Consider an airfoil in a wind tunnel (i.e., a wing that spans the entire test section). Prove that the lift per unit span can be obtained from the pressure distributions on the top and bottom walls...
Freeze drying is a technique for dehydrating substances at low temperatures, thereby avoiding the degradation that may accompany heating. The material to be dried is cooled to a temperature at which...
A glass window of width W = 1 m and height H = 2 m is 5 mm thick and has a thermal conductivity of kg = 1.4 W/m. K if the inner and outer surface temperatures of the glass are 15C and -20e,...
A transmission tower is held by three guy wires attached to a pin at A and anchored by bolts at B, C, and D. Knowing that the tower exerts on the pin at A an upward vertical force of 8 kN, determine...
A fractionating column equipped with a partial reboiler heated with steam, as shown in Figure 7.40, and with a total condenser, is operated continuously to separate a mixture of 50 mol% A and 50 mol%...
An insulated glass tube and condenser are mounted on a reboiler containing benzene and toluene. The condenser returns liquid reflux so that it runs down the wall of the tube. At one point in the tube...
Use activity coefficients to calculate the pH after 10.0 mL of 0.100 M trimethylammonium bromide were titrated with 4.0 mL of 0.100 M NaOH.
The 5-mm-thick bottom of a 200-mm-diameter pan may be made from aluminum (k = 240 W/m. K) or copper (k = 390 W/m. K). When used to boil water, the surface of the bottom exposed to the water is...
Steep safety ramps are built beside mountain highways to enable vehicles with defective brakes to stop. A 10-ton truck enters a 15? ramp at a high speed v0 = 108 ft/s and travels for 6 s before its...
A baseball player catching a ball can soften the impact by pulling his hand back. Assuming that a 5-oz ball reaches his glove at 96 mi/h and that the player pulls his hand back during the impact at...
A pistoncylinder device contains 0.15 kg of air initially at 2 MPa and 350C. The air is first expanded isothermally to 500 kPa, then compressed polytropically with a polytropic exponent of 1.2 to the...
A pistoncylinder device initially contains 1.2 kg of air at 700 kPa and 200°C. At this state, the piston is touching on a pair of stops. The mass of the piston is such that 600- kPa pressure is...
A tool used for fabricating semiconductor devices consists of a chuck (thick metallic, cylindrical disk) onto which a very thin silicon wafer (p = 2700 kg/m 3 c = 875 J/kg K, k = 177 W/m K) is...
Determine the magnitude and orientation, measured counterclockwise from the positive y axis, of the resultant force acting on the bracket. Given: FA = 700 N FB = 600 N θ = 20 deg φ = 30 deg...
For the given loading of the beam AB, determine the range of values of the mass of the crate for which the system will be in equilibrium, knowing that the maximum allowable value of the reactions at...
A homeowner, whose water pipes have frozen during a period of cold weather, decides to melt the ice by passing an electric current I through the pipe wall. The inner and outer radii of the wall are...
A 120-lb pilot flies a jet trainer in a half vertical loop of 3600-ft radius so that the speed of the trainer decreases at a constant rate. Knowing that the pilot??s apparent weights at points A and...
One thousand liters of a 95 wt% glycerol5% water solution is to be diluted to 60% glycerol by adding a 35% solution pumped from a large storage tank through a 5-cm ID pipe at a steady rate. The pipe...
In a particular application involving fluid flow at a rate nz through a circular tube of length L and diameter D, the surface heat flux is known to have a sinusoidal variation with x, which is of the...
An automobile travels to the right at a constant speed of 80 km/h. If the diameter of the wheel is 560 mm, determine the velocities of points B, C, D, and E on the rim of the wheel. D 30 B a 90 E 560...
A gas stream containing 40.0mole% hydrogen, 35.0% carbon monoxide, 20.0% carbon dioxide, and 5.0% methane is cooled from 1000C to 10C at a constant absolute pressure of 35.0 atm. Gas enters the...
Water flows through a circular nozzle, exits into the air as a jet, and strikes a plate. The force required to hold the plate steady is 70 N. Assuming frictionless one-dimensional flow, estimate (a)...
An insulated rigid tank contains 4 kg of argon gas at 450 kPa and 30°C. A valve is now opened, and argon is allowed to escape until the pressure inside drops to 200 kPa. Assuming the argon...
Based on the dimensionless conduction heat rates for cases 12-15 in Table 4.1 b, find shape factors for the following objects having temperature T1, located at the surface of a semi-infinite medium...
