what is the solution? (a) Find the rate of energy flow through a copper block of
ID: 1670311 • Letter: W
Question
what is the solution? (a) Find the rate of energy flow through a copper block ofcross-sectional area 25 cm2and length 6.0 cm when a temperaturedifference of 40°C is establishedacross the block.1 J/s
(b) Repeat the calculation, assuming that the material is a blockof stagnant air with the given dimensions.
2 J/s
(c) Repeat the calculation assuming, that the material is a blockof wood with the given dimensions.
3 J/s what is the solution? (a) Find the rate of energy flow through a copper block ofcross-sectional area 25 cm2and length 6.0 cm when a temperaturedifference of 40°C is establishedacross the block.
1 J/s
(b) Repeat the calculation, assuming that the material is a blockof stagnant air with the given dimensions.
2 J/s
(c) Repeat the calculation assuming, that the material is a blockof wood with the given dimensions.
3 J/s
Explanation / Answer
(a)The rate of energy flow through a copper block ofcross-sectional area 25 cm2and length 6.0 cm when a temperaturedifference of 40°C is establishedacross the block is(E/t) = k * (l/A * (T2 - T1)) where k = 401 W/mK,l = 6.0 cm = 6.0 * 10-2 m,A = 25cm2 = 25 * (10-2)2 m2 =25 * 10-4 m2 and T2 -T1 = 40 oC = (40 + 273) K = 213 K (b)When the material is a block of stagnant air with thegiven dimensions then the rate of energy flow can be obtained bysubstituting k = 0.024 W/mK in equation (1) (c)When the material is a block of wood with thegiven dimensions then the rate of energy flow can be obtained bysubstituting k = 0.12 W/mK in equation (1)
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