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Caps Lo ENGG 112 – THERMODYNAMICS QUESTION SHEET #1 – CONSERVATION OF ENERGY Ctrl This sheet involves topics covered in weeks 2 & 3. Before attempting these questions, you should work through Unit 1 in CANVAS. These questions are provided to allow you to evaluate your knowledge and understanding; hence, numerical answers are given but not solutions. A worked example is available in Unit 1, activity 1.7 and many more can be found in standard textbooks on thermodynamics". The formula page on the reverse of this sheet will be provided in the examination. A bottle of water rolls down a slope, hits a wall and comes to a stop 16m vertically below its original position. The bottle is of negligible mass and contains 1.5 litres of water of which 2% escapes during the process because the bottle-top is not screwed tightly closed. 1. Draw of sketch showing the position of the bottle at the start and end of the process and the other relevant information. Write down the first law of thermodynamics for a generalised system and identify those terms that do not apply to this process. Determine the change in internal energy of the bottle during the process. Assume the internal energy of water is 84 kJ/kg. (a) (b) (c) [Answer: 2280 J] Heat is transferred through the wall of a vertical cylinder to air trapped inside it by a

Caps Lo ENGG 112 – THERMODYNAMICS QUESTION SHEET #1 – CONSERVATION OF ENERGY Ctrl This sheet involves topics covered in weeks 2 & 3. Before attempting these questions, you should work through Unit 1 in CANVAS. These questions are provided to allow you to evaluate your knowledge and understanding; hence, numerical answers are given but not solutions. A worked example is available in Unit 1, activity 1.7 and many more can be found in standard textbooks on thermodynamics". The formula page on the reverse of this sheet will be provided in the examination. A bottle of water rolls down a slope, hits a wall and comes to a stop 16m vertically below its original position. The bottle is of negligible mass and contains 1.5 litres of water of which 2% escapes during the process because the bottle-top is not screwed tightly closed. 1. Draw of sketch showing the position of the bottle at the start and end of the process and the other relevant information. Write down the first law of thermodynamics for a generalised system and identify those terms that do not apply to this process. Determine the change in internal energy of the bottle during the process. Assume the internal energy of water is 84 kJ/kg. (a) (b) (c) [Answer: 2280 J] Heat is transferred through the wall of a vertical cylinder to air trapped inside it by a

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Caps Lc ENGG 112 – THERMODYNAMICS QUESTION SHEET #1 – CONSERVATION OF ENERGY Ctrl This sheet involves topics covered in weeks 2 & 3. Before attempting these questions, you should work through Unit 1 in CANVAS. These questions are provided to allow you to evaluate your knowledge and understanding; hence, numerical answers are given but not solutions. A worked example is available in Unit 1, activity 1.7 and many more can be found in standard textbooks on thermodynamics. The formula page on the reverse of this sheet will be provided in the examination. A bottle of water rolls down a slope, hits a wall and comes to a stop 16m vertically below its original position. The bottle is of negligible mass and contains 1.5 litres of water of which 2% escapes during the process because the bottle-top is not screwed tightly closed. 1. Draw of sketch showing the position of the bottle at the start and end of the process and the other relevant information. Write down the first law of thermodynamics for a generalised system and identify those terms that do not apply to this process. Determine the change in internal energy of the bottle during the process. Assume the internal energy of water is 84 kJ/kg. (a) (b) (c) [Answer: 2280 J] Heat is transferred through the wall of a vertical cylinder to air trapped inside it by a
Transcribed Image Text:Caps Lc ENGG 112 – THERMODYNAMICS QUESTION SHEET #1 – CONSERVATION OF ENERGY Ctrl This sheet involves topics covered in weeks 2 & 3. Before attempting these questions, you should work through Unit 1 in CANVAS. These questions are provided to allow you to evaluate your knowledge and understanding; hence, numerical answers are given but not solutions. A worked example is available in Unit 1, activity 1.7 and many more can be found in standard textbooks on thermodynamics. The formula page on the reverse of this sheet will be provided in the examination. A bottle of water rolls down a slope, hits a wall and comes to a stop 16m vertically below its original position. The bottle is of negligible mass and contains 1.5 litres of water of which 2% escapes during the process because the bottle-top is not screwed tightly closed. 1. Draw of sketch showing the position of the bottle at the start and end of the process and the other relevant information. Write down the first law of thermodynamics for a generalised system and identify those terms that do not apply to this process. Determine the change in internal energy of the bottle during the process. Assume the internal energy of water is 84 kJ/kg. (a) (b) (c) [Answer: 2280 J] Heat is transferred through the wall of a vertical cylinder to air trapped inside it by a
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