What are three contexts in which concurrency arise?

A gas-turbine power plant operates on the simple Brayton cycle between the pressure limits of 100 and 700 kPa. Air enters the compressor at 30C at a rate of 12.6 kg/s and leaves at 260C. A diesel...

A 25-mm-diameter, high-tension line has an electrical resistance of 10-4 n/m and is transmitting a current of 1000 A. (a) If ambient air at 10C and 5 m/s is in cross flow over the line, what is its...

Consider a sphere with a diameter of 20 mm and a surface temperature of 60C that is immersed in a fluid at a temperature of 30C and a velocity of 2.5 m/s. Calculate the drag force and the heat rate...

A liquid mixture consisting of 100 kmol of 60 mol% benzene, 25 mol% toluene, and 15 mol% o-xylene is flashed at 1 atm and 100C. (a) Compute the amounts of liquid and vapor products and their...

Consider a gas-fired boiler in which five coiled thin-walled, copper tubes of 25-mm diameter and 8-m length are submerged in pressurized water at 4.37 bars. The walls of the tubes are polished and...

Determine the magnitude and coordinate direction angles of the resultant force and sketch this vector on the coordinatesystem. F= 80 1b 30 F=130 lb

A 3-ft depth of stagnant water at 25oC lies on top of a 0.10-in. thickness of NaCl. At time < 0, the water is pure. At time = 0, the salt begins to dissolve and diffuse into the water. If the...

Carbon dioxide gas enters a throttling valve at 5 MPa and 100°C and leaves at 100 kPa. Determine the temperature change during this process if CO2 is assumed to be (a) An ideal gas and (b) A real...

Consider a velocity field where the x and y components of velocity are given by u = cy/(x2 + y2) and v = cx/(x2 + y2), where c is a constant. Obtain the equations of the streamlines.

The figure shows a cast-iron bearing block that is to be bolted to a steel ceiling joist and is to support a gravity load of 18kN. Bolts used are M24 ISO 8.8 with coarse threads and with 4.6-mm-thick...

A mass of 5 kg of saturated water vapor at 300 kPa is heated at constant pressure until the temperature reaches 200C. Calculate the work done by the steam during this process.

An insulated 5-m3 rigid tank contains air at 500 kPa and 57C. A valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 200 kPa. The air temperature...

Determine the components of the F force acting along the u and v axes. Given: θ1 = 70 deg θ2 = 45 deg θ3 = 60 deg F = 250 N

An automatic valve consists of a 225 Ã 225-mm square plate that is pivoted about a horizontal axis through A located at a distance h = 90 mm above the lower edge. Determine the depth of water...

The spectral, hemispherical absorptivity of an opaque surface is as shown. What is the solar absorptivity, ?S? If it is assumed that ?? = ?? and that the surface is at a temperature of 340 K. what is...

If ? = 45?, F 1 = 5kN, and the resultant force is 6kN directed along the positive y axis, determine the required magnitude of F 2 and its direction ?.

A 4-m x 5-m x 6-m room is to be heated by a baseboard resistance heater. It is desired that the resistance heater be able to raise the air temperature in the room from 7 to 23C within 15 min....

Air enters a 30-cm-diameter cooling section at 1 atm, 35°C, and 60 percent relative humidity at 120 m/min. The air is cooled by passing it over a cooling coil through which cold water flows. The...

The thin rod of length l is supported by the smooth tube. Determine the distance a needed for equilibrium if the applied load isP. B -P

Use Table 23-3 to predict the elution order of the following compounds from columns containing (a) poly(dimethylsiloxane), (b) (diphenyl)0.35(dimethyl)0.65polysiloxane, and (c) poly(ethylene glycol):...

The thermal characteristics of a small, dormitory refrigerator are determined by performing two separate experiments, each with the door closed and the refrigerator placed in ambient air at T = 25C....

A spherical, underwater instrument pod used to make soundings and to measure conditions in the water has a diameter of 85 mm and dissipates 300 W. (a) Estimate the surface temperature of the pod when...

Copper spheres of 20-mm diameter are quenched by being dropped into a tank of water that is maintained at 280 K. The spheres may be assumed to reach the terminal velocity on impact and to drop freely...

A platen of thermal conductivity k = 15 W/m K is heated by flow of a hot fluid through channels of width L = 20mm, with T ,i = 200C and hi = 500W/m 2 K. The upper surface of the platen is used to...

A spherical elastic balloon initially containing 5 kg ammonia as saturated vapor at 20C is connected by a valve to a 3-m3 evacuated tank. The balloon is made such that the pressure inside is...

