The Cretaceous is a(n)
a. epoch.
b. era.
c. eon.
d. period.
d
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How many different kinds of leptons are known to exist, including antiparticles as different kinds?
A) 12 B) 4 C) 2 D) 8 E) 6
A 6.00 kg mass is located at (2.00 m, 2.00 m, 2.00 m) and a 5.00 kg mass is located at (–1.0 m, 3.00 m,–2.00 m). If this system of masses rotated about the X-axis perpendicular to the Z-Y plane, then the moment of inertia of this system is
A. 281 kg 
B. 167 kg
C. 113 kg
D. 85 kg
E. 69 kg
A natural gas pipeline with a diameter 0.250 m delivers 1.55 cubic meters of gas per second. What is the flow speed of the gas in the pipeline?
What is the Oort cloud?
A. the glowing light around a meteor as it burns up B. a region in the outer Solar System from which comets come C. the gas boiled off a comet that forms its tail D. a zone between the Sun and Mercury where comets burn up and release their gases E. gas around a comet's head