The radius of a sphere is 2.00 m. The surface area of the sphere is

A. 36.7

B. 50.3

C. 72.5

D. 75.0


B. 50.3

Physics & Space Science

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A 0.40 H inductor has a current that rises from zero to 3.0 A in 6.0 s. What is the average power required to accomplish this?

A. 15 W B. 9.0 W C. 1.5 W D. 0.60 W E. 0.30 W

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Temperature Scales: Which two temperature changes are equivalent?

A. 1 K = 1 F° B. 1 F° = 1 C° C. 1 C° = 1 K D. None of these

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The diagram shows a planet at four positions in its orbit. At which position does it have the greatest gravitational potential energy?

A) 1 B) 2 C) 3 D) 4 E) The gravitational potential energy is the same at all four positions.

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How can astronomers currently determine the temperature of an extrasolar planet?

A) estimate the temperature based on the planet's distance from the star B) measure the drop in total infrared light when the planet passes behind the star from our perspective C) use spectroscopy of the planet to identify the wavelength at which its emission peaks D) A and B E) B and C

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