An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead
C
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Coulomb's Law: Three point charges are located on the x-axis at the following positions: Q1 = +2.00 ?C is at x = 1.00 m, Q2 = +3.00 ?C is at x = 0.00, and Q3 = -5.00 ?C is at x = -1.00 m. What is the magnitude of the electric force on Q2? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 0.0540 N B. 0.135 N C. 0.158 N D. 0.0810 N E. 0.189 N
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Vectors 
and 
have equal magnitudes. Which statement is always true?
A.
+ = 0B.
- = 0C.
is perpendicular to + .D.
is perpendicular to+.E.
+ equals the magnitude of .One theory for the origin of life suggests that life was transported to Earth in meteorites. This is referred to as
A) naturism B) intelligent design C) panspermia D) chemical evolution
A 100 million-year-old open cluster will no longer contain any O-type stars
Indicate whether the statement is true or false