Graphical Analysis: A child standing on a bridge throws a rock straight down. The rock leaves the child's hand at time t = 0 s. If we take upward as the positive direction, which of the graphs shown below best represents the acceleration of the stone as a function of time?
A. A
B. B
C. C
D. D
E. E
Answer: B
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The slope of a line connecting two points on a velocity versus time graph gives
A) displacement. B) instantaneous velocity. C) average velocity. D) instantaneous acceleration. E) average acceleration.
Polarized light is to have its polarization plane rotated by 90°. In which of the following cases does the final beam have the greatest intensity? a. 3 polarizing filters, each rotate beam by 30°
b. 2 polarizing filters, both rotate beam by 45°. c. 1 polarizing filter, rotating beam by 90°. d. None of the above, polarized light can't be rotated.
The standard unit of time in the mks system is the
a. meter b. kilogram c. second d. minute e. microsecond
Are you reading the Energy Guide material on the appliances you purchase? Do you look for the Energy Star label? Why or why not? Do you think you should if you don't? Do you think it's helped if you do? Explain your answer
What will be an ideal response?