In the planetary gear system shown, the radius of the central gear A is a, the radius of the planetary gears is b, and the radius of the outer gear E is a + 2b. The angular velocity of gear A is A...

A gas-phase decomposition reaction with stoichiometry 2A ? 2B + C follows a second-order rate law (see Problem 11.14): rd [mo1/(m3?s)] = kC2A where CA is the reactant concentration in moUrn3. The...

In a dairy plant, milk at 4°C is pasteurized continuously at 72°C at a rate of 12 L/s for 24 h a day and 365 days a year. The milk is heated to the pasteurizing temperature by hot water...

The quarter ring shown has a mass m and was cut from a thin, uniform plate. Knowing that r1= ½r2, determine the mass moment of inertia of the quarter ring with respect to (a) Axis AA²,...

Recovery of a solvent vapor from a gas stream by condensation can be achieved by cooling the gas, by compressing it, or by a combination of these operations. The greater the compression, the less...

Engine oil at 100C and a velocity of 0.1 m/s flows over both surfaces of a 1-m-long flat plate maintained at 20C. Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing...

A 500-g collar can slide without friction along the semicircular rod BCD. The spring is of constant 320 N/m and its undeformed length is 200 mm. Knowing that the collar is released from rest at B,...

A stream of water vapor flowing at a rate of 250mol/h is brought from 600C and 10bar to 100C and 1 atm. (a) Estimate the required cooling rate (kW) three ways: (I) from the steam tables (ii) using...

Determine the smallest force P that will cause impending motion. The crate and wheel have a mass of 50 kg and 25 kg, respectively. The coefficient of static friction between the crate and the ground...

Write the Ka reaction for trichloroacetic acid, Cl3CCO2H, for anilinium ion, and for lanthanum ion, La3+, EHN-

For the network of Fig. 4.125, determine: a. IB. b. IC. c. VCE. d. VC. 9+16 V 12 k VE B-120 Vca 9.1 k 15 k 6-12 V

Consider a system consisting of four resources of the same type that are shared by three processes, each of which needs at most two resources. Show that the system is deadlock free.

According to Archimedes principle, the mass of a floating object equals the mass of the fluid displaced by the object. Use this principle to solve the following problems. (a) A wooden cylinder 30.0cm...

Problem 2.95: The boom OA carries a load P and is supported by two cables as shown. Knowing that the tension is 510 N in cable AB and 765 N in cable AC, determine the magnitude and direction of the...

A two-dimensional rectangular plate is subjected to the boundary conditions shown. Derive an expression for the steady-state temperature distribution T(x, y). T= Ax b. T = 0 T = 0 T= 0 a

In an extrusion process, copper wire emerges from the extruder at a velocity V e and is cooled by convection heat transfer to air in cross flow over the wire, as well as by radiation to the...

The tractor has a weight of 8000 lb with center of gravity at G. Determine the greatest weight of the log that can be pushed up the incline. The coefficient of static friction between the log and the...

Steam flows steadily through a turbine at a rate of 45,000 lbm/h, entering at 1000 psia and 900F and leaving at 5 psia as saturated vapor, if the power generated by the turbine is 4 MW, determine the...

If neither the pin at A nor the roller at B can support a load no greater than Fmax determine the maximum intensity of the distributed load w, so that failure of a support does not occur. Units Used:...

Consider a flat plate subject to parallel flow (top and bottom) characterized by U = 5 m/s, T = 20C. (a) Determine the average convective heat transfer coefficient, convective heat transfer rate, and...

Flow near a wall suddenly set in motion (approximate solution) (Fig. 4B.2). Applu procedure like that of Example 4.4-1 to get an approximate solution for Example 4.1.1 (a) Integrate Eq. 4.4-1 over y...

Consider a rocket engine burning hydrogen and oxygen. The total mass flow of the propellant plus oxidizer into the combustion chamber is 287.2 kg/s. The combustion chamber temperature is 3600 K....

Steel is sequentially heated and cooled (annealed) to relieve stresses and to make it less brittle. Consider a 100-mm-thick plate (k = 45 W/m K. p = 7800 kg/m 3 c p = 500J/kg K) that is initially...

Three belts move over two pulleys without slipping in the speed reduction system shown. Point A on the input belt moves to the right with a constant speed of 0.6 m/s. Determine (a) The velocity of...

Neglecting friction, determine the tension in cable ABD and the reaction at support C. 25 in. 10 in. 10 in.

