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A chemical plant uses a tube-within-a-tube counterflow heat exchanger to heat air with the use of steam. During steady state operation, the air flows into the exchanger at a rate of 5,000 kg/h and a temperature of 27C and exits at a temperature 20C higher. The air behaves like an ideal gas and its thermodynamic properties are listed in one of the tables in the textbook. Steam enters the heat exchanger as saturated vapor at a pressure of 10^5 N/m2 and exits with a specific enthalpy of 2,223.86 kJ/kg at the same pressure. There is negligible heat transfer between the heat exchanger and its surroundings and no kinetic and potential energy effects. Calculate (a) The mass flow rate of the steam in kg/h; and (b) The quality of the steam exiting the heat exchanger.
The section of the plywood in the 3rd quadrant is sawed off and the resulting piece is then glued squarely over the 4th quadrant portion of the plywood with glue of negligible weight.What are the x- and y-coordinates of the resulting center of gra..
if a clay slope at a construction site fails derive an equation for the undrained shear strength of the clay given that the shear reistance along L of the slope can be given as: (SuH0)/ sin beta
Compute the maximum acceptable service load on an A36 steel plate tension member 1/4in.x12in. having a single line of holes parallel to the direction of loading. The load is 25% dead load and 75% live load, and 7/8in. diameter bolts are used.
A small building that shelters a water supply pump measures 2 m x 3 m x 2.4 m high. It is constructed of 1- cm thick wood having a thermal conductivity of 0.126 W*m^-1*K^-1.
The river channel itself is 20m wide and flow depth is 5m and the sandy bottom has an n=0.02, the left bank is 40m wide and the flow depth is 0.5m, while the right bank is 100m wide with a flow depth of 1m.
The yield stress for A-36 is 250 MPa. Using factor of safety against yield of 1.25, determine an appropriately sized beam such that the radius of curvature is not less than 140m. E= 200 GPa, G= 77.2 GPa.
how far back from the front axle would the center of gravity have to be to ensure that the maximum tractive effort developed for front- and rear- wheel-drive options is equal (assume that all other variables are unchanged)
An agronomist wants to measure the rainfall at the centroid of a plowed field between two roads. What are the coordinates of the point where the rain gauge should be placed?
A stratified lake could be idealized as two layers: with 7.0 m of fresh water on top and 10.0 m of cold water (specific gravity = 1.02) on the bottom. What are the pressure heads at the interface and at the bottom of the lake, in terms of water col..
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:
A 1.50 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of base. The Ka for HF is 3.5 x 10 -4 .
Does Bernard have an unfair advantage over firms having designed the project on which he wants to bid?
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