Current: A current of 5.0 A flows through an electrical device for 10 seconds. How many electrons flow through this device during this time? (e = 1.60 × 10-19 C)
A. 0.20
B. 20
C. 2.0
D. 3.1 × 1020
E. 31 × 1020
Answer: D
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Center of Mass: The center of mass (or center of gravity) of a two-particle system is at the origin. One particle is located at (3.0 m, 0.0 m) and has a mass of 2.0 kg. The other particle has a mass of 3.0 kg. What is the location of the 3.0-kg particle?
A. (-3.0 m, 0.0 m) B. (-2.0 m, 0.0 m) C. (2.0 m, 0.0 m) D. (3.0 m, 0.0 m)
Why do elliptical galaxies appear yellow or red in color?
A) They contain many nebulae that glow red in color. B) Their population is dominated by old, low-mass stars and old, red giant stars. C) They are moving away from us so their light is highly redshifted. D) They contain vast amounts of dust that absorbs blue light.
A rabbit trying to escape a fox runs north for 8.0 m, darts northwest for 1.0 m, then drops 1.0 m down a hole into its burrow. What is the magnitude of the net displacement of the rabbit?
A) 8.8 m B) 8.1 m C) 66 m D) 10 m
At what frequency will a 20.00-mH inductor have an inductive reactance of 100.0 ??
A) 225.4 Hz B) 654 .8 Hz C) 795.7 Hz D) 457.4 Hz E) None of the other answers is correct.