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1Physics clicker question: internal energy of different mass samples 1 Citation Physics 205A, Spring Semester 2009 Cuesta College, San Luis Obispo, CA Cf. Giambattista/Richardson/Richardson, Physics, 2/e , Conceptual Question 14.20 (extended) Students were asked the following clicker question (Classroom Performance System, einstruction.com ) at the start of their learning cycle: A 50 g iron sample and a 10 g iron sample are both at room temperature (25 degrees C). Which sample has more internal energy? (A) 50 g iron sample. (B) 10 g iron sample. (C) (There is a ti, technorati.com
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1 Citation When we previously derived the ideal gas law PV = NkT = nRT from a particle bouncing in a box, we used the Maxwell speed distribution , which was in turn derived using the Boltzmann factor with regards to the kinetic energy of the translational motion of the molecules. Now, if we want to consider the internal energy U of the gas, and the properties deriving from it, such as specific heat capacity, we must consider not only the translatation of the molecules, but also other possible mot, technorati.com
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1 Citation Apr.19, 2009 in UncategorizedADVERTISEMENTS A 111.6 g sample of iron (MW = 55.8) was heated from 0?C to 20?C. It absorbed 1004 J of energy. What is the molar heat capacity of iron? a. 50.2 J/K?mol b. 251 J/K?mol c. 502 J/K?mol d. 25.1 J/K?mol ADVERTISEMENTSTags: molar heat capacity, technorati.com
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When 23.9 g of Iridium at 89.70C is added to 20.0 g of water at 20.1 0C? 1 Citation Apr.13, 2009 in UncategorizedADVERTISEMENTSWhen 23.9 g of Iridium at 89.70C is added to 20.0 g of water at 20.1 0C, the final temperature is 22.6 0C. What is the specific heat capacity of Iridium? (the specific heat capacity of H2O = 4.184 J/g. 0C)Please help solve this question. Thanks!!!!!!!!!!!!!!!!!!!!!!!Thanks!!!!!!!!!!!!!!!!!!!!!!!1 ADVERTISEMENTSTags: iridium, question thanks, specific heat capacity, technorati.com
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What quantity of coal in grams must be burned to heat 500.0 g of water from 20.0 °C to 95.0 °C? 1 Citation Apr.07, 2009 in UncategorizedADVERTISEMENTSThe heat of combustion for a sample of coal is 23.0 °C KJ/g. What quantity of coal in grams must be burned to heat 500.0 g of water from 20.0 °C to 95.0 °C. The specific heat capacity of water is 4.184 J-1 °C-1 g. ADVERTISEMENTSTags: coal, heat capacity of water, heat of combustion, kj, specific heat capacity, specific heat capacity of water, technorati.com
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1 Citation For an ideal gas of N molecules, each with f total available degrees of freedom for each molecule ( f ?3), we have equation of state and internal energy , as discussed here and here . Now, we can use this to find the heat capacity for a given quantity of an ideal gas. The heat capacity is defined as the ratio of a small amount of heat (energy) added to the body to the resulting small temperature increase, with the system under some constraint (to define a particular path through the, technorati.com
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1 Citation Previously , I discussed the heat capacity of an ideal gas, and the relationship to the molecular degrees of freedom f . Now, another important property for a gas is the ratio of the specific heat for constant pressure to that for constant volume, known as the heat capacity ratio, or adiabatic index: . Recalling the derivation of the specific heats from the internal energy and enthalpy, we see that for an ideal gas, we can also express the adiabatic index as . Recalling that in terms of, technorati.com
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Physics final exam question: icy lake versus hot teapot 1 Citation Physics 205A Final Exam, Spring Semester 2009 Cuesta College, San Luis Obispo, CA Cf. Giambattista/Richardson/Richardson, Physics, 2/e , Conceptual Question 14.20 Which possesses more total internal energy, the water within a large, partially ice-covered lake in winter, or a 6-cup teapot filled with hot tea? Explain using the properties of heat and internal energy? Solution and grading rubric: p = 10/10: Correct. At absolute zero (0 kelvins), there is zero total internal ene, technorati.com
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Physics final exam question: kelvins versus Celsius degrees 1 Citation Physics 205A Final Exam, Spring Semester 2009 Cuesta College, San Luis Obispo, CA Cf. Giambattista/Richardson/Richardson, Physics, 2/e , Conceptual Question 13.3 Are there any special circumstances that kelvins or Celsius degrees can be used interchangeably? Explain your answer using the properties of heat and temperature. Solution and grading rubric: p = 10/10: Correct. Kelvins or Celsius degrees can be used interchangeably if changes in temperatures (delta(T)) are involved, technorati.com
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1 Citation Heat Capacity is the capacity of a body to store heat. It is measured in energy units per temperature units, or J/°C. Time out professor.. Please explain. OK, but first let's define specific heat capacity (C p ). Specific heat capacity is defined by how much heat you have to add or remove from an object to change its temperature. Essentially heat capacity can be understood as how well an object can maintain its temperature compared to other objects. Let's look at specific heat capacities (J mo, technorati.com
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