If we compress the entire history of the universe into one year, modern humans evolved
A) at 9 PM on New Year's Eve
B) at midnight on New Year's Eve
C) a couple of minutes before midnight on New Year's Eve
D) a few seconds before midnight on New Year's Eve
C
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Which of the following has the smallest albedo?
a. Water b. Polar ice c. Fresh snow d. Dry sand
Air with a density of 1.20 
flows through a 10.0 cm diameter pipe with a velocity of 1.20 m/s. What is the mass flow rate?
A. 0.0148 kg/s B. 0.0131 kg/s C. 0.0120 kg/s D. 0.0113 kg/s E. 0.0098 kg/s
Two forces act on a object. One force has magnitude 65 N directed 59° clockwise from the positive x-axis, and the other has a magnitude 35 N at 32° clockwise from the positive y-axis. What is the magnitude of this object's acceleration?
A) 1.1 m/s2 B) 1.3 m/s2 C) 1.5 m/s2 D) 1.7 m/s2
An adjustable bracket with a collar slides on a pole and is held in place by friction at A and B. The min- imum coefficient of static friction between the pole and collar so that the collar is self-locking against the pole under applied load F is:
(A) 0.25
(B) 0.31
(C) 0.42
(D) 0.83