A 10 wedge is used to split a section of a log. The coefficient of static friction between the wedge and the log is 0.35. Knowing that a force P of magnitude 600 lb was required to insert the wedge,...
For an 85 wt% Pb-15 wt% Mg alloy, make schematic sketches of the microstructure that would be observed for conditions of very slow cooling at the following temperatures: 600C (1110F), 500C (930F),...
A household refrigerator that has a power input of 450 W and a COP of 2.5 is to cool five large watermelons, 10 kg each, to 8C. If the watermelons are initially at 20C, determine how long it will...
Derive the transient, two-dimensional finite-difference equation for the temperature at nodal point 0 located on the boundary between two different materials. Material A Ay kA. PAI CA Ax=Ay Material...
A supersonic flow at M 1 = 3, T 1 = 285 K, and p 1 = 1atm is deflected upward through a compression corner with 0 = 30.6 and then is subsequently expanded around a corner of the same angle such that...
Air enters a 40-cm-diameter cooling section at 1 atm, 32°C, and 30 percent relative humidity at 18 m/s. Heat is removed from the air at a rate of 1200 kJ/min. Determine (a) the exit temperature,...
Determine the smallest couple moment which can be applied to the wheel of weight W1 that will cause impending motion. The cord is attached to the block of weight W2, and the coefficients of static...
The 10-ft flagpole AC forms an angle of 30° with the z axis. It is held by a ball-and-socket joint at C and by two thin braces BD and BE. Knowing that the distance BC is 3 ft, determine the...
Rod AB moves over a small wheel at C while end A moves to the right with a constant velocity vA. Using the method of Sec. 15.9, derive expressions for the angular velocity and angular acceleration of...
The contact point between the femur and tibia bones of the leg is at A. If a vertical force of 175 lb is applied at this point, determine the components along the x and y axes. Note that the y...
Draw the shear and moment diagrams for the beam. Units Used: kN = 103 N Given: w = 3 kN/m F = 10kN L = 6 m
Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 MPa and -10C at a rate of 0.12 kg/s, and it leaves at 0.7 MPa and 50C. The refrigerant is cooled in the condenser...
Flow between coaxial cylinders and concentric spheres. (a) The space between two coaxial cylinders is filled with an incompressible fluid at constant temperature. The radii of the inner and outer...
A saturated-vapor mixture of maleic anhydride and benzoic acid containing 10 mol% acid is a by-product of the manufacture of phthalic anhydride. This mixture is distilled continuously at 13.3 kPa to...
Gaseous E10 fuel is 10 percent ethanol (C2H6O) and 90 percent octane (C8H18) on a kmol basis. This fuel is burned with 110 percent theoretical air. During the combustion process, 90 percent of the...
The Piper Cherokee (a light, single-engine general aviation aircraft) has a wing area of 170 ft 2 and a wing span of 32 ft. Its maximum gross weight is 24501b. The wing uses an NACA 65-415 airfoil,...
A surge tank system is to be installed as part of a pilot plant facility. The initial proposal calls for the configuration shown in figure. 4.3. Each tank is 5 ft high and 3 ft in diameter. The...
Two intermetallic compounds, AB and AB2, exist for elements A and B. If the compositions for AB and AB2 are 34.3 wt% A65.7 wt% B and 20.7 wt% A79.3 wt% B, respectively, and element A is potassium,...
Consider a diamond-wedge airfoil such as shown in Figure 9.24, with a half-angle = 10. The airfoil is at an angle of attack = 15 to a Mach 3 free stream. Using linear theory, calculate the lift and...
Draw the free-body diagram of member ABC which is supported by a smooth collar at A, roller at B, and short link CD. Explain the significance of each force acting on the diagram. (SeeFig) 2.5 kN 3 'm...
One kilogram of water (V1 = 1.003 cm3 kg-1) in a piston / cylinder device at 25oC and 1 bar is compressed in a mechanically reversible, isothermal process to 1.500 bar. Determine Q, W. (U, (H, and (5...
A two-dimensional rectangular plate is subjected to prescribed temperature boundary conditions on three sides and a uniform heat flux into the plate at the top surface. Using the general approach of...
Two hundred kilograms per hour of an aqueous solution containing 20.0mole% sodium acetate (NaC2H3O2) enters an evaporative crystallizer at 60C. When the solution is exposed to the low pressure in the...
An air standard dual cycle has a compression ratio of 15 and a cutoff ratio of 1.5. At the beginning of compression, p1 = 1 bar and T1 = 290 K. The pressure doubles during the constant volume heat...
