Determination of diffusivity for ether-air system the following data on the evaporation of ethyl ether (C 2 H 5 OC 2 H 5 ) have been tabulated by Jost. 2 The data are for a tube of 6.16 mm diameter,...

Consider an automobile with a mass of 5500lb m braking to a stop from a speed of 55 miles/h. (a) How much energy (Btu) is dissipated as heat by the friction of the braking process? (b) Suppose that...

A cross-flow heat exchanger used in a cardio-pulmonary bypass procedure cools blood flowing at 5 liter/min from a body temperature of 37C to 25C in order to induce body hypothermia, which reduces...

The force F = {25i ? 50j + 10k} N acts at the end of the pipe assembly. Determine the magnitude of the components F 1 and F 2 which act along the axis of AB and performance to it. 6 ft ft

The handle of a ladle used for pouring molten lead is 30 cm long. Originally the handle was made of 1.9 1.25 cm mild steel bar stock. To reduce the grip temperature, it is proposed to form the...

The figure shows a double-reduction helical gearset. Pinion 2 is the driver, and it receives a torque of 1200 lbf ã»in from its shaft in the direction shown. Pinion 2 has a normal...

Two L76 Ã 76 Ã 6.4-mm angles are welded to a C250 Ã 30 channel. Determine the moments of inertia of the combined section with respect to centroidal axes respectively...

The net potential energy between two adjacent ions, E N , may be represented by the sum of Equations 2.8 and 2.9; that is, Calculate the bonding energy E 0 in terms of the parameters A, B, and n...

A garden hose attached with a nozzle is used to fill a 20-gal bucket. The inner diameter of the hose is 1 in and it reduces to 0.5 in at the nozzle exit. If the average velocity in the hose is 8...

A 1.2-m3 insulated rigid tank contains 2.13 kg of carbon dioxide at 100 kPa. Now paddle-wheel work is done on the system until the pressure in the tank rises to 120 kPa. Determine (a) the actual...

In an arm wrestling contest, a 150-lb force P is applied to the hand of one of the contestants by his opponent. Knowing that AB = 15.2 in. and BC = 16 in., determine the moment of the force about C.

A foot valve for a pneumatic system is hinged at B. Knowing that = 28, determine the moment of the 4-lb force about point B by resolving the force into horizontal and vertical components. 65 ka. 3...

A 10 m3 rigid tank contains saturated vapor of H2O at 200oC. The tank is cooled until the quality drops to 80%. Determine the (a) Mass of H2O in the tank. (b) Drop in pressure (p). (c) Drop in...

The outer surface of a hollow sphere of radius r 2 is subjected to a uniform heat flux q 2 . The inner surface at r 1 is held at a constant temperature T .1 . (a) Develop an expression for the...

Consider the isentropic flow through a supersonic wind-tunnel nozzle. The reservoir properties are T0 = 500 K and p0 = 10atm. If p = 1atm at the nozzle exit, calculate the exit temperature and...

A liquid mixture containing 50 mole% propane, 30% n-butane, and 20% isobutene is stored in a rigid container at 77F. The container has a maximum allowable working pressure of 200 psig. The head space...

Using the method of joints, determine the force in each member of the truss shown. State whether each member is in tension or compression. 16 kN 13 KN 00 m D. 1.2 m 1.2 m

A plane wall of thickness 2 L = 40 mm and thermal conductivity k = 5 W/m K experiences uniform volumetric heat generation at a rate q, while convection heat transfer occurs at both of its surfaces...

The crane shown rotates at the constant rate 1 = 0.25 rad/s; simultaneously, the telescoping boom is being lowered at the constant rate 2 = 0.40 rad/s. Knowing that at the instant shown the length of...

Consider the non-lifting flow over a circular cylinder. Derive an expression for the pressure coefficient at an arbitrary point (r, ) in this flow, and show that it reduces to Eq. (3.101) on the...

The figure shows a steel countershaft that supports two pulleys. Pulley C receives power from a motor producing the belt tensions shown. Pulley A transmits this power to another machine through the...

A textile plant requires 4 kg/s of saturated steam at 2 MPa, which is extracted from the turbine of a cogeneration plant. Steam enters the turbine at 8 MPa and 500°C at a rate of 11 kg/s and...

A 3-m3 rigid tank contains nitrogen gas at 500 kPa and 300 K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 800 kPa. The work done during this process is...

