Calculate the current through a 10.0-m long 22 gauge (having radius 0.321 mm) nichrome wire if it is connected to a 12.0-V battery. The resistivity of nichrome is 100 × 10-8 ? ? m
A) 17.5 A
B) 30.9 A
C) 61.8 A
D) 388 mA
E) 776 mA
Answer: D
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If the temperature of the bubble described in problem T7T.8 was 320 K when it formed, what is its approximate final temperature when it reaches the surface?
A. 40 K B. 80 K C. 320 K D. 1280 K E. 2560 K F. Other (specify)
Astronomers believe that dark matter exists because
A. the galaxies in clusters move slower than expected on the basis of the material visible in them. B. they can detect it with radio telescopes. C. the outer parts of galaxies rotate faster than expected on the basis of the material visible in them. D. it is the only way to explain the black holes in active galaxies. E. All of these choices are correct.
An automobile (m = 1.00 × 10^3 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 10^6 N/m), and is observed to compress a distance of 3.16 cm as the car is brought to rest. What was the initial speed of the automobile?
The wavelength of a periodic wave is 0.800 m. If the frequency is 400 Hz, then what is the magnitude of the k vector of the wave?
A. 8.56 
B. 7.85
C. 7.02
D. 6.35
E. 5.98