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The code enforcement unit of a public safety department has two options for purchasing a new vehicle: a $23,000 four-cylinder sedan that averages 26 mpg or a $28,000 hybrid that averages 47 mpg. Assuming that gasoline will cost $4.00 per gallon, that the vehicle will be driven for 15,000 miles per year and will incur annual maintenance costs of $200, which vehicle should the unit purchase? Further assume the vehicle will be kept for five years with no salvage value and a discount rate of 5%. Does your recommendation change if the vehicle is kept for six years?
Important information about Multipal choice question on mechanics, A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?
A heat pump uses r134a as the refrigerant to keep a heated space at 20°c by pumping from a geothermal water source. Water from the geothermal source enters the evaporator (a heat exchanger) at 50°c and leaves at 40°c at a rate of 0.08 kg/s. The re..
The yield strength for an alloy that has an average grain diameter of 4.4 x 10-2 mm is 115 MPa. At a grain diameter of 7.1 x 10-3 mm, the yield strength increases to 258 MPa. At what grain diameter, in mm, will the yield strength be 237 MPa?
a refrigerator consumes 280 w of electric power when it is running. the cost of electricity is 10 cents per kwh. what
the acceleration of a particle is defined by the relation a25-3x2 where a is expressed in ms2 and x in meters. the
one of your classmates claims to have invented a flow device to increase the superheat of steam. his claim is that he
a block weighing 10 lbf and having dimensions 10 in. on each edge is pulled up an inclined surface on which there is a
A single phase step up transformer is used to transform 240VRMS to 2400VRMS. The transformer is operating at its rated power of 1kW (with purely resistive load), with transformer Reqp = 5, and a Xeqp = 4j, ignore the magnetising branch.
a 13.2 kg axial load is uniformly carried by an aluminum pipe with an outside diameter of 10.0000 cm and an inside
two wooden members shown which support a 3.6 kip load are joined by plywood splices fully glued on the surfaces in
Using the thermodata computed from the matlab functions to compute the mixture-averaged mass specific Gibbs free energy of the final mixture, as a function of the progress variable (normalized as: 0 for no dissociation, and 1 for complete dissociatio..
a 12x36 and 9 high empty prism composed of a material with an elastic modulus of 345000 psi 9000 psi yield stress the
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