If the scalar (dot) product of two vectors is negative, it means that
a. there was a calculator error.
b. the angle between the vectors is less than 90 degrees.
c. the angle between the vectors is 90 degrees.
d. the angle between the vectors is greater than 270 degrees.
e. the angle between the vectors is between 90 and 180 degrees.
e
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Do the constellations visible in the sky at a particular time of night (say 9 P.M.) follow a seasonal pattern?
a. No, the same constellations are visible at 9 P.M. on any clear night of the year. b. No. As the year progresses, the constellations visible at 9 P.M. are the same but their shapes change. c. Yes, at 9 P.M. during a clear winter night ALL of the constellations you can see are different from the ones that appear at the same time during a summer night. d. Yes, at 9 P.M. during a summer night most of the constellations you can see are different from those you can see on a winter night. However, there are some constellations that are visible all year long.
In an attempt to avoid “the bends” which occurs if a diver rises too quickly after having been at great depth in the ocean for a long period of time, a diver should come to the surface relatively slowly. What would the rate of change (in Pa/s) of the water pressure be on a diver in the ocean as he rose at 15 m/min? The density of seawater is 1017 
A. 15 kPa/s B. 2.5 kPa/s C. 250 Pa/s D. 150 kPa/s
Although most astronomers assume dark matter really exists, there is at least one other possible explanation for the phenomena attributed to dark matter. What is it?
A) There could be something wrong or incomplete with our understanding of how gravity operates on galaxy-size scales. B) The so-called dark matter is really just ordinary stars that are enshrouded in clouds of dust. C) We could just be having a hard time understanding the observations, because they involve very distant galaxies. D) There could be something wrong with our understanding of how atoms produce light.
If a virtual image is formed 14.5 cm along the principal axis from a convex mirror of focal length –19.5 cm, how far is the object from the mirror?
a. 56.6 cm b. 14.5 cm c. 5.00 cm d. 20.0 cm e. 6.80 cm