Hot combustion gases enter the nozzle of a turbojet engine at 260 kPa, 747°C, and 80 m/s, and they exit at a pressure of 85 kPa. Assuming an isentropic efficiency of 92 percent and treating the...
A 4-kg uniform slender rod AB is held in position by two ropes and the link CA which has a negligible weight. After rope BD is cut the assembly rotates in a vertical plane under the combined effect...
Twenty liters of liquid n-propyl benzoate (C6H5CO2C3H7, SG = 1021) and 15 liters of liquid benzene are mixed and heated from 25C to 75C. Calculate the required heat input (kJ), using Kopps rule when...
A pistoncylinder device initially contains 50 L of liquid water at 40C and 200 kPa. Heat is transferred to the water at constant pressure until the entire liquid is vaporized. (a) What is the mass of...
A stream of air at 500C and 835torr with a dew point of 30C flowing at a rate of 1515 L/s is to be cooled in a spray cooler. A fine mist of liquid water at 25C is sprayed into the hot air at a rate...
A bar of a steel alloy that exhibits the stress-strain behavior shown in Figure is subjected to a tensile load; the specimen is 300 mm (12 in.) long, and of square cross section 4.5 mm (0.175 in.) on...
A cylinder of radius ro, length L, and thermal conductivity k is immersed in a fluid of convection coefficient hand unknown temperature T. At a certain instant the temperature distribution in the...
In the reservoir of a supersonic wind tunnel, the velocity is negligible, and the temperature is 1000 K. The temperature at the nozzle exit is 600 K. Assuming adiabatic flows through the nozzle;...
Consider the separation by distillation of a chlorination effluent to recover C2H5Cl. The feed is a bubble-point liquid at the column pressure of 240 psia with the following composition and K-values...
A vertical force P = 10 lb is applied to the ends of the 2-ft cord AB and spring AC. If the spring has an unstretched length of 2 ft, determine the angle ? for equilibrium. Take k = 15 lb/ft. 2 ft-...
Sketch all the possible stereoisomers of (a) Tetrahedral [Cd(H2O)2Cl2], (b) Square-planar [IrCI2(PH3)2]- , (c) Octahedral [Fe(o-phen) 2CI2]+,
A rectangular steel bar supports the two overhanging loads shown in the figure. Using superposition, find the deflection at the ends and at the center.
Is busy waiting always less efficient (in terms of using processor time) than a blocking wait? Explain.
Atmospheric air enters the heated section of a circular tube at a flow rate of 0.005 kg/s and a temperature of 20C. The tube is of diameter D = 50 mm, and full developed conditions with h = 25 W/m 2 ...
If the horizontal clamping force that the toggle clamp exerts on the smooth wooden block at E is NE = 200 N, determine the force applied to the handle of theclamp. 60 mm 50 mm 160 mm 75 mm
A natural gas containing 95 mole% methane and the balance ethane is burned with 20.0% excess air. The stack gas which contains no unburned hydrocarbons or carbon monoxide leaves the furnace at 900?C...
One integrated circuit design calls for the diffusion of arsenic into silicon wafers; the background concentration of As in Si is 2.5 x 1020 atoms/m3. The predeposition heat treatment is to be...
Compare the performance of C-SCAN and SCAN scheduling, assuming a uniform distribution of requests. Consider the average response time (the time between the arrival of a request and the completion of...
From the diagrams of 2p and 3p orbitals in Fig.19 and Fig.20, respectively, draw a rough graph of the square of the wave function for these orbitals in the direction of one of the lobes. Figure 12.19...
An escalator in a shopping center is designed to move 30 people, 75 kg each, at a constant speed of 0.8 m/s at 45 slope. Determine the minimum power input needed to drive this escalator. What would...
Consider the transmission case of Problem 1.23, but now allow for radiation exchange with the ground chassis, which may be approximated as large surroundings at Tsur = 30C. If the emissivity of the...
Plug flow with forced-convection heat transfer. Very thick slurries and pastes sometimes move in channels almost as a solid plug. Thus, one can approximate the velocity by a constant value v 0 over...
The cable at the end of the crane boom exerts a force of 250 lb on the boom as shown. Express F as a Cartesianvector. 70 30 F= 250 Ib
A memory manager for a variable-sized region strategy has a free list of blocks size 600, 400, 1000, 2200, 1600, and 1050 bytes. a. What block will be selected to honor a request for 1603 bytes using...
A 1.219-g sample containing (NH4)2SO4, NH4NO3, and nonreactive substances was diluted to 200 mL in a volumetric flask. A 50.00-mL aliquot was made basic with strong alkali, and the liberated NH3 was...
