Write a Windows program that creates a child process that prints a greeting, sleeps for 20 seconds, then exits. The parent process should print a greeting before creating the child, and then...
What is the minimum distribution coefficient that permits removal of 99% of a solute from 50.0 mL of water with (a) Two 25.0-mL extractions with toluene? (b) Five 10.0-mL extractions with toluene?
Turbines at the Conowingo plant on the Susquehanna River each develop 54,000 bhp at 82 rpm under a head of 89 ft. What type of turbines are these? Estimate the flow rate and impeller diameter.
Liquid octane (C8H18) enters a steady-flow combustion chamber at 25C and 1 atm at a rate of 0.25 kg/min. It is burned with 50 percent excess air that also enters at 25C and 1 atm. After combustion,...
Determine the couple moment. Express the result as a Cartesian vector. Given: F = 80 N a = 6 m b = 10 m c = 10 m d = 5 m e = 4 m f = 4 m F.
A stripper operating at 50 psia with three equilibrium stages is used to strip 1,000 kmol/h of liquid at 250F having the following molar composition: 0.03% C1, 0.22% C2, 1.82% C3, 4.47% nC4, 8.59%...
Figure shows a pulse function. (a) From details in the drawing, calculate the pulse width, t. (b) Construct this function as the sum of simpler time elements, some perhaps translated in time, whose...
Repeat Prob. 384 with Fx = 300 lbf, Fy = 250 lbf, and Fz = 100 lbf, and for a brittle material, requiring the inclusion of stress concentration in the fillet radius. Repeat Prob. 384, The...
Compute the power that is absorbed or supplied by the elements in the network shown. +12 44A 14. 2A 2 4 2 24 V 3 28 V
Using superposition, determine the maximum deflection of the beam shown in the figure. The material is carbon steel. 851bf I3b 85 2-ia-die steft
Consider a steam power plant that operates on the regenerative Rankine cycle with one open feedwater heater. The enthalpy of the steam is 3374 kJ/kg at the turbine inlet, 2797 kJ/kg at the location...
An aluminum heat sink (k = 240 W/m K) used to cool an array of electronic chips consists of a square channel of inner width w = 25 mm, through which liquid flow may be assumed to maintain a uniform...
Consider a horizontal pin fin of 6-mm diameter and 60-mm length fabricated from plain carbon steel (k = 57 W/m K, 8 = 0.5). The base of the fin is maintained at 150C, while the quiescent ambient air...
Luyben and Vinante developed a distillation column model relating temperatures on the 4th and 17th trays from the bottom of the column (T4, T17,) to the reflux ratio R and the steam flow rate to the...
An equimolar mixture of helium and argon gases is to be used as the working fluid in a closed-loop gas-turbine cycle. The mixture enters the turbine at 2.5 MPa and 1300 K and expands isentropically...
Three infinite lines of charge, pl1 = 3 (nC/m), pl2 = _ 3 (nC/m), and pl3 = 3 (nC/m), are all parallel to the z-axis. If they pass through the respective points. P13 (0.b) E1 R3 E2 Pi2 (a.0) E:...
Pressurized steam at 450 K flows through a long, thin-walled pipe of 0.5-m diameter. The pipe is enclosed in a concrete casing that is of square cross section and 1.5 m on a side. The axis of the...
In Chapter 3 we assumed that, whenever fins are attached to a base material, the base temperature is unchanged. What in fact happens is that, if the temperature of the base material exceeds the fluid...
The flywheel shown has a radius of 600 mm, a mass of 144 kg, and a radius of gyration of 450 mm. An 18-kg block A is attached to a wire that is wrapped around the flywheel, and the system is released...
End corrections in tube viscometers (Fig. 7C.1)? In analyzing tube-flow viscometric data to determine viscosity, one compares pressure drop versus flow rate data with the theoretical expression (the...
What mass of AgBr dissolves in 200 mL of 0.200 M NaCN? Ag+ + 2CN--Ag(CN), 2 = 1.3 1021
When measuring small pressure differences with a manometer, often one arm of the manometer is inclined to improve the accuracy of reading. (The pressure difference is still proportional to the...
In the locked position shown, the toggle clamp exerts at A a vertical 270-lb force on the wooden block, and handle CF rests against the stop at G. Determine the force P required to release the clamp....
For the collar and rod of Prob. 12.56, and assuming that the coefficients of friction are ?s = 0.25 and ?k = 0.20, indicate whether the collar will slide on the rod if it is released in the position...
