An unclad optical fiber has index of refraction 1.70 . What is the acceptance angle for this fiber? The acceptance angle is the greatest angle at which the light enters the end of the fiber and still causes total internal reflection
a. 38.7°
c. 39.7°
b. 51.3°
d. Any angle will be accepted.
D
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How does a particle’s relativistic kinetic energy K compare to its Newtonian kinetic energy when the particle’s speed 
?
A. 
B. 
C.
State Kepler's third law
What will be an ideal response?
A rod of length L is pivoted about its left end and has a force F applied perpendicular to the other end. The force F is now removed and another force F¢ is applied at the midpoint of the rod. If F¢ is at an angle of 30o with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied?
a. F c. 3F b. 2F d. 4F
The position x, in meters, of an object is given by the equation x = A + Bt + Ct2, where t represents time in seconds. What are the SI units of A, B, and C?
A) m, s, s2 B) m/s, m/s2, m/s3 C) m, s, s D) m, m, m E) m, m/s, m/s2