Which of the following represents the smallest range of temperatures?
A) 50-100° Kelvin
B) 50-100° Celsius
C) 50-100° Fahrenheit
D) They all represent the same range in temperature.
C) 50-100° Fahrenheit
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Potential Energy: A +3.0-µC point charge is initially extremely far from a positive point charge Q. You find that it takes 41 J of work to bring the +3.0-µC charge to the point x = 3.0 mm, y = 0.0 mm and the point charge Q to the point x = -3.0 mm, y = 0.00 mm. What is Q? (k = …)
A. 55 nC B. 9.1 µC C. 4.6 µC D. 27 pC
Both a 50-kg sack is lifted 2 meters from the ground and a 25-kg sack is lifted 4 meters in the same time. The power expended in raising the 50-kg sack is
A) twice as much as the 25-kg sack. B) half as much as the 25-kg sack. C) the same. D) need more information
Typically a granule in the photosphere is about
A) the size of Texas, about 1,000 km across. B) the size of our Moon, about 3,000 km across. C) as big as Jupiter, around 100,000 km wide. D) the size of Earth, around 12,000 km across. E) the size of a city, 20-30 kilometers across.
The lowest possible value for the index of refraction is:
a. 0. c. 0.707. b. 1. d. 3-1/2.