A CD has a diameter of 12.0 cm. If the CD is rotating at a constant frequency of 4.00 cycles per second, then the period of the rotational motion is
A. 0.250 s.
B. 0.500 s.
C. 0.750 s.
D. 1.00 s.
E. 1.25 s.
A. 0.250 s.
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The ecliptic passes through the zodiac
a. True b. False Indicate whether the statement is true or false
If you sit in a boat near the edge of a river channel, you might notice the water moving more quickly on the side away from the shore (the channel side). If you are initially moving with the river, you will be pushed
A. into the channel by the turbulent flow of the water. B. toward the shore because the water flow is laminar around the boat. C. toward the shore because the water pressure is smaller on the shore side. D. into the channel because the water pressure is larger on the shore side.
An electron of mass 9.11 × 10^–31 kg has a momentum of 2.61 × 10^–22 kg·m/s. What is its speed?
a. 0.29c b. 0.72c c. 0.69c d. 0.48c e. It cannot have this momentum since it would require a speed greater than c.
Shown are four figures that represent the heat flow in a heat engine. The thickness of the arrows represents the amount of heat flow. TH is the high-temperature reservoir, TC is the low-temperature reservoir, QH is heat to/from TH, QC is heat to/from TC, and W is work. Which figure best represents a real heat engine?
A. A B. B C. C D. D