The vertical rear window of an automobile is of thickness L = 8 mm and height H = 0.5 m and contains fine-meshed heating wires that can induce nearly uniform volumetric heating, q (W/m3). (a)...

If a clamping force of 300 N is required at A, determine the amount of force F that must be applied to the handle of the toggleclamp. 70 mm -235 mm- 30 mm 275 mm 130 30 rhm

The shaft assembly is supported by two smooth journal bearings A and B and a short link DC. If a couple moment is applied to the shaft as shown, determine the components of force reaction at the...

A 1.1-kg ball A is falling vertically with a velocity of magnitude vA = 2.5 m/s when it is hit as shown by a 0.7-kg ball B which has a velocity of magnitude vB = 2 m/s. Knowing that the coefficient...

A thermo pane window consists of two pieces of glass 7 mm thick that enclose an air space 7 mm thick. The window separates room air at 20C from outside ambient air at - 10C. The convection...

In a thin-slab, continuous casting process, molten steel leaves a mold with a thin solid shell, and the molten material solidifies as the slab is quenched by water jets en route to a section of...

The spur gear is subjected to the two forces caused by contact with other gears. Determine the resultant of the two forces and express the result as a Cartesianvector. 60 F = 180 lb 135 F = 50 lb

You have been hired by a venture capitalist to evaluate a concept engine proposed by an inventor, who claims that the engine consumes 100 MW at a temperature of 500 K, rejects 40 MW at a temperature...

Replace the force and couple system by an equivalent force and couple moment at point O. Units Used: kN = 103 N Given: M = 8kNm = 60 deg a = 3 m f = 12 b = 3 m g = 5 c = 4 m F1 = 6kN d = 4m F2 = 4kN...

The fixture clamp consists of a square-threaded screw having a coefficient of static friction s mean diameter d, and a lead h. The five points indicated are pin connections. Determine the clamping...

The 8-ft-wide portion ABCD of an inclined, cantilevered walkway is partially supported by members EF and GH. Knowing that the compressive force exerted by member EF on the walkway at F is 5400 lb,...

The 100-lb boy at A is suspended from the cable that passes over the quarter circular cliff rock. What horizontal force must the woman at A exert on the cable in order to let the boy descend at...

Consider incompressible flow in the entrance of a circular tube, as in Fig. P3.53, the inlet flow is uniform, u1 = Uo. The flow at section 2 is developed pipe flow. Find the wall drag force F as a...

Consider a vortex filament of strength in the shape of a closed circular loop of radius R. Obtain an expression for the velocity induced at the center of the loop in terms of and R.

A 50.00-mL sample of a white dinner wine required 24.57 mL of 0.03291 M NaOH to achieve a phenolphthalein end point. Express the acidity of the wine in grams of tartaric acid (H2C4H4O6; 150.09 g/mol)...

If a force of magnitude P is applied to the grip of the clamp, determine the compressive force F that the wood block exerts on the clamp. Given: P = 10 lb a = 2 in b = 2 in c = 0.5 in d = 0.75 in e =...

A collar B, of mass m and negligible dimensions, is attached to the rim of a hoop of the same mass m and of radius r that rolls without sliding on a horizontal surface. Determine the angular velocity...

Water flowing through a large number of long, circular, thin-walled tubes is heated by means of hot parallel plates above and below the tube array. The space between the plates is evacuated and the...

A plane wall 7.5 cm thick, generates heat internally at the rate of 105 W/m3. One side of the wall is insulated, and the other side is exposed to an environment at 90?C. The convective heat transfer...

The two cables exert the forces shown on the pole. Determine the magnitude of the projected component of each force acting along the axis OA of the pole. Given: F1 = 50 N F2 = 35 N a = 1 m b = 3 m c...

The telephone pole of negligible thickness is subjected to the force F directed as shown. It is supported by the cable BCD and can be assumed pinned at its base A. In order to provide clearance for a...

The coefficient of static friction between the drum and brake bar is ?s = 0.4. If the moment M = 35 N ? m, determine the smallest force P that needs to be applied to the brake bar in order to prevent...

Water flowing at 2 kg/s through a 40-mm-diameter tube is to be heated from 25 to 75C by maintaining the tube surface temperature at 100C. (a) What is the required tube length for these conditions?...

Tartaric acid, H2C4H4O6, has two acidic hydrogens. The acid is often present in wines and precipitates from solution as the wine ages. A solution containing an unknown concentration of the acid is...

Air at 45C (dry bulb) and 10% relative humidity is to be humidified adiabatically to 60% relative humidity. (a) Use the psychometric chart to estimate the adiabatic saturation temperature of the air....

