Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. Light is shown on the end of the fiber at an angle of 
relative to the fiber’s axis. What is the maximum angle with respect to the axis that light can be incident upon the fiber’s end and be fully transmitted along the fiber thanks to total internal reflection at the fiber/cladding interface?
A. 
B. 
C. 
D. 
E. 
F. 
A.
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These four photos shows features of Earth that change with time, some fast and some slow.. Which of these features could not exist if Earth did not have a magnetic field?
Star A and star B have the same temperature, but star B is more luminous than star A. What can you infer about these two stars?
A) Star A must be bigger. B) Star B must be bigger. C) Star A must be redder. D) Star B must be redder. E) Nothing can be inferred from the information given.
Contrast the orbits of asteroids and Kuiper Belt bodies
What will be an ideal response?
The acceleration due to gravity is 10 m/sec2. If an object falls from rest, its instantaneous speed at the end of the fifth second is (neglecting air resistance)
A) 10 m/sec. B) 5 m/sec. C) 100 m/sec. D) 50 m/sec. E) impossible to determine from the given information.