(a) Calculate the rate at which body heat is conducted through the clothing of a skier in a steady-state process, given the followingdata: the body surface area is 1.6 m2, and the clothing is 1.9 cm thick; the skin surface temperature is 33°C and the outer surface of theclothing is at 0.69°C; the thermal conductivity of the clothing is 0.060 W/m-K. (b) If, after a fall, the skier's clothes became soaked withwater of thermal conductivity 0.60 W/m-K, by how much is the rate of conduction multiplied?(a) NumberUnits(b) NumberUnits

Answered: Image /qna-images/answer/876afc64-155d-4162-ab42-aae4e2fb754f.jpg

Answered: (a) Calculate the rate at which body…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Q:33)
Even when shut down after a period of normal use, a large commercial nuclear reactor produces heat at the rate of 130 MW by the radioactive decay of fission products. This causes a rapid increase in temperature if the cooling system fails. (a) Calculate the rate of temperature increase in degrees Celsius per second (°C/s), if the mass of the reactor core is 1.60 x 105 kg and has an average specific heat of 0.0800 kcal/kg.°C. °C/s (b) How long would it take to obtain a temperature increase of 2000°C? (The initial rate of temperature increase would be greater than calculated here, because the heat is concentrated in a smaller mass, but later, the temperature increase would slow because the 5 x 105 kg steel containment vessel would begin to be heated, too.) Additional Materials O Reading
(g) A thin, 1.44-kg slab of copper at 18.0°C is set sliding at 2.90 m/s over an identical stationary slab at the same temperature. Friction quickly stops the motion. Assuming no energy is transferred to the environment by heat, find the change in temperature of both objects. (Assume the specific heat of copper is 387 J/kg · °C.) ΔΤ. sliding slab The correct answer is not zero.°C ΔΤ. stationary slab The correct answer is not zero.°C (h) Evaluate Q and AE, int for the sliding slab and AE, 'mech for the two-slab system. ΔΕ , int ΔΕ. mech (i) Evaluate Q and AE, int for the stationary slab. ΔΕ. int
Consider a thin round plate at 350K with a radius of 18 cm is placed on a very large and very thick table of conductivity k = 1.6 W/mK. The plate has an emissivity of 0.6 and the temperature of the surrounding air and the table and the large room walls is 298 K. At this time, (a) How much heat (in W) is leaving via radiation? (b) How much heat (in W) is leaving via convection? (c) How much heat (in W) is leaving via conduction?
A glass windowpane in a home is 0.62 cm thick and has dimensions of 1.1 m × 1.7 m. On a certain day, the indoor temperature is 26°C and the outdoor temperature is 0°C. (a) What is the rate at which energy is transferred by heat through the glass? Answer in W (b) How much energy is lost through the window in one day, assuming the temperatures inside and outside remain constant? Answer in J
(a) What is the rate of energy loss in watts per square meter through a glass window 3.5 mm thick if the outside temperature is -17°F and the inside temperature is +73°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 5.5 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m-K.) (a) Number (b) Number Units Units
In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is Tin = 20°C and the temperature outside is Tout = 0°C. The walls and uppermost ceiling of a typical house are supported by 2 x 6-inch wooden beams (kwood = 0.12 W/(mK)) with fiberglass insulation (kins = 0.04 W/(mK)) in between. The true depth of the beams is actually 5.625 %3D %3D %3D inches, but we will take the thickness of the walls and ceiling to be Lwall = 18 cm to allow for the interior and exterior covering. Assume that the house is a cube of length L = 9.0 m on a side. Assume that the roof has very high conductivity, so that the air in the attic is at the same temperature as the outside air. Ignore heat loss through the ground. The effective thermal conductivity of the wall (or ceiling) keff , is the area-weighted average of the thermal conductivities of the wooden beams and the fiberglass insulation that make up each of them. Allowing for the fact that the 2 x 6 beams…
Unreasonable Results - A meteorite 1.20 cm in diameter is so hot immediately after penetrating the atmosphere that it radiates 20.0 kW of power. (a) What is its temperature, if the surroundings are at 20.0C and it has an emissivity of 0.800? (b) What is unreasonable about this result? (c) Which premise or assumption is responsible?
(a) What is the rate of energy loss in watts per square meter through a glass window 2.4 mm thick if the outside temperature is -5.1°F and the inside temperature is +70°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 5.9 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m.K.) (a) Number i (b) Number Units Units
(a) If the heat capacity of an electric jug is 500 J °c1, how much heat energy does it absorb when heating 1.5 L of water, specific heat 4200 J kg1 0c1, from 20°C to 95°C?
1) The walls of a house are 11 cm thick and have an average thermal conductivity two times that of cork. The walls' surface area is 850000 cm2 and their inside surface is at 18°C, while their outside surface is at 4°C. (Thermal conductivity of cork is 0.036 W/m°C). Calculate, (i) The rate of heat conduction through house walls in Watts: (1) Amount of heat conducted in Joules, in 5 min: 2) A spherical infrared heater of radius 6.5 cm and an emissivity of 0.82 radiates 0.48 kW of power. Given, Stefan's constant = 5.67x10 Wm K Calculate, Temperature of the heater in Celsius: 1) A 275-turns square loop of 34 cm on a side, carrying a current of 22 A creates a torque of 385 N m when the plane of the coil makes an angle 38° with the magnetic field.
(a) What is the rate of energy loss in watts per square meter through a glass window 2.4 mm thick if the outside temperature is -7.8°F and the inside temperature is +81°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.0 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m-K.) (a) Number i (b) Number i Units Units

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