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...
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 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...
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...
Two traffic signals are temporarily suspended from a cable as shown. Knowing that the signal at B weighs 300 N, determine the weight of the signal at C. 4.0 m
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...
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...
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...
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...
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):...
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.
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...
Write the Ka reaction for trichloroacetic acid, Cl3CCO2H, for anilinium ion, and for lanthanum ion, La3+, EHN-
Gate AB is 7 ft into the paper and weighs 3000 lbf when submerged. It is hinged at B and rests against a smooth wall at A. Find the water level h which will just cause the gate to open. 2 4 ft Water...
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...
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
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....
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...
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
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...
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,...
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...
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...
Insulating power of a wall (Fig. 10A.6), the "insulating power" of a wall can be measured by means of the arrangement shown in the figure One places a plastic panel against the wall. In the panel two...
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...
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...
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:...
Neglecting friction, determine the tension in cable ABD and the reaction at support C. 25 in. 10 in. 10 in.
A simplified representation for cooling in very large-scale integration (VLSI) of microelectronics is shown in the sketch. A silicon chip is mounted in a dielectric substrate, and one surface of the...
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...
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...
Chain AB supports a horizontal, uniform steel beam having a mass per unit length of 85 kg/m. If the maximum tension in the cable is not to exceed 8kN, determine (a) The horizontal distance a from A...
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...
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....
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 rectangular tetrahedron has six edges of length a. A force P is directed as shown along edge BC. Determine the moment of P about edge OA.
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...
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 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...
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...
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...
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...
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...
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....
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 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)...
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
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?...
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...
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...
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...
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....
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...
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.
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 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 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 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...
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...
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...
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 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...
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...
Draw the free-body diagram of member AB, which is supported by a roller at A and a pin at B. Explain the significance of each force on the diagram. (SeeFig) 390 Ib 800 Ib ft -4 8 ft t- 3 ft 30
A binary geothermal power plant uses geothermal water at 160°C as the heat source. The cycle operates on the simple Rankine cycle with isobutane as the working fluid. Heat is transferred to the...
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 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...
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...
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...
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...
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...
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...
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...
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....
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...
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
A horizontal pipe discharges at point A a stream of water into a reservoir. Express the radius of curvature of the stream at point B in terms of the magnitudes of the velocities vA andvB.
A wheel of radius r and centroidal radius of gyration k is released from rest on the incline shown at time t = 0. Assuming that the wheel rolls without sliding, determine (a) The velocity of its...
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...
A gas mixture containing 85mole% methane and the balance oxygen is to be charged into an evacuated well-insulated 10-liter reaction vessel at 25C and 200 kPa. An electrical coil in the reactor which...
The window is held open by chain AB determine the length of the chain, and express the 50-lb force acting at A along the chain as a Cartesian vector and determine its coordinate directionangles. ft...
An adiabatic air compressor is to be powered by a direct-coupled adiabatic steam turbine that is also driving a generator. Steam enters the turbine at 12.5 MPa and 500°C at a rate of 25 kg/s and...
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...
A spherical elastic balloon initially containing 5 kg ammonia as saturated vapor at 20C is connected by a valve to a 3-m3 evacuated tank. The balloon is made such that the pressure inside is...
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...
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...
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.)
Determine the angles θ and φ made between the axes OA of the flag pole and AB and AC, respectively, of each cable. Given: FB = 55 N c = 2 m Fc = 40 N d = 4 m a = 6 m e = 4 m b = 1.5 m f = 3...
A small sphere of reference-grade iron with a specific heat of 447 J/kg 0 K and a mass of 0.515 kg is suddenly immersed in a water-ice mixture. Fine thermocouple wires suspend the sphere, and the...
A saturated vapor stream containing 10.9 mole% propane, 75.2% isobutene, and 13.9% n-butane passes from the top of a distillation column to a total condenser seventy-five percent of the condensate is...
A small fish pond is approximated by a half-body shape, as shown in Fig. P4.74 Point O, which is 0.5 m from the left edge of the pond, is a water source delivering about 0.63 m3/s per meter of depth...
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...
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...
At the instant shown the angular velocity of links BE and CF is 6 rad/s counterclockwise and is decreasing at the rate of 12 rad/s2. Knowing that the length of each link is 15 in. and neglecting the...
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)...
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...
A spring AB of constant k is attached to a support A and to a collar of mass m. The unstretched length of the spring is ??. Knowing that the collar is released from rest at x = x0 and neglecting...
You are trying to decide which of two automobiles to buy. The first is American-made, costs $14,500, and has a rated gasoline mileage of 28 miles/gal. The second car is of European manufacture, costs...