SpecialProblems3-5 - (b How much power is required(kW for...

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Special Problems for ME 200 – Fall 2009 Special Problems 3, 4, & 5 Due Friday, September 4, 2009 SP3: Fresh water and sea water flowing in parallel horizontal pipelines are connected to each other by a double U-tube manometer, as shown in the figure. Assume that the density sea water is 1035 kg/m 3 . (a) Determine the pressure difference (kPa) between the two pipelines. (b) Can the air column be ignored in your analysis? (c) If the air is replaced with oil of specific gravity 0.72, then what is the pressure difference (kPa) between the two pipelines? Can the oil column be neglected? SP4: A damaged 1200-kg car is being towed by a truck. Assume that friction, air drag, and rolling resistance are negligibly small. (a) Determine the power required (kW) for constant velocity on a level road.
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Unformatted text preview: (b) How much power is required (kW) for constant velocity of 50 km/hr on an uphill road at 30 ° with respect to horizontal? (c) Calculate the power required (kW) when accelerating on a level road from rest to 90 km/hr in 12 seconds. SP5: 1 kg of air expands at constant temperature of 27 ° C in a piston-cylinder device when its specific volume changes from 0.05 m 3 /kg to 0.1 m 3 /kg. Assume that the air satisfies the relation, Pv = RT, where R = 0.287 kJ/kg-K. (a) Determine the quasistatic work done (kJ/kg) during the process. (b) What is the total work done (kJ/kg) assuming a frictional force of 5000 N acts through 0.25 m during the piston motion? (c) Is the work done to overcome the frictional force quasistatic? Explain....
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