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A waste heat source is available at 400°C. A heat engine operates using heat from this source. It rejects heat to the surroundings at 38°C. The power from the engine runs an air conditioner to keep the air inside a building at 25°C, rejecting heat to the surroundings at 38°C. Heat leaks into the building at the rate of 1 kW per degree temperature difference between the surroundings and the temperature inside the building. What is the minimum required heat transfer rate from the waste heat source? Five stars to explain relationships of the formulas as you go.
The rain¬fall amounts at three adjacent stations A, B, and C were 4.2, 3.7, and 4.9 in., respectively. The average annual precipitation amounts for the gauges are X = 36.5, A = 42.1, B = 37.1, and C = 39.8 inches.
Briefly describe electron and hole motions in a p-n junction for forward and reverse biases; then explain how these lead to rectification.
At what depth would the vertical effective stress in a deep deposit of clay be 100 kpa, if e=1.1 The ground water level is a 1 m delow ground surface and S=95% above the groundwater level. Neglect pore air pressure.
After falling from rest from a height of 32 m, a 0.45 kg ball rebounds upward, reaching a height of 22 m. If the contact between ball and ground lasted 1.5 ms, what average force was exerted on the ball?
A soil has a total density of 1.80 Mg/m3. When fully dry, the soil has a density of 1.59 Mg/m3. The specific gravity of the solids is 2.57. Find the following soil parameters: a) Dry unit weight of the sample
how to calculate the principle of shoring system in formwork analysis when the secondly floor upper has been poured ?
Determine the time required for a car to travel 1 km along a road if the car starts from rest, reaches a max speed at some intermediate point, and then stops at the end of the road. the car can accelerate at 1.5 m/s^2 and decelerates at 2 m/s^2
determine the dimensions of an ideal circular settling tank that can remove 0.01-in diameter particles with a specific gravity of 1.01. Use a detention time of 1.5 hours, flowrate= 4ft^3/sec, the specific weight of water=62.4 lb/ft^3
If 0.100 mol each of SO2 and NO2 are placed in a 500 mL vessel at this temperature, what are the concentrations of the reactants and products when equilibrium is established for this reaction?
Find the absolute value of the magnitude of force vector B if the resultant force= 1000 lb, force vector A= 1000 lb, and the resultant forms a 45 degree angle with B, and vector B runs parallel to the y axis.
You have been hired to do a survey to search for old tunnels that are rumored to be in the area, previously used to smuggle people across the US-Mexico border. The tunnels are not expected to be exceptionally deep underground.
Determine: a) the height of the water, with respect to the base of each standpipe, and b) the effective stress at the depth of each standpipe, at the following times:
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