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An elliptical artificial island is required for a reclamation project. The major axis of the ellipse is 10 km and the minor axis is 7.5 km (Figure P4.23). A rock breakwater, 100 m thick, forms the edges of the island. The area within the breakwater is to be filled with sand. The sand in its loosest state has a porosity of 90% and the desired porosity, when compacted, is 20%. Assuming the average thickness of the completed island is 100 m, determine the quantity of sand required.
A refrigerator uses refrigerant-134a as the working fluid and operates on an ideal vapor-compression refrigeration cycle between 0.12 and 0.7 MPa.
She plans to deposite 5% of her yearly salery, into retirment fund that earns 7% intrest compounded daily. what amount will accumulate at time of her retirement?
Assume that an egg can be hatched only in the week after it is laid. Otherwise it must be saved and sold for 10 cents. Assume that there are no eggs available for hatching in the first week.
A sailor is being rescued using a boatswain's chair that issuspended from a pulley that can roll freely on the support cableACB amd is pulled at a constant speed by cablle CD
Determine the total cost function C (T). (Hint: It includes the cost of producing the product and fixed cost.) Find the marginal cost function Cm for producing the product
The temperature of steam at the inlets of both turbines is 500 C, and the enthalpy of steam is 3027 kJ/kg at the exit of high pressure turbine, and 2385 kJ/kg at the exti of the low pressure turbine.
Consider a velocity field V = axiˆ + by(1+ ct) ˆj , where a=b=2 sec-1, and c=0.4sec-1. For the particle that passes through the point (x,y)=(1,1) at the instant t=0, plot the pathline during the interval from t=0 to 1.5 sec.
The engineering team at Manuels Manufacturing, Inc., is planning to purchase an enterprise resource planning (ERP) system. The software and installation from Vendor A costs $380,000 initially and is expected to increase revenue $125,000 per year ever..
Consider some hypothetical X+ - Y - ion pair for which the equilibrium interionic spacing and bonding energy values are 0.38 nm and - 6.38 eV respectively. If it is known that n in the equation has a value of 10, determine the expressions for attract..
Water flows through a 75 mm constriction in a horizontal 150 mm pipe. If the pressure in the 150 mm section is 345 kPa and that in the constriction 207 kPa, calculate the velocity in the constriction and the flowrate.
Find a recurrence relation for the number of ways to go n miles by fast walking at 2 miles per hour or jogging at 4 miles per hour or running at 8 miles per hour; at the end of each hour a choice is made of how to go the next hour.
What is the average velocity of the body for the time interval, t = 0 and the time that it crosses the X-axis?
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