Is the "sports wave" that crowds perform at sports arenas really a "wave" as physicists define the term?
A) Yes, because a disturbance does move from one point to another without a corresponding transfer of matter, and this is what we mean by a "wave" in physics.
B) Yes, because energy does move through the crowd from one point to another, and this is what we mean by a "wave" in physics.
C) No, because there is no real physical connection between the different parts of the medium.
D) No, because spectators have free will--that is, they are not really forced to stand up and participate.
E) No, for both the reasons stated in answers C and D.
A
You might also like to view...
What does the equivalence principle say?
A) Gravity is the same thing as curvature of spacetime. B) The effects of gravity are exactly equivalent to the effects of acceleration. C) You cannot distinguish between motion at constant velocity and weight in a gravitational field. D) The effects of relativity are exactly equivalent to those predicted by Newton's laws of motion. E) All observers must always measure the same (equivalent) weights for moving objects.
Force F (see figure) is applied at C and is directed toward A. Its magnitude is F = 15 N. A unit vector along line CA is:
(A) -0.49i + 0.81j + 0.32k
(B) -0.5li + 0.73j + 0.39k
(C) 0.58i - 0.79j + 0.49k
(D) -0.65i + 0.22j + 0.43k
Which of the following is a form of high-level nuclear waste?
A) used nuclear fuel rods B) used water that has been circulating through the core of a reactor C) used protective clothing that has been worn by some nuclear power plant workers D) All of the above. E) None of the above.
Vision Problems: A machinist with normal vision has a near point at 25 cm. This machinist wears +4.25-diopter eyeglasses in order to do very close work. With these eyeglasses, what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes.
A. 12 cm B. 10 cm C. 7 cm D. 15 cm E. 17 cm