Determine the magnitude of the gripping forces exerted along line a on the nut when two 240-N forces are applied to the handles as shown. Assume that pins A and D slide freely in slots cut in the...
Consider a white Gaussian noise process of zero mean and power spectral density N0/2 that is applied to the input of the high-pass RL filter shown in Figure. (a) Find the autocorrelation function and...
Saturated steam at 110C is condensed in a shell-and-tube heat exchanger (1 shell pass; 2, 4,... tube passes) with a UA value of 2.5 kW/K. Cooling water enters at 40C. (a) Calculate the cooling water...
A gear-reduction unit uses the countershaft depicted in the figure. Find the two bearing reactions. The bearings are to be angular-contact ball bearings, having a desired life of 50 kh when used at...
The performance of a heat pump degrades (i.e., its COP decreases) as the temperature of the heat source decreases. This makes using heat pumps at locations with severe weather conditions...
Consider a Carnot heat-engine cycle executed in a steady-flow system using steam as the working fluid. The cycle has a thermal efficiency of 30 percent, and steam changes from saturated liquid to...
Air is used as the working fluid in a simple ideal Brayton cycle that has a pressure ratio of 12, a compressor inlet temperature of 300 K, and a turbine inlet temperature of 1000 K. Determine the...
A cylinder/piston arrangement contains 5 kg of water at 100C with x 20% and the piston, mP 75 kg, resting on some stops, similar to Fig. P5.35, the outside...
A wet-bulb thermometer consists of a mercury-in-glass thermometer covered with a wetted (water) fabric. When suspended in a stream of air, the steady-state thermometer reading indicates the wet-bulb...
Air at atmospheric pressure and a temperature of 25C is in parallel flow at a velocity of 5 m/s over a 1 -m-long flat plate that is heated with a uniform heat flux of 1250 W/m2 . Assume the flow is...
The objective of an experiment performed by our students is to determine the effect of pin fins on the thermal resistance between a flat plate and an airstream. A 25.9-mm-square polished aluminum...
The 360-mm-radius flywheel is rigidly attached to a 30-mm-radius shaft that can roll along parallel rails. Knowing that at the instant shown the center of the shaft has a velocity of 24 mm/s and an...
The directional total emissivity of nonmetallic materials may be approximated as , = n, cos , where n, is the normal emissivity. Show that the total hemispherical emissivity for such materials is 2/3...
Consider two aligned, parallel, square planes (0.4 m x 0.4 m) spaced 0.8 m apart and maintained at T 1 = 500 K and T 2 = 800 K. Calculate the net radiative heat transfer from surface 1 for the...
Determine the internal shear and moment in member ABC as a function of x, where the origin for x is atA. 45 15 m 5m--1.5m- 6 kN
Solve Prob. 515 using the distortion energy theory. If you have solved Prob. 515, compare the results and discuss the difference.
A vertical 12-cm diameter pistoncylinder device contains an ideal gas at the ambient conditions of 1 bar and 24C. Initially, the inner face of the piston is 20 cm from the base of the cylinder. Now...
Carbon dioxide enters an adiabatic nozzle at 8 MPa and 450 K with a low velocity and leaves at 2 MPa and 350 K. Using the generalized enthalpy departure chart, determine the exit velocity of the...
Members ABC and CDE are pin-connected at C and are supported by four links. For the loading shown, determine the force in each link. B C D E
The steel beam ABCD shown is simply supported at A and supported at B and D by steel cables, each having an effective diameter of 12 mm. The second area moment of the beam is I = 8(105) mm4. A force...
An insulated pistoncylinder device contains 5 L of saturated liquid water at a constant pressure of 175 kPa. Water is stirred by a paddle wheel while a current of 8 A flows for 45 min through a...
Consider two actual power plants operating with solar energy. Energy is supplied to one plant from a solar pond at 80C and to the other from concentrating collectors that raise the water temperature...
A steam power plant operates on an ideal reheat Rankine cycle between the pressure limits of 15 MPa and 10 kPa. The mass flow rate of steam through the cycle is 12 kg/s. Steam enters both stages of...
Locate the centroid (xc, yc) of the shaded area. Given: a = 1 in b = 6 in c = 3 in d = 3 in b.
Two forces P and Q are applied as shown to an aircraft connection. Knowing that the connection is in equilibrium and that the magnitudes of the forces exerted on rods A and B are F A = 600 lb and F B...
