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SpecialProblems1-4ME200SP2012

# SpecialProblems1-4ME200SP2012 - other by a double U-tube...

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Special Problems for ME 200 – Spring 2012 Special Problems SP1, SP2, SP3, and SP4 Due Friday, January 20, 2012 SP1: A 10 m 3 rigid tank has two sections separated by a membrane. Each section contains nitrogen gas. The nitrogen gas in section A has initial density of 1.6 kg/m 3 and the nitrogen gas in section B has a mass of 6 kg. At a certain time, the membrane is punctured. The final density of the nitrogen gas in the tank is found to be 1.8 kg/m 3 . Determine the initial density (kg/m 3 ) of nitrogen gas that existed in section B. SP2: A diver is snorkeling 10 feet under water in coral reefs off the east coast of Florida. At this location, the water density is 62 lbm/ft 3 , the atmospheric pressure is 14.7 psia, and local acceleration due to gravity is 32 ft/s 2 . The pressure on the ear-drums of the diver is: (a) 616.65 lbf/ft 2 (absolute) (b) 616.65 lbf/ft 2 (gauge) (c) 4.28 psia (d) 4.28 psig (e) 18.98 psia (f) 18.98 psig Note: You must show all work to get credit. SP3: Fresh water and sea water flowing in parallel horizontal pipelines are connected to each

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Unformatted text preview: other by a double U-tube manometer, as shown in the figure. Assume that the density sea water is 1035 kg/m 3 . 60 cm 50 cm 70 cm 40 cm Fresh Water Sea Water Mercury Air (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. (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....
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SpecialProblems1-4ME200SP2012 - other by a double U-tube...

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