D) 2.7 cm
D
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A girl is sitting on the edge of a pier with her legs dangling over the water. Her soles are 80.0 cm above the surface of the water. A boy in the water looks up at her feet and wants to touch them with a reed. (nwater = 1.333.) He will see her soles as being
a. right at the water surface. b. 53.3 cm above the water surface. c. exactly 80.0 cm above the water surface. d. 107 cm above the water surface. e. an infinite distance above the water surface.
The first telescopic photo shows what appears to be a single star. The second photo shows the same object, now revealed to be two distinct stars. What is the difference between the two photos?
A) The second photo has better (smaller) angular resolution than the first photo. B) The second photo was taken with a telescope that has greater light-collecting area. C) The second photo was taken by two telescopes rather than one. D) The second photo comes from a radio telescope, whereas the first photo comes from a visible-light photo.
Six pounds on Earth has what weight on the moon?
A) 1. kg B) 6. lb C) 36. lb D) 1. lb E) 1/6 lb
Resistance and Resistivity: If a quantity you calculated has units of 
what is that quantity?
A. potential B. resistivity C. resistance D. capacitance E. current