7. Suppose identical amounts of heat transfer into different masses of copper and water, causing identical changes in temperature. What is the ratio of the mass of copper to water?
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- 4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?Q2. Calculate the rate of heat conduction out of the human body, assuming that the core internal temperature is 37.0C , the skin temperature is 34.0C , the thickness of the tissues is about 2cm, and the surface area is 2 m^2. How much heat is lost in one hour?[thermal conductivity of human skin = 0.2 J/(s m C) ]10. If it takes 554 calories to increase the temperature of 100 grams of a substance by 60.0 degrees Celsius then how many calories does it take to raise the temperature of 600 grams of the same substance by 60.0 degrees Celsius? No phase changes occur. a. 13300 b. 554 c. 3324
- 5. A storage tank contains mass M of oxygen (O₂) at an absolute pressure of P and temperature T. Another tank of the same volume contains the same mass of CO₂ at the same pressure. What is the temperature in the CO₂ tank? (The combined numbers of protons and neutrons in atoms of C and O are 12 and 16, respectively. Do not use moles!).1. An expensive vacuum system can achieve a pressure as low as 1.83 ✕ 10−7 N/m2 at 26°C. How many atoms are there in a cubic centimeter at this pressure and temperature? 2. The number of kilocalories in food is determined by calorimetry techniques in which the food is burned and the amount of heat transfer is measured. How many kilocalories per gram are there in a 4.80 g peanut if the energy from burning it is transferred to 0.600 kg of water held in a 0.130 kg aluminum cup, causing a 44.0°C temperature increase?Double-glazed windows are usually made of two glass panes with a thin layer of air sealed between the panes. a. Why do these windows reduce heat loss to a much greater extent than occurs if the double glazing is replaced by a thicker glass instead? b. Why does the insulating effect of the double glazing decrease if the two glass panes are too far apart? Explain.
- 0.4 kg water is at room temperature 23 degrees in an aluminum container. An unknown metal with 0.5 kg mass is placed inside the water raising its temperature to 40 degrees. A)What is the specific heat of the unknown metal. B) Would the equilibrium temperature greater, less or the same if the system was not properly isolated.3. 120 grams of water are heated from zero degrees Celsius to 30.0 degrees Celsius. Which expression should be used to determine the amount of calories added to the water to do this? The latent heat of fusion of ice is 79.7 cal/gram, and the specific heat of water is 1 cal/gramCo. a. 120 b. 120 x 1 x 30 c. 120 x 79.7 d. 30 divided by 120 e. 120 divided by 30