A child pulls on a wagon with a horizontal force of If the wagon moves horizontally a total of in what is the average power generated by the child?
A) 18 W
B) 22 W
C) 24 W
D) 27 W
Answer: A
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There are several elements that we regard as semiconductors. The common property of these elements is that they have
A. outer electrons which cannot move. B. electrons, which are randomly organized about the nucleus. C. no electrons beyond a closed shell. D. four outer electrons beyond a closed shell.
A magnetic dipole antenna is set up due west of a radio installation that utilizes an electric dipole antenna as a transmitter. What should the orientation of the antenna be used?
A. east-west B. horizontal C. north-south D. Unable to answer given the information. E. vertical
In part (a) of this figure, three identical, equally spaced objects are dropped. In part (b), the two green blocks are moved closer together before they are dropped. In part (c), the two green blocks are combined to form one larger block. Contrasting Galileo's and Aristotle's views, what is the most plausible statement about the speed of the large green block compared with that of the small red
block? a. The green block must fall faster because it is more massive. b. The green block can be seen as two side-by-side smaller blocks falling at the same rate, hence the larger and smaller blocks fall at the same rate. c. The larger and smaller blocks fall at the same rate only in a vacuum. d. The larger block speeds up the fall of the lighter block, but only if they are tied together. e. The lighter block slows the fall of the heavier block, but only if they are tied together.
Beautiful cone-shaped volcanoes such as Mt. Fuji, Mt. Hood, and Mt. Rainer are predominantly composed of
A) basaltic rocks. B) andesitic rocks. C) granitic rocks.