Entropy: What is the change in entropy of the ice when a 0.050-kg ice cube at 0°C melts? The latent heat of fusion for water is 80 cal/g.

Fill in the blank(s) with the appropriate word(s).


15 cal/K

Physics & Space Science

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What holds the Sun together?

A. its gravitational force B. gas pressure. C. electrostatic forces between ions in its interior D. Nothing, the Sun is actually expanding very slowly.

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Neglecting air resistance, Sammy Smarts on a high ladder releases a ball that strikes the ground with 100 J of kinetic energy. If he were to instead throw the ball straight upward, it will soon reach the ground with a kinetic energy of

A) less than 100 J. B) 100 J. C) more than 100 J.

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Like other solid bodies in the solar system, Earth's surface was kept molten by

A) radioactivity. B) differentiation. C) convection. D) bombardment by small bodies. E) the solar nebula.

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Which of the following statements best describes the line of stability?

a. It has N = Z when A = 240. b. It has Z > N at A = 240 c. N always tends to be greater than Z. d. N tends to be greater than Z, especially for masses greater than calcium.

Physics & Space Science