# thermohw1 - UNIVERSITY OF LOUISIANA-LAFAYETTE Assignment No...

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UNIVERSITY OF LOUISIANA-LAFAYETTE Assignment No. 1 ENGR 301 August 31, 2009 Submitted to: Dr Bajpai u

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1.4C The first law of thermodynamics states that energy can be transformed (changed from one form to another), but cannot be created or destroyed. With this in mind, a still car on neutral going uphill when its brakes are released is going against the first law of thermodynamics. So this could not be possible. One way to prove if a road is uphill or downhill would be to pour water and see which way it flows. 1.5 C The respective units in the English system are the pound-mass (lbm), foot (ft), and second (s). In the English system, the force unit is the pound-force (lbf) and is defined as the force required to accelerate a mass of 32.174 lbm (1 slug) at a rate of 1 ft/s². 1.6 C In physics, the speed of light refers to the speed at which light travels. The light year unit is distance traveled over time. 1.8 E W = mg m = W/g . / 180 lbf32 10ft s² . / 32 174 lbm ∙ft s²1 lbf = 180.4 lbm (180.4 lbm)(5.47 ft/s²) . / 1 lbf32 174 lbm ∙ft s² = 30.7 lbf
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thermohw1 - UNIVERSITY OF LOUISIANA-LAFAYETTE Assignment No...

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