The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. The minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image is
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
c
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Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) We have identified fossils of the first life forms that ever existed on Earth. B) All life uses DNA and the same genetic code. C) Mapping of gene sequences shows how life is all related. D) All life builds proteins from the same amino acids and uses ATP to store energy in cells.
A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm in the +x direction away from its equilibrium point and then released from rest at t = 0, what is the initial phase ?
A. 0
B. 
C. 
D. 
E. 
F. Some other result (specify)
If you wish to spear a small blue fish with a red laser beam, you should compensate for refraction and aim your laser
A) directly at the sighted fish. B) above the sighted fish. C) below the sighted fish.
Which of the following is true?
1.A moving car with constant acceleration can never stop and stay stopped. 2.If a car is traveling eastward, its acceleration is eastward. 3.If a car is slowing down, its acceleration must be negative. 4.If a car is speeding up, its acceleration must be greater than zero.