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A cook filled a pressure cooker with 3 kg water at 20?C and a small amount of air and forgot about it. The pressure cooker has a vent valve, so if P > 200 kPa, steam escapes to maintain a pressure of 200 kPa. How much entropy was generated in the throttling of the steam through the vent to 100 kPa when half of the original mass escaped?
The maximum wind pressure on the traffic sign is 200 kg/m2. The maximum allowable shear stress is 350 kg/cm2. Design the traffic pole (only vertical element) against torsion knowing that angle of twist at the base should not exceed 6°.
A satellite is launched 600 km from the surface of the earth, with an initial velocity of 8333.3 m./s, acting parallel to the tangent of the surface of the earth. Assuming the radius of the earth to be 6378 km and that is 5.976 * 10^6 kg, determine t..
A civil engineer used a 30-m tape in measuring an inclined distance. The measured length on the slope was recorded to be 459.20 m long. The difference in elevation between the initial and the end point was found to be 1.25 m.
Using the method of superposition, determine the deflection at C of beam AB . The beams are made of wood having a modulus of elasticity of E = 1.5(103 ) ksi.
Some skin divers go as deep as 50m. What is the gage pressure at this depth in fresh water, and what is the ratio of the absolute pressure at this depth to normal atmospheric pressure? assume T=20 degrees celcius
The specification for a particular application calls for the blocks to have a mean compressive strength greater than 1350 kPa. A sample of 100 blocks is produced and tested.
A water treatment plant with a maximum daily flow of 4.4 m3/s is treating surface water with a minimum ambient temperature of -1°C (30°F). The water is coagulated with alum and the alum floc was measured to have a settling velocity of 1.6 m/h at 1..
(a) Define the hardenability of a steel. (b) Define the hardness of a steel. (c) Describe the Jominy hardenability test. (d) Explain how the data for the plotting of the Jominy curve are obtained and how the curve is constructed.
The distance l, which is the distance between the outside face of the exterior support at the left-hand end of the beam and the center of the interior support at the right-hand end, is 30ft; the width of the exterior support at the left is 16in.
A river discharges at a rate of 500 cfs into a lake. The water is drawn from the lake at a rate of 200 cfs. The surface area of the lake is 60 acres (1 acre = 43, 560 ft2). What is the rate of water rise in the lake in one day
A 40 oF breeze of 10 miles per hour blows over the top of a round open-top water cooling tank which has a bulk temperature of 100 oF. What is the rate of energy in kW that enters into the air
calculate the gravitational force between the earth and the moon in newtons. the distance between the earth and the moon is 384x10^3
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