Approximately how long does it take for light to travel one foot?
A. 1 ms
B. 
C. 1 ns
D. 1 ps
E. 1 fs
C. 1 ns
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Magnetic Field of a Long Wire: A long, straight, horizontal wire carries current toward the east. An electron moves toward the east alongside and just south of the wire. What is the direction of the magnetic force on the electron?
A. toward the north B. toward the south C. upward D. downward E. toward the west
The monthly (30 days) electric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.0 hr/day
How much did these items contribute to the cost of the monthly electric bill if electricity costs 8.0ยข per kWh? A) $21.30 B) $39.50 C) $31.20 D) $13.20 E) $12.30
The characteristic that distinguishes fermions from bosons is
A) their mass. B) their electric charge. C) their spin. D) their size. E) their speed of travel.
Earth's axis completes a precession every
a. 25,800 years. b. 30 days. c. day. d. 365 days.