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It costs $30,000 to retrofit the gasolinepumps at a certain filling station so the pumps can dispense E85 fuel (85% ethanol and 15% gasoline). If the station makes a profit of $0.08 per gallon from selling E85 and sells an average of 20,000 gallons of E85 per month, how many months will it take for the owner to recoup her $30,000 investment in the retrofitted pumps?
The interest rate is 1% per month
a nucleus has 4 excited states at 0.123 mev 0.216 mev 0.401 and 0.555 mev above the ground state. if all transitions
a closed piston-cylinder with air expands and does 2000 ft-lbs of work. heat is added in the amount of 4 btu. what is
a compressor is used to compress air from 1 bar and 290 k to 10 bar. the compression can be assumed to be adiabatic and
a steel plant heat treats steel rods by passing them through a 1000 degrees c oven. the steel rods are 3 meters in
Determine Fourier Number, Compare two identical steel spheres, except the first has a two inch diameter while the second sphere has a four inch diameter. The larger sphere will have a Fourier number approximately
a fixed quantity of air at t1 100oc and p1 243 kpa is heated at constant pressure in a piston-cylinder assembly to t2
Determine the crack growth for cycle #3 using Wheeler's retardation model (m=2)-finite width correction factor for SIF
a brinell hardness measurement is made on a nickel alloy using a 0.01 m diameter sphere of tungsten carbide. a load of
a square-threaded power screw with single thread is used to raise a load of 25000lb. the screw has a mean diameter of 1
1 a 3-inch nominal size cast iron pipe has an actual inside diameter of 3.58 inches. the pipe is 5000 feet long and
Consider a wooden door with a glass window. The door is 5 cm thick and 0.75 m wide by 2 m tall. The window is 0.2 m square and 1 cm thick. The air on one side of the door has a temperature of 23°C and a heat transfer coefficient of 10 W/m2-K. The air..
Air enters a compressor at 105 kPa and 300 K with a volumetric flow rate of 12 m3 /min and exits at 1200 kPa and 400 K. Heat transfer occurs at a rate of 2 kW from the compressor to its surroundings. Assuming ideal-gas behavior for air, steady flow, ..
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