Bebang owns a 830-mm-thick concrete brick table top that has anarea of 10,000,000 mm^2 and a 0.750-cm-thick glass plate that hasan area of 20,000 cm^2. Assuming the same temperature differenceacross each, what is the ratio of the rate of heat conduction throughthe plate with respect to the rate of heat conduction through thetable top? Use Table 10.1(given below) for the value of ThermalConductivity k.Table 10.1 Thermat Conductivities of Common SubstancesValues are given for temperatures near o °C.SubstanceThermal Conductivity k (W/m-ODiamond2000Silver420Copper390Gold318Aluminum220Steel ironSteel (stainless)14Ice2.2Glass (average)0.84Concrete brickO.84water0.6Fatty tissue (without blood)0.2Asbestos0.16Plasterboard0.16wood0.08-0.16Snow (dry)0.10Cork0.042Glass wool0.042wool0.04Down feathers0.025Air0.023Polystyrene foam0.010

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Bebang owns a 830-mm-thick concrete brick table top that has an area of 10,000,000 mm^2 and a 0.750-cm-thick glass plate that has an area of 20,000 cm^2. Assuming the same temperature difference across each, what is the ratio of the rate of heat conduction through the plate with respect to the rate of heat conduction through the table top? Use Table 10.1(given below) for the value of Thermal Conductivity k. Table 10.1 Thermal Contuctivities of Common Substances Values are gven for tempperatures nearoc. Thermal Conduetivity k (W/m Substance Diamond 2000 saver 420 Copper Gold Aminum 220

Bebang owns a 830-mm-thick concrete brick table top that has an area of 10,000,000 mm^2 and a 0.750-cm-thick glass plate that has an area of 20,000 cm^2. Assuming the same temperature difference across each, what is the ratio of the rate of heat conduction through the plate with respect to the rate of heat conduction through the table top? Use Table 10.1(given below) for the value of Thermal Conductivity k. Table 10.1 Thermal Contuctivities of Common Substances Values are gven for tempperatures nearoc. Thermal Conduetivity k (W/m Substance Diamond 2000 saver 420 Copper Gold Aminum 220

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Concept explainers

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.

Question

Bebang owns a 830-mm-thick concrete brick table top that has an
area of 10,000,000 mm^2 and a 0.750-cm-thick glass plate that has
an area of 20,000 cm^2. Assuming the same temperature difference
across each, what is the ratio of the rate of heat conduction through
the plate with respect to the rate of heat conduction through the
table top? Use Table 10.1(given below) for the value of Thermal
Conductivity k.
Table 10.1 Thermat Conductivities of Common Substances
Values are given for temperatures near o °C.
Substance
Thermal Conductivity k (W/m-O
Diamond
2000
Silver
420
Copper
390
Gold
318
Aluminum
220
Steel iron
Steel (stainless)
14
Ice
2.2
Glass (average)
0.84
Concrete brick
O.84
water
0.6
Fatty tissue (without blood)
0.2
Asbestos
0.16
Plasterboard
0.16
wood
0.08-0.16
Snow (dry)
0.10
Cork
0.042
Glass wool
0.042
wool
0.04
Down feathers
0.025
Air
0.023
Polystyrene foam
0.010

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