Please choose the correct answer for problem 1,2,3,4 1) A brick wall has a thickness of...

Please choose the correct answer for problem 1,2,3,4

1) A brick wall has a thickness of 0.3 m, an area of 30 m² , and a thermal conductivity of 0.7W/(m· ◦C). One side of the wall is at a temperature of 5◦C and the other side of the wall is at 25◦C. What is the energy/sec flowing through the wall due to conduction?

A. 1000 W B. 1200 W C. 1400 W D. 1600 W

2) A brick wall has a thickness of 0.3 m, an area of 30 m² , and a thermal conductivity of 0.7W/(m· ◦C). One side of the wall is at a temperature of 5◦C and the other side of the wall is at 25◦C. Assuming the temperatures 5◦C and 25◦C remain constant, how many joules of energy will flow through the wall due to conduction, in 50 seconds?

A. 60000 J. B. 70000 J C. 80000 J. D. 90000 J

3) A copper rod of length 18 cm = 0.18 m is joined to a steel rod of length 6 cm = 0.06 m. The copper rod and the steel rod have the same cross-sectional area 0.0004 m² . The temperature on the left end of the copper rod is 100◦C and the temperature at the right end of the steel rod is 0◦C. Copper has a thermal conductivity of 387W/(m · ◦ C) and Steel has a thermal conductivity of 43W/(m · ◦ C). The energy/sec flowing through the 2 rod system is in steady state, meaning the heat flow due to conduction is constant in the 2 rod system. What is the energy/sec flowing through the two rod system due to conduction?

A. 21.5 W B. 41.5 W C. 61.5 W D. 81.5 W

4) A monatomic ideal gas (γ = 1.67 and ∆U = 3 2 nR∆T) has an initial pressure of 1.2×106 Pa, an initial volume of 4 × 10^-5 m³ , and an initial pressure of 600 K. The gas undergoes an adiabatic expansion to a final volume of 2.4 × 10^-4 m³ . What is the work done by the gas during the expansion?

A. 50.4 J B. 100.4 J C. 150.4 J D. 200.4 J

Expert Solution

genius_generous answered 2 years ago

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