SupplementQuestions 2011

# SupplementQuestions 2011 - Supplemental Problems for...

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Chapter 1 1. An insulated box contains 5 g of ice at -10 o C. 1 g of steam at 110 o C is injected into the box. Once thermal equilibrium is achieved, the box is observed to contain only liquid water. For the following questions ignore any heat loss to the box or to the air in the box. a) List the energy systems you would need to consider to find the final temperature of the H 2 O. Clearly define the initial and final states and indicate whether these systems are increasing or decreasing. b) Did the overall Bond energy of the ice+steam system increase or decrease? Explain your answer. 2. A student who has not taken Physics 7A says that bonds store energy and release that energy when they break. Using any relevant concepts, models, and/or examples, explain whether you agree or disagree. 3. Heat is added to a sample of material at a constant rate. The sample starts off as a solid at a temperature of 60 K, and as heat is added the sample melts, and then vaporizes. The temperature as a function of energy added to the sample is shown on the plot. From the information provided, determine which is greater, the heat of vaporization or the heat of melting? Explain how you know. From the information provided, determine in which phase, solid, liquid or gas, the sample has the greatest heat capacity? Explain and support your answer with calculations. Supplemental Problems for Physics 7A v1.0; 10/2010

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Chapter 2 1. A Physics 7A student stands on a chair and throws a 20g stone straight up in the air. As she lets go of the stone her hand is 2m above the ground. The stone lands on a vertical spring attached to the ground, compressing it fully (10cm) and the stone comes to rest at ground level. The spring constant is 100 N/m = 100 J/m2. What was the original speed of the stone?
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