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A new dam project will require $48,000 a year in maintenance costs after it is complete. These maintenance costs will continue forever. Assume that the funding can be set aside in an account that earns 5% interest per year. What is the lump sum to be set aside now in order to cover the $48,000 in annual maintenance costs?
a heat engine is operating on a carnot cycle and has a thermal efficiency of 55. the waste heat from this engine is
The school cafeteria has found that they go through 9 sandwiches for every 6 tickets they sell to the students. Today they have 558 sandwiches available. How many lunch tickets can they sell today?
a 50 cm long 800 w electric resistance heating element with diameter .5 cm and surface temperature 120c is immersed in 60 kg of water temperature to 80c. also determine the convection heat transfer coefficients at the beginning and at the end of t..
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
during drilling of a deep oil well the drill pipe got rigidly stuck. it was necessary to determine the depth at which
a recently negotiated union contract allows workers in a shipping department 24 minutes for rest 10 minutes for
a refrigerator uses refrigerant-134a as the working fluid and operates on the vapor-compression refrigeration cycle.
an irreversible first-order reaction gave 95 conversion in a batch reactor in 20 min.a. what would be the conversion of
what is the equation for the range of an aircraft moving at constant equivalent speed? normally the range is given by
two reversible power cycles are arranged in series. the first cycle receives energy by heat transfer from a reservoir
a pilot tube mounted on a aicraft flying at 2700 m measures a differential pressure of 30mmhg. assuming a standard
an insulated rigid-wall tank contains air at 20 c and 2 bar. a paddle wheel located in the tank does work on the air in
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