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A firm is considering the following alternatives, as well as a fifth choice: do nothing. Each alternative has a 5-year useful life.
1
2
3
4
Initial cost $100,000
$130,000
$200,000
$330.000
Uniform annual net income ($000s) 26.38
38.78
47.48
91.55
Rate of return 10%
15%
6%
12%
(a) Construct a choice table for interest rates from 0% to 100%.
(b) The firm's minimum attractive rate of return is 8%. Which alternative should be selected?
a 2-kw iron is left on the ironing board with its base exposed to the air at 25 degc. if the surface temperature is 500
A hot water heating system is used to distribute hot water at 70°C through heating pipes with an outside diameter of 60 mm. Estimate the convective heat transfer coefficient (based on unit area, and then on unit length) between the pipe surface and t..
Methane gas in a piston-cylinder assembly goes under an adiabatic (no heat transfer) quasi- equilibrium compression. (This process is called isentropic process). The pressure and volume of the gas during the process are related as PV 1.3=constant.
What are the design implications for the location and positioning of solar cells? Explain why the use of solar cells might be more appropriate in some regions of the country.
a thermodynamic system undergoes a cycle composed of a series of three processes for q1 10 kj q2 30 kj q3 -5 kj. for
For a flow rate of 1.5 L/s, what hose diameter is needed? Use H = 5m and h = 0.5m. Assume all head loss occurs in the tube. Use the rigorous approach to calculate D.
A small fan moves air at a mass flow rate of 0.004 lbm/s. Upstream of the fan the pipe diameter is 2.5 in., the flow is laminar, the velocity distribution is parabolic, and the kinetic energy coefficient 1, is equal to 2.0. Downstream of the fan, the..
Derive a formula for the lateral pressure p between the rubber and the steel. (Disregard friction between the rubber and the steel, and assume that the steel cylinder is rigid when compared to the rubber.)
steam enters a steady flow turbine at 30mpa 1000degc with a flow rate of 10kgs. thirty percent of the inlet mass of
refrigerant 134a enters an adiabtic compressor as a saturated vapour at -20degree c and exits at 1mpa pressure. if the
two kg of superheated steam contained in piston cylinder at 400 c and 600 kpa are cooled at a constant pressure by
A thin walled tube with closed ends has an inside radius of 80mm and a wall thickness of 6 mm. It is subjected to an internal pressure of 20 MPa, a torque of 60 kN*m, and an axial compressive force of 200 kN. Determine the maximum normal stress and t..
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