Forced conduction heat transfer from a flat plate (thermal boundary layer extends beyond the momentum boundary layer), show that the result analogous to Eq. 12.4-14 for > 1 is 2 3 1 37 1 315 Pr 140...
Quinone can be reduced to hydroquinone with an excess of electrolytically generated Sn(II): The polarity of the working electrode is then reversed, and the excess Sn(II) is oxidized with Br2...
A cast iron, T-type fitting is being produced for the oil drilling industry, using an air-set or no-bake sand for both the mold and the core. A silica sand has been used in combination with a...
The cable supports the loading shown. Determine the distance xB from the wall to point B. Given: W1 = 8 lb W2 = 15 lb a = 5 ft b = 8 ft c = 2 ft d = 3 ft XB OC W:
Sketch the variation of the velocity and thermal boundary layer thicknesses with distance from the leading edge of a flat plate for the laminar flow of air, water engine oil and mercury. For each...
A 3-m boom is acted upon by the 4-kN force shown. Determine the tension in each cable and the reaction at the ball-and-socket joint at A. 1.8m 18m. 12 EN
Consider a thermal storage system in which the phase change material (paraffin) is housed in a large container whose bottom, horizontal surface is maintained at T s = 50C by warm water delivered from...
A golfer aims his shot to clear the top of a tree by a distance h at the peak of the trajectory and to miss the pond on the opposite side. Knowing that the magnitude of v0 is 30 m/s, determine the...
Consider combustion of hydrogen gas in a mixture of hydrogen and oxygen adjacent to the metal wall of a combustion chamber. Combustion occurs at constant temperature and pressure according to the...
The figure shows a steel pressure cylinder of diameter 4 in which uses six SAE grade 5 steel bolts having a grip of 12 in. These bolts have a proof strength (see Chap. 8) of 85 kpsi for this size of...
Consider the venturi nozzle of Fig. 6.40c, with D = 5 cm and d = 3 cm. Air stagnation temperature is 300 K, and the upstream velocity V1 = 72 m/s. If the throat pressure is 124 kPa, estimate, with...
Determine by direct integration the moment of inertia of the shaded area with respect to the y axis. y=kx* +e
In the method of separation of variables (Section 4.2) for two-dimensional, steady-state conduction, the separation constant 2 in Equations 4.6 and 4.7 must be a positive constant. Show that a...
Water at 20C and a flow rate of 0.1 kg/s enters a heated, thin-walled tube with a diameter of 15 mm and length of 2 m. The wall heat flux provided by the heating elements depends on the wall...
A bullet is fired with a horizontal velocity of 500 m/s through a 3-kg block A and becomes embedded in a 2.5-kg block B. Knowing that blocks A and B start moving with velocities of 3 m/s and 5 m/s,...
If carbon dioxide is cooled at I atm. it condenses directly to a solid (dry ice) at 78.4C. The heat of sublimation at this temperature is H sub (78.4C) = 6030 cal/mol. (a) Calculate the heat removal...
A data acquisition system for environmental monitoring is used to record the temperature of an air stream as measured by a thermocouple. It shows an essentially sinusoidal variation after about 15 s....
Two 12 in long thin rectangular steel strips are placed together as shown. Using a maximum allowable shear stress of 12 000 psi, determine the maximum torque and angular twist, and the torsional...
A brick rectangular channel, with a slope of 0.002, is designed to carry 230 ft3/s of water in uniform flow. There is an argument over whether the channel width should be 4 ft or 8 ft. Which design...
Two steady flow of air enters a control volume, shown in Fig. P6.37. One is 0.025 kg/s flow at 350 kPa, 150C, state 1, and the other enters at 350 kPa, 15C, both flows with low...
It is known that a force with a moment of 1152 N m ⋅ about D is required to straighten the fence post CD. If the capacity of the winch puller AB is 2880 N, determine the minimum value of...
Consider a liquid metal (Pr < < 1) with free stream conditions u and T, in parallel flow over an isothermal flat plate at Ts- Assuming that u = U throughout the thermal boundary layer, write the...
The acceleration of slider A is defined by the relation a= ??2k??k2 ?? v2, where a and v are expressed in ft/s2 and ft/s, respectively, and k is a constant. The system starts at time t = 0 with x =...
A uniform rod of mass m is supported by a pin at A and a spring of constant k at B and is connected at D to a dashpot of damping coefficient c. Determine in terms of m, k, and c, for small...
Find the solution of Plot the solution for values of h = 1, 10, 100, and the limiting solution (h ? ?) from t = 0 to t = 2. Put all plots on the same graph. dx + 4x = f(t) di t <0 where f() -h 0 <1...