A composite beam is constructed by bolting four plates to four 60 Ã 60 Ã12-mm angles as shown. The bolts are equally spaced along the beam, and the beam supports a vertical load. As...

A long rod of 20-mm diameter and a thermal conductivity of 1.5 W/m K has a uniform internal volumetric thermal energy generation of 10 6 W/m3. The rod is covered with an electrically insulating...

Block C starts from rest and moves down with a constant acceleration. Knowing that after block A has moved 0.5 m its velocity is 0.2 m/s, determine(a) The accelerations of A and C,(b) The velocity...

Repeat Prob. 612 but with a steady torsional stress of 103 MPa, an alternating torsional stress of 69 MPa, and an alternating bending stress of 83 MPa.

A heat pump with refrigerant-134a as the working fluid is used to keep a space at 25°C by absorbing heat from geothermal water that enters the evaporator at 50°C at a rate of 0.065 kg/s and...

A rectangular forced air heating duct is suspended from the ceiling of a basement whose air and walls are at a temperature of Too = Tsur = 5C. The duct is 15 m long, and its cross-section is 350 mm x...

Viscous heating in slit flow, find the temperature profile for the viscous heating problem shown in Fig. 10.4-2, when given the following boundary conditions: at x = 0, T = T 0 ; at x - b, q r = 0.

Two airstreams are mixed steadily and adiabatically. The first stream enters at 32°C and 40 percent relative humidity at a rate of 20 m3/min, while the second stream enters at 12°C and 90...

Hot water is transported from a cogeneration power station to commercial and industrial users through steel pipes of diameter D = 150 mm, with each pipe centered in concrete (k = 1.4 W/m K) of...

The table lists the maximum and minimum hole and shaft dimensions for a variety of standard press and shrink fits. The materials are both hot-rolled steel. Find the maximum and minimum values of the...

The beam consists of three segments pin connected at B and E. Draw the shear and moment diagrams for the beam. Units Used: kN = 103 N Given: MA = 8 kN m F = 15 kN w = 3 kN/m a = 3 m b = 2 m c = 2 m...

A straight fin of uniform cross section is fabricated from a material of thermal conductivity 50 W/m. K, thickness w = 6 mm, and length L = 48 mm, and is very long in the direction normal to the...

The airstroke actuator at D is used to apply a force of F = 200 N on the member at B. Determine the horizontal and vertical components of reaction at the pin A and the force of the smooth shaft at C...

Before the trunk of a large tree is felled, cables AB and BC are attached as shown. Knowing that the tension in cables AB and BC are 777 N and 990 N, respectively, determine the moment about O of the...

The system shown is initially at rest. Neglecting the masses of the pulleys and the effect of friction in the pulleys, determine (a) The acceleration of each block, (b) The tension in eachcable. 20...

Determine the largest intensity w 0 of the distributed load that the beam can support if the beam can withstand a maximum bending moment of M max = 20 kN ? m and a maximum shear force of V max = 80...

Heat is to be removed from a reaction vessel operating at 75C by supplying water at 27C and 0.12 kg/s through a thin-walled tube of 15-mm diameter. The convection coefficient between the tube outer...

The path of a particle P is a limaon. The motion of the particle is defined by the relations ons r=b(2+cos?t) and ? = ? t, where t and ? are expressed in seconds and radians, respectively....

A 30-kg uniform thin panel is placed in a truck with end A resting on a rough horizontal surface and end B supported by a smooth vertical surface. Knowing that the deceleration of the truck is 4...

Demonstrate that (a) The value of ? in Equation 17.19 is 96,500 C/mol, and (b) At 25C (298 K), RT [Mf*] (M**] AV = (V - V)- (17.19) In n3 0.0592. -log x RT -In x= nF

During an expansion process, the pressure of a gas changes from 15 to 100 psia according to the relation P = aV + b, where a = 5 psia/ft3 and b is a constant. If the initial volume of the gas is 7...

A heat exchanger consists of a bank of 1200 thin-walled tubes with air in cross flow over the tubes. The tubes are arranged in-line, with 40 longitudinal rows (along the direction of airflow) and 30...

Would tris(2,2 -bipyridine)iron be a useful indicator for the titration of Sn 2+ with Mn(EDTA) - ? (Hint: The potential at the equivalence point must be between the potentials for each redox couple.)

A thick-walled, stainless steel (AISI 316) pipe of inside and outside diameters D; = 20 mm and Do = 40 mm is heated electrically to provide a uniform heat generation rate of q = 10 6 W/m3. The outer...