If Saturn takes about 30 years to orbit the Sun, and its rings were seen edge-on in 1995, when did they next appear most open at solstice?
A) 2007 B) 2005 C) 1998 D) 2010 E) 2002
E
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If the average density of matter and energy in the Universe is more than the critical density, space-time will be _____
A) closed B) flat C) open D) infinite
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.
A future astronaut exploring Mars would
A) need to stay inside a spacecraft at all times B) be able to walk on the surface at any time wearing only warm clothing C) need to wear a spacesuit at all times D) need to wear a spacesuit only during the winter
A charge Q is uniformly distributed throughout a nonconducting sphere of radius R. The charge density in the sphere is
What will be an ideal response?