In the position shown, bar AB has an angular velocity of 4 rad/s clockwise. Determine the angular velocity of bars BD and DE. 250 mm B -200 mm 75 mm D E 150 mm
Find vC(t) for t > 0 in the circuit in Fig. P6.65. t=0 iL 1 1H 1A
The temperature in the reservoir of a supersonic wind tunnel is 519R. In the test section, the flow velocity is 1385 ft/s. Calculate the test-section Mach number. Assume the tunnel flow is adiabatic.
The physically realizable form of the PD transfer function is given in the first equation of Exercise 8.1.(a) Show how to obtain this transfer function with a parallel arrangement of two much simpler...
Nitrite ion, NO - 2 , is a preservative for bacon and other foods, but it is potentially carcinogenic. A spectrophotometric determination of NO - 2 makes use of the following reactions: Here is an...
What is the practical significance of harmonic currents and imbalance between phases?
If it is assumed that the plot in figure is for noncold-worked brass, determine the grain size of the alloy in Figure 7.19; assume its composition is the same as the alloy in Figure 7.15. 140 120 900...
If the resultant force acting on the bracket is directed along the positive y axis, determine the magnitude of the resultant force and the coordinate direction angles of F so that ? = 500 N 30 F 600 N
Determine the magnitudes of the components of force F = 400 N acting parallel and perpendicular to segment BC of the pipe assembly. F- 400 N 30 3m
Two rigid tanks are connected by a valve. Tank A is insulated and contains 0.2 m3 of steam at 400 kPa and 80 percent quality. Tank B is uninsulated and contains 3 kg of steam at 200 kPa and...
A Howe scissors roof truss is loaded as shown. Determine the force in members GI, HI, and HJ. TAN 1.5
When a man returns to his well-sealed house on a summer day, he finds that the house is at 32°C. He turns on the air conditioner, which cools the entire house to 20°C in 15 min. If the COP of...
Knowing that the pulley has a radius of 60 mm, determine the components of the reactions at A and E. 450 mm 450 mm 600 mm 240 mm C
Consider the arrangement of the three black surfaces shown, where A 1 is small compared to A 2 or A 3 . Determine the value of F 13 . Calculate the net radiation heat transfer from A 1 to A 3 if A 1...
The space truss is supported by a ball-and-socket joint at D and short links at C and E. Determine the force in each member and state if the members are in tension or compression. Take F1 = {-500k}...
Assume that a Pitot tube is inserted into the test-section flow of the wind tunnel in Prob. 3.4. The tunnel test section is completely sealed from the outside ambient pressure. Calculate the pressure...
Steam enters an adiabatic turbine at 8 MPa and 500°C with a mass flow rate of 3 kg/s and leaves at 30 kPa. The isentropic efficiency of the turbine is 0.90. Neglecting the kinetic energy change...
Natural gas that contains methane, ethane, and propane is to be burned with humid air. The adiabatic flame temperature is to be calculated from specified values of the following quantities: ycH 4 ,...
A 2-hp electric motor running at 1720 rev/min is to drive a blower at a speed of 240 rev/min. Select a V-belt drive for this application and specify standard V belts, sheave sizes, and the resulting...
Steam at 400C has a specific volume of 0.02 m3/kg determine the pressure of the steam based on (a) The ideal gas equation, (b) The generalized compressibility chart, and (c) The steam tables.
A 6-kg uniform cylinder can roll without sliding on a horizontal surface and is attached by a pin at point C to the 4-kg horizontal bar AB. The bar is attached to two springs, each of constant k =...
A seed crystal of diameter D (mm) is placed in a solution of dissolved salt, and new crystals are observed to nucleate (form at a constant rate r (crystals/min). Experiments with speed crystals of...
A load Q is applied to the pulley C, which can roll on the cable ACB. The pulley is held in the position shown by a second cable CAD, which passes over the pulley A and supports a load P. Knowing...
Compute the elastic moduli for the following polymers, whose stress-strain behaviors may be observed in the "Tensile Tests" module of Virtual Materials Science and Engineering (VMSE): (a)...
Knowing that crank AB rotates about point A with a constant angular velocity of 900 rpm clockwise, determine the acceleration of the piston P when = 120?. GIN.
The spectral emissivity of an opaque, diffuse surface is as shown. (a) If the surface is maintained at 1000 K, what is the total, hemispherical emissivity? (b) What is the total, hemispherical...
A vertical, thin pane of window glass that is 1 m on a side separates quiescent room air at T,i = 20C from quiescent ambient air at T.o = - 20C. The walls of the room and the external surroundings...