An object is attached to a vertical spring and bobs up and down between points A and B. Where is the object located when its elastic potential energy is a minimum?
A) one-fourth of the way between A and B
B) at either A or B
C) midway between A and B
D) one-third of the way between A and B
E) at none of the above points
C
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The origin of any microtides in the human body is most likely the
A) Sun. B) Moon. C) Earth.
Density: Substance A has a density of 3 g/cm3 and substance B has a density of 4 g/cm3. In order to obtain equal masses of these two substances, what must be the ratio of the volume of A to the volume of B?
A. 
= 
B. 
= 
C. 
= 
D. 
= 
E. 
= 
In a good conductor, the highest energy band containing electrons is
A) only partially filled. B) completely filled.
Star clusters have been observed within dark nebulae with:
A) optical movies made over decades. B) radio interferometers. C) infrared observations. D) the Chandra X-ray observatory. E) ultraviolet light creating the emission nebulae.