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A piston-cylinder device contains helium gas initially at 150 kPa, 20 degrees C, and 0.5 m^3. The helium is now compressed in a polytropic process (PV^n = constant) to 400 kPa and 140 degrees C.
Now 300 kJ of heat is transferred to the refrigerant at constant pressure while 110-V source supplies current to a resistor within the cylinder for 6 min. Determine the current supplied if the final
A mass of 5 kg of saturated liquid-vapor mixture of water is contained in a piston-cylinder device at 125 kPa. Initially, 2 kg of the water is in the liquid phase and the rest is in the vapor phase.
10-kg of nitrogen is heated from 20 degrees C to 250 degress C. Determine the total amount of heat required when this is done in (a) a constant-volume process and (b) an isobaric process.
A tugboat tows a ship at a constant velocity. The tow harness consists of a single tow cable attached to the tugboat at point A that splits at point B and attaches to the ship at points C and D.
The bend lies in a horizontal plane, and water enters from the west and leaves toward the north. Assuming no drop in pressure, what is the magnitude and direction of the resultant force acting on th
The 2kg block A and the 5kg block B are initially at rest on the inclined plane at 20 degrees. All surfaces in this system have a coefficient of static friction of 0.6 , and a coefficient of kinetic
Using an 9.34 in long wrench, the bolt has now been unscrewed a length of 1.10 in. The force of F={-52.7i +7.00j +6.00k} lb is still applied to the wrench at point B.
A rectangular tube has an outside dimensions that are 2in wide and 4in deep and a wall thickness of 0.25in. The tube is acted on by a bending moment of 12,000lb-in.
Explain the difference between materials considered to have "homogeneous" and "isotropic" material properties. Give examples of materials that are considered isotropic
Determine the size (liters/hour) of a proportioning pump to feed ferric chloride for a 0.438 m^3/s water treatment plant. The optimum dose selected is 50 mg/L.
the contractor ran out of gunite mixture and finished the deep corner of a 5-m-wide swimming pool, with a quarter circle pipe of PVC pipe. compute the horizontal and vertical forces on the curved pa
The rod is fixed against rotation at its left end, but free to rotate in a bearing at its right end. Each disk is 300mm in diameter. Calculate the maximum shear stress in each segment of the rod.
A river is 2 m deep. The river bed consists of a depth of sand of saturated unit weight 20 kN/m^3. What is the effective vertical stress 5 m below the top of the sand
A movable cone fits inside a stationary conical depression. If a torque is applied to the cone, the cone will rotate at a certain speed depending on the angles θ and β, the radius r o, an
Discuss how the NEC3 form of contract provides stimulus to good management and compare and contrast this where possible with other forms of contract.
If the water temperature is 70 degrees C (vapor pressure of water at 70 degrees C is 31.2 kPa absolute), and the pressure in the pipeline is 275 kPa, what is the maximum flowrate which will occur wi
Water flows through a 75 mm constriction in a horizontal 150 mm pipe. If the pressure in the 150 mm section is 345 kPa and that in the constriction 207 kPa, calculate the velocity in the constrictio
If each cable segment can support maximum tension of 75 lb, determine the largest load P that can be applied.
A simply supported span of 28 feet must carry a uniform loading that produces a total factored maximum moment of 300 K-ft including the beam weight. The concrete can be 3.5 ksi and the steel is grad
The sports car has a mass of 2.3 Mg and accelerates. at 6m=s2, starting from rest. If the drag resistance on the car. due to the wind is F D = (10v) N, where v is the velocity in m/s,
If the 20-kg crate is originally resting on the floor such that the cable tension is zero at the instant the motor is turned on, determine the speed of the crate when t=6s.
within a field that is used for agricultural production, a clay unit is found at a depth 8ft below the land surface. the surface soil has a hydraulic conductivity of .6 ft/d. if parallel drains are
A sheet pile wall is driven to a depth of 12.00 m in the deposit. The difference in water level between the two sides of the piling is 4.00 m. Draw the flow net and determine the quantity of seepage
In a falling-head permeability test the initial head of 1.00 m dropped to 0.35 m in 3 h, the diameter of the standpipe being 5 mm. The soil specimen was 200 mm long by 100 mm in diameter.