A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km east, and then 1.0 km north to return to its starting point. This trip takes 45 min. What was the bear's average velocity?
A) 0.00 km/h
B) 0.067 km/h
C) 4.0 km/h
D) 5.3 km/h
A
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A 200-loop coil of cross sectional area 8.5 cm2 lies in the plane of the page. An external magnetic field of 0.060 T is directed out of the plane of the page. The external field decreases to 0.020 T in 12 milliseconds
(a) What is the magnitude of the change in the external magnetic flux enclosed by the coil? (b) What is the magnitude of the average voltage induced in the coil as the external flux is changing? (c) If the coil has a resistance of 4.0 ohms, what is the magnitude of the average current in the coil?
Why doesn't a small piece of uranium go naturally into a chain reaction?
a. Because none of its nuclei fission without bombardment from human-controlled sources. b. Because only large chunks of uranium do this naturally. c. Because in a small sample, too small a fraction of neutrons released from each fission are captured to trigger another reaction. d. Because a small piece of uranium is mostly uranium-238. e. Because even a small chunk is too large to sustain a chain reaction.
Reactance: At what frequency will a 14.0-mH coil have 14.0 ? of inductive reactance?
A. 1000 Hz B. 505 Hz C. 257 Hz D. 159 Hz
You're in a fast-moving train traveling at constant velocity. If you jump straight up you land
A) slightly ahead of your original position. B) at your original position. C) slightly behind your original position.