Consider the experimental step response data for the heat exchanger of Exercise 12.5. Determine the PI controller settings using the step response method and two controller tuning relations: (a)...
For the emitter-stabilized network of Fig. 5.171: a. Determine AvNL Zi and Zo. b. Sketch the two-port model of Fig. 5.63 with the values determined in part (a). c. Determine AVL and AVs. d. Change RS...
A force acts at the origin of a coordinate system in a direction defined by the angles x = 43.2 and z = 83.8. Knowing that the y component of the force is 50 lb, determine (a) The angle y, (b) The...
A continuous-time signal x c (t), with Fourier transform X c (j) shown in Figure, is sampled with sampling period T = 2 / 0 to form the sequence x[n] x c (nT). (a) Sketch the Fourier transform X(e j...
Determine by direct integration the centroid of the area shown. Express your answer in terms of a and h. x kay" y - kpz"
Two hemispheres are held together by a cord which maintains a spring under compression (the spring is not attached to the hemispheres). The potential energy of the compressed spring is 90 ft ? lb and...
A uniform slender rod AB is at rest on a frictionless horizontal table when end A of the rod is struck by a hammer which delivers an impulse that is perpendicular to the rod. In the subsequent...
Assume there exists some hypothetical metal that exhibits ferromagnetic behavior and that has (1) a simple cubic crystal structure (Figure), (2) an atomic radius of 0.153 nm, and (3) a saturation...
A train of four 55-gallon cannisters of activated carbon is to be used to reduce the nitroglycerine (NG) content of 400 gph of wastewater from 2,000 ppm by weight to less than 1 ppm. Each cannister...
For the Wood-Berry distillation column model in Example 18.1; (a) Which pairing of controlled and manipulated variables would you recommend based on steady-state considerations? (b) Which pairing...
Determine the components of reaction acting at the smooth journal bearings A, B, andC. 450 N 0,6 im 45 300 N m 0.4 m 0.8 m 0.4 m.
At the instant shown the angular velocity of the wheel is 2 rad/s clockwise and its angular acceleration is 3 rad/s2 counterclockwise, knowing that the wheel rolls without slipping, determine the...
Residence time distribution in tube flow, define the residence time function F(t) to be that fraction of the fluid flowing in a conduit which flows completely through the conduit in a time interval...
Hot air for a large-scale drying operation is to be produced by routing the air over a tube bank (unmixed), while products of combustion are routed through the tubes. The surface area of the...
Consider two bodies of identical mass m and specific heat c used as thermal reservoirs (source and sink) for a heat engine. The first body is initially at an absolute temperature T1 while the second...
The idea of using gas turbines to power automobiles was conceived in the 1930s, and considerable research was done in the 1940s and 1950s to develop automotive gas turbines by major automobile...
A thin brass rod of uniform cross section is bent into the shape shown. Locate its center of gravity. 0 300m s00
Consider the gas turbine cooling scheme of Example 4.4. In Problem 3.23, advantages associated with applying a thermal barrier coating (TBC) to the exterior surface of a turbine blade are described....
An electrical cable, experiencing a uniform volumetric generation q, is half buried in an insulating material while the upper surface is exposed to a convection processes (T, h). (a) Derive the...
You have been asked to determine the feasibility of using an impinging jet in a soldering operation for electronic assemblies. The schematic illustrates the use of a single, round nozzle to direct...
A 20-lb force F 1 and a 40- lb ft couple M 1 are applied to corner E of the bent plate shown. If F 1 and M 1 are to be replaced with an equivalent force-couple system (F 2 , M 2 ) at corner B and if...
Write the Ka and Kb reactions of NaHCO3.
When one knows the true values x1 and x2 and has approximations X1 and X2 at hand, one can see where errors may arise. By viewing error as something to be added to an approximation to attain a true...
Hot exhaust gases leaving an internal combustion engine at 400°C and 150 kPa at a rate of 0.8 kg/s is to be used to produce saturated steam at 200°C in an insulated heat exchanger. Water...
Consider the conditions of Example 3.12, except that the person is now exercising (in the air environment), which increases the metabolic heat generation rate by a factor of eight, to 5600 W/m3. At...
Consider the flow due to a vortex of strength K at the origin. Evaluate the circulation from Eq. (8.15) about the clockwise path from (a, 0) to (2a, 0) to (2a, 3π /2) to (a, 3π /2) and back to...