Which of the following is NOT an example of a demographic characteristic?
A. gender
B. purchasing preferences
C. age group
D. income
Answer: B
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If the speed of a wave on a violin string is 400 m/s, what will be the speed of the wave if the tension in the string is halved?
a. 100 m/s b. 200 m/s c. 280 m/s d. 570 m/s
A ball falls to the ground from height h and bounces to height h'. Momentum is conserved in the ball-earth system
a. no matter what height h' it reaches. b. only if h' < h. c. only if h' = h. d. only if h' > h. e. only if h' ? h.
When a beam of nuclear radiation of initial intensity I0 passes through a thickness x of material, the intensity of the beam exiting the material is I =
a. I0e??x. b. I0e?x. c. I0(e??x ? 1). d. I0(e?x ? 1). e. I0(1 ? e??x).
Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?
a. Frank, because the centrifugal force is no longer counteracted by the string. b. Frank, because balls naturally fly straight out. c. John, because there is no centrifugal force. d. John, because balls fall straight down when released. e. Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.