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hw02-hints

# hw02-hints - the water Determine ∆ U ∆ KE ∆ PE Q and...

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ABE 484/584 CHOI HW2 1. [ Cookware ] One brand of cookware has stainless steel pots with copper bases. Discuss the advantages and disadvantages of this design. Do not limit your design consideration merely to heat transfer aspects. 2. [Work] Measured data for pressure versus volume during the expansion of gases within the cylinder of an internal combustion engine are given in the table below. Using data from the table, complete the following: (a) Determine a value of n such that the data are fit by an equation of the form, pV n = constant. (b) Evaluate analytically the work done by the gases, in kJ, using the result of part (a) Department of Agricultural and Biosystems Engineering, The University of Arizona

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ABE 484/584 CHOI 3. [Conservation of Energy] Consider a system composed of a stone having a mass of 10 kg and a bucket containing 100 kg of water. Initially the stone is 10.2 m above the water and the stone and water are at the same temperature. The stone then falls into
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Unformatted text preview: the water. Determine ∆ U, ∆ KE, ∆ PE, Q, and W for the following changes of state: (a) The stone is about to enter the water. (b) The stone has just come to rest in the bucket. (c) Heat has been transferred to the surroundings in such an amount that the stone and water are at the same temperature they were initially. Department of Agricultural and Biosystems Engineering, The University of Arizona ABE 484/584 CHOI 4. [ Insulator ] Calculate the reduction in heat transfer through a wall made up of jumbo bricks of width = 0.15 m (k=1 W/ m ⋅ o C) created by adding 5 cm of fiber insulating board (k=0.05 W/ m ⋅ o C) to the inside surface of the bricks. The outside wall temperature is – 10 o C, and the inside wall temperature is 20 o C. Calculate R-values and evaluate if we can use these materials in Tucson. Department of Agricultural and Biosystems Engineering, The University of Arizona...
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