0.2 kg of air is heated in a constant volume process from 20 to 100(degrees celsius). The specific heat at constant volume is 0.7186J/ Kg K. Calculate the change in entropy of this process.

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A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

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