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The rate of heat flow through a slab does not depend on which of the following? (a) The temperature difference between opposite faces of the slab. (b) The thermal
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Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)
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- Please answer all my questions A house walls that are 21 cm thick and have an average thermal conductivity twice that of glass wool. Assume there are no windows or doors. The walls’ surface area is 1350000 cm2 and their inside surface is at 21°C, while their outside surface is at 6°C. (Thermal conductivity of glass wool is 0.042 W/m°C) (i) Calculate the rate of heat conduction through house walls? Answer for part 1 (ii) How many 100W room heaters would be needed to balance the heat transfer due to conduction? (approximate number) Answer for part 2 b) A spherical infrared heater of radius 5.5 cm has an emissivity of 0.73. What temperature must it run at if the required power is 0.54 kW? Neglect the temperature of the environment. (Stefan's constant = 5.67*10-8 Wm-2K-4) The temperature of the heater in Celsius =arrow_forwardA person is standing outdoors in the shade where the temperature is 21 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 130 cm2 and its emissivity is 0.90. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.54?arrow_forwardThe 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 5.2-g peanut if the energy from burning it is transferred to 0.485 kg of water held in a 0.085-kg aluminum cup, causing a 54.9°C temperature increase? Specific heat of water= 1kcal/Kg degrees C Specific heat aluminum= 0.215kcal/Kg degrees Carrow_forward
- Students on a spring break picnic bring a cooler that contains 5.3 kg of ice at 0.0 °C. The cooler has walls that are 3.5 cm thick and are made of Styrofoam, which has a thermal conductivity of 0.030W/(m-C). The surface area of the cooler is 2.2 m² and it rests in the shade where the air temperature is 22 "C. Find the rate at which heat flows into the cooler. Express your answer using two significant figures. 195] ΑΣΦ Q/t= Submit Previous Answers Request Answer X Incorrect; Try Again; 3 attempts remaining Part B How long does it take for the ice in the cooler to melt? Express your answer using two significant figures. 15. ΑΣΦ W hrs.arrow_forwardA glass windowpane in a home is 0.62 cm thick and has dimensions of 1.0m x 2.0 in. On a certain day the indoor tempreature is 25˚ C and the outdoor tempreature is 0˚C (a) What is the rate at which energy is transferred by heat through the glass ? (b) How much energy is lost through the window in one day, assuming the tempreatures inside and outside remain constant.arrow_forwardAn unused wood-burning stove has a constant temperature of 18 °C (291 K), which is also the temperature of the room in which the stove stands. The stove has an emissivity of 0.900 and a surface area of 3.50 m2. What is the net radiant power generated by the stove?arrow_forward
- College PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax CollegePhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
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