Sustainable Energy
2nd Edition
ISBN: 9781337551663
Author: DUNLAP, Richard A.
Publisher: Cengage,
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6.0 g of cream at 13.2 °C are added to an insulated cup containing 150.0 g of coffee at 92.9 °C. Calculate the equilibrium temperature of the coffee.
You may assume no heat is lost to the cup or surroundings, and that any physical properties of cream and coffee you need are the same as those of water.
Be sure your answer has 3 significant digits.
Liquid weighing 0.98 gram and containing 90% of carbon and 8% of hydrogen give the following result in the bomb calorimeter experiment amount of water taken in the calorimeter equal to 450 gram water equivalent of the calorimeter equal
to 450 gram rise in temperature of water equal to 1.8 degree centigrade if the latent heat of steam is 587 calorie per gram calculate the cross and net calorific value of the fuel
We have exposed 1 kg of water, 1 kg of brick, and 1 kg of concrete each to a heat source that puts out 100 J every second. Assuming that all of the supplied energy goes to each material and they were all initially at the same temperature, which one of these materials will have a greater temperature rise after 10 s? We can answer this question using Equation as shown . We will first look up the values of the specific heat for water, brick, and concrete, which are cwater = 4180 J⁄kg K, cbrick = 960 J⁄kg K and cconcrete = 880 J⁄kg K . Now applying as shown , Ethermal = mc(Tfinal Tinitial) to each situation, it should be clear that although each material has the same amount of mass and is exposed to the same amount of thermal energy, the concrete will experience a higher temperature rise because it has the lowest heat capacity value among the three given materials.
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- Your answer is partially correct. An insulated Thermos contains 110 cm3 of hot coffee at 83.0°C. You put in a 15.0 g ice cube at its melting point to cool the coffee. By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though it were pure water and neglect energy exchanges with the environment. The specific heat of water is 4186 J/kg-K. The latent heat of fusion is 333 kJ/kg. The density of water is 1.00 g/cm³. Number i 20 Units C°arrow_forwardA diesel engine required 9,800 kJ of heat to produce 1,800 kJ of power. What is its efficiency?arrow_forwardQuestion 2 Lauren has worker bullding her house on a hot summer day. She prepares a drink for them by adding a certain amount of ice at 0.0 °C to 1.8 kg of tea, initially at 80°C. How much ice in kilograms does she need to get the iced tea to be at final temperature of 10C? The heat of fusion of ice is 333 kJ/kg, specific heat of ice is 2100 J/kg. "Cand that of tea is 4186 Jkg. C 1.0 kg 15 kg O 12 kgarrow_forward
- For a building located in Madrid, Spain with annual heating degree-days (dd) of 4654, a heating load (heat loss) of 30,000 kj/h, and a design temperature difference of 30° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 92%, how muchgas is burned to keep the home at 20° C? State your assumptions.arrow_forwardCalculate the amount of energy required in BTU to heat the air in a 10°F house 30 by 50 by 40 ft and increase the temperature by 70F at constant pressure.arrow_forwardWhen a cake is removed from an oven, its temperature is measured at 320°F. Three minutes later its temperature is 210°F. How long will it take for the cake to cool off to a room temperature of 80°F?arrow_forward
- Problem 10 A homeowner is trying to decide between a high-efficiency natural gas furnace with an efficiency of 95 percent and a ground-source heat pump with a COP of 3.3. The unit costs of electricity and natural gas are $0.112/kWh and $1.44/therm (1 therm = 105, 500 kJ). Determine which system will have a lower energy cost.arrow_forwardQ2/ How much heat does 50g of aluminum give off as it cools from 100c° to 10c°? for aluminum c=88 J/Kg.c°.arrow_forwardA certain fluid has an enthalpy 1800 KJ/kg and 500 KJ/kg work flow. Find the internal energy.arrow_forward
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