If we double only the mass of a vibrating ideal mass-and-spring system, the mechanical energy of the system
A) increases by a factor of .
B) increases by a factor of 2.
C) increases by a factor of 3.
D) increases by a factor of 4.
E) does not change.
Answer: E
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A 0.10g flea, having lept from the surface of a dog’s cranium, is observed to be moving at 1.25m/s when it is 5.00cm above the position from which it leapt. What was the elastic potential energy stored in its legs before its leap?
a. 
b. 
c. 
d. 
e. 
f. 
Notice the distorted galaxy images, such as the large arc-shaped structure, in this image of a galaxy cluster. What can astronomers learn by carefully measuring the distortions in this image?
A) the total mass of the cluster B) the amount of dark energy in the universe C) the precise distance to the galaxy cluster D) the age of the galaxy cluster
A 60-W light bulb connected to a 120-V source draws a current of
A) 0.25 A. B) 0.5 A. C) 2.0 A. D) 4.0 A. E) more than 4 A.
A solar or lunar eclipse will occur
a. when the sun is near the line of nodes of the moon and the moon is new or full. b. any time the moon is new or full. c. when the sun is near the solstice and the moon is new or full. d. half way through an eclipse year. e. when the sun is near the equinox and the moon is new or full.