Which of the following is a conversion from chemical energy to thermal energy? Coal is burned...
Which of the following is a conversion from chemical energy to thermal energy?
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Coal is burned to boil water. |
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Food is digested and used to regulate body temperature. |
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Charcoal is burned in a barbeque pit. |
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All of the above. |
Homework Answers
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Which of the following is a conversion from chemical energy to
thermal energy?
Coal is burned...
One tonne of coal, if fully burned, releases 28 Gigajoules (GJ) of thermal energy. However, for...
One tonne of coal, if fully burned, releases 28 Gigajoules (GJ) of thermal energy. However, for each tonne of coal burned in its boiler, a modern electrical power plant produces only 9.5 GJ of electrical energy. a) Which law of nature explains the difference? [1 Mark] b) What is the energy conversion efficiency of such a power plant? [1 Mark] c) If the electrical transmission and distribution network between the power plant and your home has an efficiency of 93%,...
Thermal question A 60-kg hiker plans to climb Mt Kosciuszko (2228 m) starting from Thredbo (1365m). Assume that she is 25% efficient at converting chemical energy from food into mechanical work,...
Thermal question
A 60-kg hiker plans to climb Mt Kosciuszko (2228 m) starting from Thredbo (1365m). Assume that she is 25% efficient at converting chemical energy from food into mechanical work, and that essentially all the work goes into the vertical climb. (a) (3 marks) With reference to the data above, how many servings of Nutrigrain should she eat to provide enough energy for the climb? (b) (6 marks) Climbing a mountain warms you up, and makes you sweat one...
MODEL 7-Conversion Factors from Other Concentration Units Conversion Factors Statement The average concentration of bromide ions...
MODEL 7-Conversion Factors from Other Concentration Units Conversion Factors Statement The average concentration of bromide ions in sea water is 67.3 10° g sea water 67.3 g Br 67.3 g Br 10° g sea water ppm 3.6 g K 1000 g banana 1000 g banana The average banana contains 3.6 ppt potassium 3.6 g K 10° gair 4.7 g H,S 10 g air The average human can detect H,S is air by smell at 4.7 ppb 4.7 g H,S Q42...
During a reaction, thermal energy from the environment is converted into chemical energy stored in the...
During a reaction, thermal energy from the environment is converted into chemical energy stored in the products. Which of the following can you determine? A. The reaction is single replacement. B. The reaction is exothermic. C. The reaction is a decomposition. D. The reaction is endothermic.
1. - peints My Notes Ask Your The figure below is from the Energy Forms PhET...
1. - peints My Notes Ask Your The figure below is from the Energy Forms PhET that we used in class. A. If the system is the biker, bike, wheel, electrical wire, and the water, select all statements that are true: (Select all that apply.) O Thermal energy is transferred out of the system. OMechanical energy is transformed to chemical energy within the system. Electrical energy is transferred out of the system. Electrical energy is transformed to thermal energy within...
While running, a 74 kg student generates thermal energy at a rate of 1300 W. To...
While running, a 74 kg student generates thermal energy at a rate of 1300 W. To maintain a constant body temperature of 37.0 ∘C, this energy must be removed by perspiration or other mechanisms. Part A If these mechanisms failed and the heat could not flow out of the student's body, for what amount of time could a student run before irreversible body damage occurred? (Protein structures in the body are damaged irreversibly if the body temperature rises to 44.0...
While running, a 78 kg student generates thermal energy at a rate of 1100 W ....
While running, a 78 kg student generates thermal energy at a rate of 1100 W . To maintain a constant body temperature of 40 ∘C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of the student's body, for what amount of time could a student run before irreversible body damage occurred? (Protein structures in the body are damaged irreversibly if the body temperature rises to 44 ∘C...
While running, a 76 kg student generates thermal energy at a rate of 1100 W ....
While running, a 76 kg student generates thermal energy at a rate of 1100 W . To maintain a constant body temperature of 36 ∘C, this energy must be removed by perspiration or other mechanisms. If these mechanisms failed and the heat could not flow out of the student's body, for what amount of time could a student run before irreversible body damage occurred? (Protein structures in the body are damaged irreversibly if the body temperature rises to 44 ∘C...
ethanol is 190 g E a 3) A coal-fired power plant is designed to produce 12...
ethanol is 190 g E a 3) A coal-fired power plant is designed to produce 12 MW of electricity. (This is a small unit that might be used to power a pulp-and-paper mill or other relatively energy intensive factory.) The coal is used to heat steam to a temperature of 560 C. After running through the turbines; the steam has been condensed and the liquid water cooled to 38 °C. (a) Calculate the minimum amount of heat that must be...
A bituminous coal is burned with air in a boiler furnace. The coal is fed at a rate of 40000 kg/h and has an ultimate analysis of 76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt% non-...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
Thermal question
A 60-kg hiker plans to climb Mt Kosciuszko (2228 m) starting from Thredbo (1365m). Assume that she is 25% efficient at converting chemical energy from food into mechanical work, and that essentially all the work goes into the vertical climb. (a) (3 marks) With reference to the data above, how many servings of Nutrigrain should she eat to provide enough energy for the climb? (b) (6 marks) Climbing a mountain warms you up, and makes you sweat one...
MODEL 7-Conversion Factors from Other Concentration Units Conversion Factors Statement The average concentration of bromide ions in sea water is 67.3 10° g sea water 67.3 g Br 67.3 g Br 10° g sea water ppm 3.6 g K 1000 g banana 1000 g banana The average banana contains 3.6 ppt potassium 3.6 g K 10° gair 4.7 g H,S 10 g air The average human can detect H,S is air by smell at 4.7 ppb 4.7 g H,S Q42...
1. - peints My Notes Ask Your The figure below is from the Energy Forms PhET that we used in class. A. If the system is the biker, bike, wheel, electrical wire, and the water, select all statements that are true: (Select all that apply.) O Thermal energy is transferred out of the system. OMechanical energy is transformed to chemical energy within the system. Electrical energy is transferred out of the system. Electrical energy is transformed to thermal energy within...
ethanol is 190 g E a 3) A coal-fired power plant is designed to produce 12 MW of electricity. (This is a small unit that might be used to power a pulp-and-paper mill or other relatively energy intensive factory.) The coal is used to heat steam to a temperature of 560 C. After running through the turbines; the steam has been condensed and the liquid water cooled to 38 °C. (a) Calculate the minimum amount of heat that must be...
A bituminous coal is burned with air in a boiler furnace. The
coal is fed at a rate of 40000 kg/h and has an ultimate analysis of
76wt% C, 5wt% H, 8wt% O, negligible amounts of N and S, and 11wt%
non-combustible ash. Air enters a preheater at 30 °C and 1 atm with
a relative humidity of 30%, exchanges heat with the hot flue gas
leaving the furnace and air enters the furnace at temperature Ta
(°C). The flue...
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