The average value of 
t for a complete cycle is
A. 1.
B. 0.
C. 0.707.
D. 0.500.
E. 0.250.
D. 0.500.
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Earth's internal layers were discovered by studying the propagation of P- and S- waves through Earth's interior. In comparison to P-waves, the movement of S-waves are
A) faster and compresses and expands the rock as they move through it. B) faster and vibrates rock particles up and down and side-to-side. C) slower and can travel through solid granite, magma, water or air. D) slower and they can only travel through solids, not liquids.
Velocity: A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
A. 45 mph B. 50 mph C. 52.5 mph D. 55 mph E. 60 mph
Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity at the observer is a maximum. What is the axis angle settings of polarizer B?
A. 0° B. 25° C. 50° D. 75° E. 100°
Comets belong to the ________.
A. dwarf planets and Asteroid belt B. Asteroid belt and Kuiper belt C. Kuiper belt and Oort cloud D. Oort cloud and dwarf planets E. None of these choices is correct.