A bow wave is produced when a wave source moves
A) nearly as fast as the waves it produces.
B) as fast as the waves it produces.
C) faster than the waves it produces.
Answer: C) faster than the waves it produces.
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Consider the displacement vectors shown below.
a) Which vector (if any) is equal to 
?
(b) Which is not equal to but has the same magnitude?
(c) Which is equal to 
?
(d) Which is equal to 
?
Two cylinders made of the same material roll down a plane inclined at an angle ? with the horizontal. Each travels the same distance. The radius of cylinder B is twice the radius of cylinder A. In what order do they reach the bottom?
a. A reaches the bottom first because it has the greater acceleration. b. A reaches the bottom first because it has a smaller moment of inertia. c. B reaches the bottom first because is experiences a larger torque. d. B reaches the bottom first because it travels a larger distance in one rotation. e. They both reach the bottom at the same time, because each has the same linear acceleration.
Four amperes of current exist in the primary coil of a transformer. The voltage across the primary coil is 120 V. What is the power output of the secondary coil?
A) 30 W B) 120 W C) 480 W D) 960 W E) need more information
A nuclear reactor is said to be critical when the average number of neutrons from each fission event that cause(s) another fission event is
a. <1. b. 1. c. >1. d. any of the above. e. only (b) or (c) above.