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MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
2nd Edition
ISBN: 9781337551755
Author: DUNLAP
Publisher: Cengage Learning US
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Chapter 1, Problem 11P
To determine
Find the inside temperature of the house.
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Q2/ How much heat does 50g of aluminum give off as it cools from 100c° to 10c°?
for aluminum c=88 J/Kg.c°.
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.4 m x 1.9 m. On a certain day, the indoor temperatu
24°C and the outdoor temperature is 0°C.
(a) What is the rate at which energy is transferred by heat through the glass?
W
(b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain
constant?
calculate the heat loss through the ceiling, if the R-19 insulation batt is replaced by R-40 fiberglass insulation.
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MindTap Engineering for Dunlap's Sustainable Energy, SI Edition, 2nd Edition [Instant Access], 1 term (6 months)
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- The inside temperature of an oven is maintained at 230° C while the kitchen air temperature is 25° C . What is the oven/kitchen air temperature difference in degrees Celsius and kelvins?arrow_forwardA glass of a hot water has an initial temperature 80°C, placed in a room where the temperature is 30°C. After one minute the water temperature drops to 70°C. What will be the temperature after 3 minutes? At what time the water cools down to 40°C?arrow_forwardAt midnight, with the temperature inside your house at 70°F and the temperature outside at 20°F, your furnace breaks down. Two hours later, the temperature in your house has fallen to 50°F. Assume that the outside temperature remains constant at 20° F. At what time will the inside temperature of your house reach 40°F?arrow_forward
- 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.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_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_forward
- Suppose you were to build a bridge in the state of Texas. Look over some of the specific heat values for typical building materials. What material do you think you should use when building a bridge here? Why?arrow_forwardA vendor takes an ice cream cup out of a freezer, kept at -18 degree-Celcius. Outside, the room temperature is 32 degree-Celcius. After 60seconds, the ice cream has warmed to -8 degrees Celcius. What is the temperature of the ice cream after 300 seconds?arrow_forwardYour 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_forward
- 4. An incandescent lamp has a tungsten filament whose resistance is 96 ohm at its operating temperature of 2900°C. Calculate the filament resistance when the lamp is disconnected from the electric source under which conditions the temperature is 24°C.arrow_forwardA typical ceiling of a house consists of items shown in the accompanying table. Assume an inside room temperature of 70F and an attic air temperature of 15F, with an exposed area of 1000 ft2. Calculate the heat loss through the ceiling.arrow_forward3. According to Newton's Law of cooling', the rate at which the heat is lost by a heated body is proportional to the difference in temperature between the body and the surrounding medium (when the temperatutre difference is very small). If a thermometer is taken outdoor, where the temperature is 6°C, from a room which temperature is 25C, and the reading drops 15°C in one minute, how long after its removal from the room will the reading be 8°C? after 45 secs what is the thermometer reading?arrow_forward
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