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A heat pump that operates on the ideal vapor-compression cycle with refrigerant-134a is used to heat a house and maintain it at 75°F by using underground water at 50°F as the heat source. The house is losing heat at a rate of 60,000 Btu/h. The evaporator and condenser pressures are 50 and 120 psia, respectively. Determine the power input to the heat pump and the electric power saved by using a heat pump instead of a resistance heater.
Five $1,000 bonds having a bond rate of 8% per year payable quarterly are pur chased for $4,940 and kept for 6 years, at which time they are sold. Determine the selling price that yields a 6% effective annual return on the investment.
a 2kg piston accelerates to 20m/s from rest. what constant gas pressure is required if the area is 10cm^2, the travel is 10cm and the outside pressure is 100Kpa
write a computer program and use it to calculate the bending moment under each load and at the midpoint c of the beam for values of x from 0 to 24 ft at interval delta x = 1.5ft
1. draw a plan of a typical strip mine showing all operational features and equipment.2. answer the followinga. why is
(a) What are some of the important properties of unalloyed copper that make it an important industrial material (b) How is copper extracted from copper suflide ore concentrates
A single screw extruder is being used to process pregelatinized starch. The screw dimensions are as follows: channel width 3 cm, channel height 0.5 cm and screw length 50 cm. The wall velocity is estimated to be 0.31 m/s.
Calculate the depth of flow upstream of the bridge assuming that the pier coefficient of drag is 1.2. Drag Force CD Af (V1^2)/2 CD=1.2
You have a beaker filled with coarse sand. The capacity of the beaker is 100cm^3. Next, you add to the beaker 40cm^3 of distilled water, filling the water level exactly to the top of the sand.
an engineering student is driving on a level roadway and sees a construction sign 180 m ahead in the middle of the
A water supplier wants to inject ozone into a piper bringing water to the water treatment plant to predisinfect the influent. The 3.0-ft diameter piper is 3,400 feet long with a steady flow rate of 10,000 gal/min.
In a water table aquifer bounded on the ends by rivers, the hydraulic conductivity is 50 m/day. The hydraulic heads at x = 0 and x = 1000 m are 100 m and 90 m, respectively.
Three shafts and four gears are used to form a geartrain which will transmit 7.5 kW from the motor at A to a machine tool at F. (Bear- ings for the shafts are omitted from the sketch.) Knowing that the frequency of the motor is 30 Hz
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