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7aCDW11quiz3

# 7aCDW11quiz3 - remain the same Circle your response...

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P7A Quiz3a DL Sec ___ Name ( last ) ______________________ ( first ) ___________________ I certify by my signature that I will abide by the code of academic conduct of the University of California. Signature ________________________________________ Rubric Codes: 1. 1kg of ice initially at T = -100°C is put in contact with a very large amount of liquid water at T = 0°C. Ice and water can exchange heat just with each other but not with the environment. a. [5 pts] Draw a complete energy interaction diagram that: i. describes the changes in all relevant energy systems and indicators for both the 1kg of ice and the very large amount of liquid water separately. ii. gives the initial and final values of the indicators, including the final equilibrium temperature of the system. b. [2 pts] Write down the equation expressing energy conservation and plug in the variables for each energy system (you don ʼ t need to plug in numbers). c. [3 pts] Did the total amount of ice in the final state increase, decrease, or

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Unformatted text preview: remain the same? Circle your response. increased The total amount of ice in the final state: decreased remained the same 2. a) [6 pts] Jim throws a baseball vertically upward from 1 meter above the ground and then lets the ball fall to the ground. Just after the baseball leaves Jim ʼ s hand (the initial state) it has a speed of 50 miles/hour. What is the speed of the baseball when it is on its way down and 1 meter above the ground (final state)? You may assume that the effects of friction and energy transfer to thermal systems are negligible. Explain your answer in terms of energy conservation. b) [2 pts] Does your answer to question 2a change if the situation is the same as 2a except the baseball has a mass that is twice as large? Circle Yes or No. Yes No c) [2 pts] Does your answer to question 2a change if the situation is the same as 2a except Jim throws the baseball at an angle of 45 degrees from vertical? Circle Yes or No. Yes No...
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