The wind chill, which is experienced on a cold, windy day, is related to increased heat transfer from exposed human skin to the surrounding atmosphere. Consider a layer of fatty tissue that is 3 mm...

The exposed surface (x = 0) of a plane wall of thermal conductivity k is subjected to microwave radiation that causes volumetric heating to vary as where q"0 (W/m3) is a constant. The boundary at x =...

A stream of air (21 mole% O 2 , the rest N 2 ) flowing at a rate of 10.0 kg/h is mixed with a stream of CO 2 . The CO 2 enters the mixer at a rate of 20.0m 3 /h at 150C and 1.5 bar what is the mole...

A horizontal semitransparent plate is uniformly irradiated from above and below, while air at T? = 300 K flows over the top and bottom surfaces, providing a uniform convection heat transfer...

Phosphate at 0.01 M is one of the main buffers in blood plasma, whose pH is 7.45. Would phosphate be as useful if the plasma pH were 8.5?

One thousand kilograms per hour of a mixture containing equal parts by mass of methanol and water is distilled. Product streams leave the top and the bottom of the distillation column. The flow rate...

A 30-m3 tank contains 14 m3 of liquid n-butane in equilibrium with its vapor at 25(C. Estimate the mass of n-butanc vapor in the tank. The vapor pressure of n-butane at the given temperature is 2.43...

Estimate the force required to upset a 0.125-in.-diameter C74500 brass rivet in order to form a 0.25-in.-diameter head. Assume that the coefficient of friction between the brass and the tool-steel...

Repeat Prob. 612 but with a steady torsional stress of 138 MPa and an alternating bending stress of 69 MPa.

Sax and Lewis12 describe the hazards of breathing air containing appreciable amounts of an asphyxiant (a gas that has no specific toxicity but, when inhaled, excludes oxygen from the lungs). When the...

For materials A and B, whose spectral hemispherical emissivities vary with wavelength as shown below, how does the total, hemispherical emissivity vary with temperature? Explain briefly. 2 B

The resistances and leakage reactances of a 30-kVA, 60-Hz, 2400-V: 240-V distribution transformer are R1 = 0.68 R2 = 0.0068 , X11 = 7.8 X12 = 0.0780 where subscript 1 denotes the 2400-V winding...

Consider the conditions of Problem 1.22. However, now the plate is in a vacuum with a surrounding temperature of 25C. What is the emissivity of the plate? What is the rate at which radiation is...

Radioactive wastes are temporarily stored in a spherical container, the center of which is buried a distance of 10 m below the earth's surface. The outside diameter of the container is 2 m, and 500 W...

The diagonal of a long triangular bar is well insulated, while sides of equivalent length are maintained at uniform temperatures Ta and Tb. (a) Establish a nodal network consisting of five nodes...

A bowler projects a 200-mm-diameter ball of mass 5 kg along an alley with a forward velocity v0 of 5 m/s and a backspin 0 of 9 rad/s, knowing that the coefficient of kinetic friction between the ball...

Two thermocouples, one of them a known standard, are placed in an air stream whose temperature is varying sinusoidally. The temperature responses of the two thermocouples are recorded at a number of...

A wet cooling tower is to cool 60 kg/s of water from 40 to 26°C. Atmospheric air enters the tower at 1 atm with dry- and wet-bulb temperatures of 22 and 16°C, respectively, and leaves at...

Three forces and a couple act on crank ABC. For P = 25 N and α = 40°, (a) Determine the resultant of the given system of forces, (b) Locate the point where the line of action of the...

A gas storage tank with a floating roof receives a steady input of 540 m3/h of a natural gas. The rate of withdrawal of gas from the tank, vw, varies more or less randomly during the day and is...

A 2.5-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. The spring has an undeformed length of 4 in. and a constant k. The collar is at rest at C...

A variation of the indicator dilution method (see preceding problem) is used to measure total blood volume. A known amount of a tracer is injected into the bloodstream and disperses uniformly...

(a) Plot the spectrum of a PAM wave produced by the modulating signal m (t) Am cos (2imt) assuming a modulation frequency m = 0.25 Hz, sampling period Ts = 1 s, and pulse duration T = 0.45 s. (b)...

The figure shows a cantilever consisting of steel angles size 100 100 12 mm mounted back to back. Using superposition, find the deflection at B and the maximum stress in thebeam. 2.5 kN 2 m 1 kN/m...

Electricity and process heat requirements of a manufacturing facility are to be met by a cogeneration plant consisting of a gas turbine and a heat exchanger for steam production. The plant operates...

