A spherical rock has a density of 3 g/cm3. If another rock has the same mass but is twice as wide, its density must be ________ g/cm3.
A. 6
B. 3/8
C. 3/4
D. 3/2
Answer: B
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Ancient astronomers often had difficulty explaining _____, the occasional westward motion of the planets
a. parallax b. eccentrics c. retrograde motion d. deferents e. epicycles
Addition by 1. Components: Vector 
has a magnitude of 8.0 m and points 30° north of east; vector 
has a magnitude of 6.0 m and points 30° west of north; and vector 
has a magnitude of 5.0 m and points 30° west of south. The resultant vector 
+ 
-5.0px;" /> + 
is given by
A. 2.7 m at an angle 74° north of east.
B. 5.9 m at an angle 74° north of east.
C. 4.8 m at an angle 74° east of north.
D. 5.1 m at an angle 74° north of east.
E. 2.1 m at an angle 66° east of north.
HDTV is now being introduced in the U.S. It is likely that sales of HDTVs will follow an exponential growth curve during the earliest years of sales
What will be an ideal response?
How much power is theoretically available from a mass flow of 1 000 kg/s of water when it falls a vertical distance of 100 meters?
a. 980 kW b. 98 kW c. 4 900 W d. 980 W e. 9 600 W