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.
b
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A 4.00 kg mass is moving in a circular path of radius 4.10 m with a constant angular velocity of 5.00 rad/sec. The centripetal force on the mass is
A. 267 N. B. 294 N. C. 302 N. D. 350 N. E. 410 N.
The thermal conductivity of copper is 397 J/s/m/°C and of silver is 427 J/s/m/°C. A rod of each material is used as a heat conductor. If the rods have the same geometry and are used between the same temperature differences for the same time interval, what is the ratio of the heat transferred by copper to the heat transferred by the silver?
a. 0.930 b. 1.395 c. 2.093 d. 0.465 e. 0.791
Cepheids and globular clusters are limited in their ability to measure the distance to galaxies because they ____
a. are too rare b. are not bright enough to detect at large distances c. behave differently in other galaxies than they do in our own d. do not appear in dwarf galaxies e. are only found in elliptical galaxies
The number of nodes, including the end points, in a standing wave that is three wavelengths long is
A) 4. B) 5. C) 6. D) 7. E) none of the above