In a prolonged drought, groundwater is
A) unaffected—there is always water flowing underground.
B) in danger of being diminished.
C) safe from processes at the surface.
D) completely gone.
Answer: B
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The age of the Milky Way galaxy has been estimated to be at least 13 billion years based on
a. observations of globular clusters. b. observations of open clusters. c. 21-cm radiation from H I regions. d. the rotation curve of the galaxy. e. the energy produced by Sagittarius A.
Two masses are suspended by a cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 7.0 kg and the other mass, 
has a mass of 3.0 kg. The pulley turns on a shaft through the center of the pulley and supports the pulley and all the masses. The vertical force of the shaft on the pulley that supports the whole system is
A. 49 N upward.
B. 49 N downward.
C. 82 N upward.
D. 82 N downward.
E. 98 N upward.
Figure R5.10 shows a two-observer space time diagram for an Other Frame that moves at a speed of 0.5 relative to the Home Frame. What are the coordinates of event R in the Other Frame?
A. t? = –1.15 s, x? = 4.0 s
B. t? = 0.9 s, x = 3.4 s
C. t? = 6.5 s, x? = 1.7 s
D. t? = 2.2 s, x? = 3.2 s
E. Other (specify)
Distant galaxies tend to be much bluer than those nearby
Indicate whether the statement is true or false