How much energy is radiated each second by one square meter of a star whose temperature is 10,000 K? s in the Stefan-Boltzmann law is equal to

,



a. 5.67 x 1012 J

b. 5.67 x 108 J

c. 5.67 x 104 J

d. 300 nm

e. 300,000,000 nm


B

Physics & Space Science

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A person with an initial mass of 70 kg climbs a stairway and thereby rises 6.0 m in elevation

By how much does his mass increase by virtue of his increased potential energy? (c = 3.0 × 108 m/s)

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The electric field associated with a uniformly charged hollow metallic sphere is the greatest at:

a. the center of the sphere. c. infinity. b. the sphere's outer surface. d. the sphere's inner surface.

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Calorimetry: If 50 g of lead (of specific heat 0.11 kcal/kg ? C°) at 100°C is put into 75 g of water (of specific heat 1.0 kcal/kg ? C°) at 0°C. What is the final temperature of the mixture?

A. 2.0°C B. 6.8°C C. 25°C D. 50°C

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