# SupplementAnswers 2011 - Supplemental Problems for Physics...

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Chapter 1 1. a) Decreasing energy systems: Eth of steam, Eb of steam, Eth of condensed water. Increasing energy systems: Eth of ice, Eb of ice, Eth of melted water. b) The overall bond energy decreased, since for the ice, Eb = (0.005kg)(333.5kJ/kg) = 1.67 kJ, while for the steam: Eb = -(0.001kg)(2257kJ/kg) = -2.3kJ. 2. Disagree. It takes energy to break bonds. 3. Heat of vaporization is greater. Heat of vap = 450 J , and Heat of melting = 300 J. Slope = Δ T/Q = 1/C. Smallest slope will have largest Heat Capacity. Answer: Liquid. Chapter 2 1. KE (initial) + PEgrav (initial) + PEmass-spring (initial) = KE(final) + PEgrav (final) + PEmass/spring (final). 1/2(0.02 kg) · Vi 2 + 0.4 J = 0.5 J. So, Vi = 3.16 m/s. 2. The Red Line is PE (is always negative) : PEmax = 0 J at y = 0 m. PEmin = -5 J at y = -5 m. The Blue Line is KE (is always positive) : KEmax = 5 J at y = -5 m. KEmin = 0 J at y = 0 m. Y(m)

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## SupplementAnswers 2011 - Supplemental Problems for Physics...

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