An array of 10 silicon chips, each of length L = 10 mm on a side, is insulated on one surface and cooled on the opposite surface by atmospheric air in parallel flow with T = 24C and U = 40 m/s....

Hot water at 50C is routed from one building in which it is generated to an adjoining building in which it is used for space heating. Transfer between the buildings occurs in a steel pipe (k = 60 W...

The signal m (t) = 6 sin (2t) volts is transmitted using a 4-bit binary PCM system. The quantizer is of the midrise type, with a step size of 1 volt. Sketch the resulting PCM wave for one complete...

Consider a well-insulated horizontal rigid cylinder that is divided into two compartments by a piston that is free to move but does not allow either gas to leak into the other side. Initially, one...

Determine the magnitude and coordinate direction angles of F3 so that resultant of the three forces acts along the positive y axis and has magnitude FR. Given: FR = 600 lb F1 = 180 lb F2 = 300 lb...

The support bracket shown is used to transport a cylindrical can from one elevation to another. Knowing that s = 0.30 between the can and the bracket, determine? (a) The magnitude of the upward...

The rectangular gate of width w is pinned at its center A and is prevented from rotating by the block at B. Determine the reactions at these supports due to hydrostatic pressure. Units Used: Mg = 103...

The control rod CE passes through a horizontal hole in the body of the toggle clamp shown. Determine (a) The force Q required to hold the clamp in equilibrium, (b) The corresponding force in link BD....

The C clamp shown in the figure for Prob. 87 uses a 5/8 in-6 Acme thread. The frictional coefficients are 0.15 for the threads and for the collar. The collar, which in this case is the anvil strikers...

The higher heating value of a hydrocarbon fuel CnHm with m 8 is given to be 1560 MJ/kmol of fuel. Then its lower heating value is (a) 1384 MJ/kmol (b) 1208 MJ/kmol (c) 1402 MJ/kmol (d) 1514 MJ/kmol...

If blocks D and F each have weight W1, determine the weight of block E if the sag is s. Neglect the size of the pulleys. Given: W1 = 5 lb s = 3 ft a = 4 ft E F D

Determine the tension in cable ABD and reaction at support C. 125 mm 175 mm -225 am

Ammonia is oxidized with air to form nitric oxide in the first step of the production of nitric acid. Two principal reactions occur: 4 NH 3 + 5O 2 ? 4NO + 6H 2 O 2 NH 3? + 3/2 O 2? ? N 2? + 3H 2 O A...

(a) If a rod of 1025 steel 0.5 m (19.7 in.) long is heated from 20 to 80C (68 to 176F) while its ends are maintained rigid, determine the type and magnitude of stress that develops. Assume that at...

A 2-kW baseboard electric resistance heater in a vacant room is turned on and kept on for 15 min. The mass of the air in the room is 75 kg, and the room is tightly sealed so that no air can leak in...

A 100-L rigid tank contains nitrogen (N2) at 900 K, 6 MPa. The tank is now cooled to 100 K. What are the work and heat transfer for this process?

Here are shown the atomic packing schemes for several different crystallographic directions for some hypothetical metal. For each direction the circles represent only those atoms contained within a...

Compare Nusselt predictions based on the Colburn. Dittus-Boelter, Sieder and Tate, and Gnielinski correlations for the fully developed turbulent flow of water in a smooth circular tube at Reynolds...

Pressure difference required for flow in pipe with elevation change (Fig. 6A.2). Water at 68?F is to be pumped through 95 ft of standard 3-in. pipe (internal diameter 3.068 in.) into an overhead...

A boiler used to generate saturated steam is in the form of an un-finned, cross-flow heat exchanger, with water flowing through the tubes and a high-temperature gas in cross flow over the tubes. The...

The "crossed-strings" method of Hottel [13] provides a simple means to calculate view factors between surfaces that are of infinite extent in one direction. For two such surfaces (a) with...

A wind turbine is rotating at 15 rpm under steady winds flowing through the turbine at a rate of 42,000 kg/s. The tip velocity of the turbine blade is measured to be 250 km/h. If 180 kW power is...

Combustion gases enter an adiabatic gas turbine at 1540F and 120 psia and leave at 60 psia with a low velocity. Treating the combustion gases as air and assuming an isentropic efficiency of 82...

Bar AC supports two 100-lb loads as shown. Rollers A and C rest against frictionless surfaces and a cable BD is attached at B. Determine (a) The tension in cable BD, (b) The reaction at A, (c) The...

