A compact fluorescent lamp gives more light output for
A) less power.
B) the same power.
C) greater resistance.
Answer: A
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Magnetic Field of a Long Wire: The magnetic field at point P due to a 2.0-A current flowing in a long, straight, thin wire is 8.0 ?T. How far is point P from the wire? (?0 = 4? × 10-7 T ? m/A)
A. 2.0 cm B. 2.5 cm C. 4.0 cm D. 5.0 cm E. 10 cm
Ordinary matter contains only the following quarks.
A. Strange B. Bottom C. Down D. Charm
What is the main reason mountaintops are so cold?
A) The air is thinner at higher altitudes. B) Mountaintops are above much of the greenhouse gas in the atmosphere. C) The winds are stronger at higher altitudes. D) There is more water vapor at higher altitudes, causing there to be more snow. E) All of the above are true.
Doubling the distance between two objects halves the gravitational force between them
Indicate whether the statement is true or false