Instructions: On occasion, the notation 
= [A, ?] will be a shorthand notation for 
.
Dana says any vector 
can be represented as the sum of two vectors: 
. Ardis says any vector can be represented as the difference of two vectors: 
. Which one, if either, is correct?
A.
B.
C.
D.
.E.
Answer: D
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A uniform rod (length = 2.4 m) of negligible mass has a 1.0-kg point mass attached to one end and a 2.0-kg point mass attached to the other end. The rod is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through a point 1.0 m from the 2.0-kg mass. The rod is released from rest when it is horizontal. What is the angular velocity of the rod at the
instant the 2.0-kg mass passes through its low point? a. 1.7 rad/s b. 2.2 rad/s c. 2.0 rad/s d. 1.5 rad/s e. 3.1 rad/s
What is the approximate diameter of Earth in miles given the information provided in the figure caption: "Earth spills over the edges of this photograph at a scale of 10^7 meters"?
a. 10,000 mi b. 6,000 mi c. 3,000 mi d. 1,000 mi
The SI units of velocity are
a. mi/h. b. km/h. c. m/s2. d. m/s. e. none of the above
The lunar surface cools after the Sun sets. This is an example of
a. heat conduction. b. heat convection. c. heat radiation. d. thermal expansion. e. none of the above.