Gas-mixture viscosities at low density. The following data 2 are available for the viscosities of mixtures of hydrogen and Freon-12 (dichlorodifluoromethane) at 25 o C and 1 atm: Mole fraction of H 2...

On a cool day in April a scantily clothed runner is known to lose heat at a rate of 500 W because of convection to the surrounding air at T = 10oC. The runner's skin remains dry and at a temperature...

Bar AB is rotating clockwise and, at the instant shown, the magnitude of the velocity of point G is 3.6 m/s. Determine the angular velocity of each of the three bars at that instant. 120 mm B 145 120...

The radiant energy incident on the earths surface on a sunny day is roughly 900 W/m2. Collecting and focusing sunlight and using the focused beam to heat a fluid is an old idea, and as the...

Solar flux of 900 W/m2 is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1. The air and surroundings are at 17C and the convection heat...

A force P is applied to the lever of an arbor press. Knowing that P lies in a plane parallel to the y z plane and that 230 lb M x = in., M y = 200 lb in., and M z = 35 lb in., determine the...

Determine the internal forces at point J of the structure shown. -20 ma 225 60 mm

An air conditioner is designed to bring 10.000 ft 3 /min of outside air (90F. 29.8 in Hg, 88% relative humidity) to 40F, thereby condensing a portion of the water vapor, and then to reheat the air,...

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

A cylinder having a piston restrained by a linear spring (of spring constant 15 kN/m) contains 0.5 kg of saturated vapor water at 120C, as shown in Fig. P5.57. Heat is transferred to the water,...

A desktop computer is to be cooled by a fan whose flow rate is 0.34 m3/min. Determine the mass flow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m3. Also, if...

Derive the velocity potential for a doublet; i.e., derive Eq. (3.88).

The following two reactions take place in a gas-phase reactor: If the system comes to equilibrium at 3000 K and 1 atm, the product gas mole fractions satisfy the relations (a) Let n A0 . . . n E0 be...

An adiabatic pump is to be used to compress saturated liquid water at 10 kPa to a pressure to 15 MPa in a reversible manner. Determine the work input using (a) Entropy data from the compressed liquid...

Consider a rectangular fin that is used to cool a motorcycle engine. The fin is 0.15 m long and at a temperature of 250C, while the motorcycle is moving at 80 km/h in air at 27C. The air is in...

I. M. Appelpolscher, supervisor of the process control group of the Ideal Gas Company, has installed a 25 x 40 x 5-ft swimming poe1 in his backyard. The poo1 contains level and temperature sensors...

The curved rod lies in the x-y plane and has a radius r. If a force F acts at its end as shown, determine the moment of this force about point B. Given: F = 80 N c = 3 m a = 1 m r = 3 m b = 2 m...

A 12-in.-radius cylinder of weight 16 lb rests on a 6-lb carriage. The system is at rest when a force P of magnitude 2.5 lb is applied as shown for 1.2 s. Knowing that the cylinder rolls without...

Calculate H for each of the following processes. In each case, restate your result as a specific enthalpy relative to a reference state. [The solutionwhich you should verifyand the restatement for...

Fill out the following table for substance water

Determine the reactions at the beam supports for the given loading when 0 1.5 w = 5 kN/m. 3.5 kN/m to

Estimate values of the mass diffusivity DAB for binary mixtures of the following gases at 350K and 1 atm: ammonia-air and hydrogen-air.

A container filled with 45 kg of liquid water at 95°C is placed in a 90-m3 room that is initially at 12°C. Thermal equilibrium is established after a while as a result of heat transfer...

Consider the isentropic flow through a supersonic nozzle. If the test-section conditions are given by p = 1atm, T = 230 K, and M = 2, calculate the reservoir pressure and temperature.

Air at 90C and 1.00 atm (absolute) contains 10.0mole% water. A continuous stream of this air enters a compressorcondenser, in which the temperature is lowered to 15.6C and the pressure, is raised to...

The air in a building is to be maintained at 25C and 55% relative humidity by passing outside air through a water spray. The air enters the spray chamber at 32C and 70% relative humidity, leaves the...

A bituminous coal is burned with air in a boiler furnace, The coal is fed at a rate of 40,000 kg/h and has an ultimate analysis of 76 wt% C, 5% H, 8% 0, negligible amounts of N and S. and 11%...

Determine the reactions at the beam supports for the given loading. 200 lh/ft B. 3 ft