Consider the following statement, and explain whether or not it is sensible: The universe is between 10 and 16 billion light-years old
What will be an ideal response?
This statement does not make sense because it uses the term light-year as a length of time, rather than as a distance.
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Why is the Chandra X-ray Observatory critical to mapping intracluster gas?
What will be an ideal response?
What is the direction of the electric field vector 
at point P in the situation shown below? (Assume that the balls are actually point particles, they are equally spaced, and that the negative particles are equidistant from P.)
A. A
B. B
C. C
D. D
E. zero
F. Other
G. AA
H. BB
I. CC
J. DD
The amount of light received at Earth from a star is called luminosity
a. True b. False Indicate whether the statement is true or false
A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed. B) It is impossible to tell from the information given. C) the ball D) the stone