A thin rod of diameter D is initially in equilibrium with its surroundings, a large vacuum enclosure at temperature Tsur. Suddenly an electrical current I (A) is passed through the rod having an...

Heat transfer is not an intuitive process muses the Curious Cook. Does doubling the thickness of a hamburger approximately double the cooking time? What effect does the initial temperature have on...

A total of 2,000 gallons of 70 wt% ethanol in water, having a specific gravity of 0.871, is to be separated at 1 atm in a batch rectifier operating at constant distillate composition with a constant...

Given the Pitot stagnation temperature and pressure and the static-pressure measurements in Fig P9.22, estimate the air velocity V, assuming (a) Incompressible flow and (b) Compressible flow. Vi Air...

Baseboard heaters are basically electric resistance heaters and are frequently used in space heating. A home owner claims that her 5-year-old baseboard heaters have a conversion efficiency of 100...

Saturated refrigerant-134a vapor at 15 psia is compressed reversibly in an adiabatic compressor to 80 psia. Determine the work input to the compressor. What would your answer be if the refrigerant...

Determine the force in each member of the truss and state if the members are in tension or compression. The horizontal force component at A must be zero. Why? Units Used: kip = 103 lb Given: F1 = 600...

Airflow through a long, O.2-m-square air conditioning duct maintains the outer duct surface temperature at 10C. If the horizontal duct is uninsulated and exposed to air at 35C in the crawlspace...

A process consists of two stirred tanks with Input q and outputs T1 and T2 (see figure). To test the hypothesis that the dynamics in each tank are basically first order, a step change in q is made...

The parallel form of the PID controller has the transfer function given by Eq. 8-14. Many commercial analog controllers can be described by the series form given by Eq. 8-15. (a) For the simplest...

A piston/cylinder arrangement B is connected to a 1-m3 tank A by a line and valve, shown in Fig. P5.18. Initially both contain water with A at 100 kPa, saturated vapor and B at 400C, 300 kPa,...

Three loads are suspended as shown from cable ABCDE. Knowing that 12 dC = ft, determine (a) The components of the reaction at E, (b) The maximum tension in the cable. 5 ft -15 ft- 15 ft -15 ft E. de...

In Prob. 10.12, knowing that a = 42 in., b = 28 in., and W = 160lb, determine the tension T in cable AE when the door is held in the position for which BD = 42 in. Problem 10.12: An overhead garage...

A stream of water of cross-sectional area A and velocity v1 strikes a plate which is held motionless by a force P. Determine the magnitude of P, knowing that A = 500 mm2, v1 = 25 m/s and V =0. V P

Explain why it is preferable to separate a dilute mixture of benzoic acid in water by liquidliquid extraction rather than distillation.

(Each part of this problem is quite long and best worked by groups of students.) Peak intensities of the molecular ion region are listed in parts (a) - (g) and shown in the figure. Identify which...

Argon gas enters an adiabatic compressor at 120 kPa and 30C with a velocity of 20 m/s and exits at 1.2 MPa, 530C, and 80 m/s. The inlet area of the compressor is 130 cm2. Assuming the surroundings to...

An ideal Otto cycle has a compression ratio of 8. At the beginning of the compression process, air is at 95 kPa and 27C, and 750 kJ/kg of heat is transferred to air during the constant-volume...

Consider conditions for which a mercury-in-glass thermometer of 4-mm diameter is inserted to a length L through the wall of a duct in which air at 77C is flowing. If the stem of the thermometer at...

Illustrated is a rectangular steel bar with simple supports at the ends and loaded by a force F at the middle; the bar is to act as a spring. The ratio of the width to the thickness is to be about b...

Nitrogen gas at 60 kPa and 7C enters an adiabatic diffuser steadily with a velocity of 200 m/s and leaves at 85 kPa and 22C. Determine (a) The exit velocity of the nitrogen and (b) The ratio of the...

The eye hook has a positive locking latch when it supports the load because its two parts are pin-connected at A and they bear against one another along the smooth surface at B. Determine the...

Consider the same vortex filament as in Prob. 5.1. Consider also a straight line through the center of the loop, perpendicular to the plane of the loop. Let A be the distance along this line,...

An abrasive cutoff wheel has a diameter of 6 in, is 1/16 in thick, and has a 1-in bore. It weighs 6 oz and is designed to run at 10 000 rev/min. If the material is isotropic and = 0.20, find the...

A rigid tank is divided into two equal parts by a partition. One part of the tank contains 1.5 kg of compressed liquid water at 300 kPa and 60C and the other side is evacuated. Now the partition is...

The kinetic sculpture requires that each of the three pinned beams be in perfect balance at all times during its slow motion. If each member has a uniform weight density and length L, determine the...

Using the method of Sec. 7.6, solve Prob. 7.40. Problem 7.40: For the beam and loading shown, (a) Draw the shear and bending-moment diagrams, (b) Determine the maximum absolute values of the shear...

A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 150-mm diameter has an emissivity of 0.85 and an outer surface temperature of 400...

As an employee of the Los Angeles Air Quality Commission, you have been asked to develop a model for computing the distribution of NO 2 in the atmosphere. The molar flux of NO 2 at ground level, N''...

An ideal diesel engine has a compression ratio of 20 and uses air as the working fluid. The state of air at the beginning of the compression process is 95 kPa and 20C. If the maximum temperature in...

The column is used to support the upper floor. If a force F is applied perpendicular to the handle to tighten the screw, determine the compressive force in the column. The square-threaded screw on...

Air at 300 K and a flow rate of 3 kg/h passes upward through a 30-mm tube, as shown in the sketch. A thin film of water, also at 300 K, slowly falls downward on the inner surface of the tube....

A wet steam at 20bar with a quality of 0.97 (see Problem 7.32) leaks through a defective steam trap and expands to a pressure of 1 atm. The process can be considered to take place in two stages: a...

The noise equivalent bandwidth of a band pass signal is defined as the value of band width that satisfies the relation 2BS (fc) = P/2 where 2B is the noise equivalent bandwidth centered around the...

What mass of AgBr dissolves in 200 mL of 0.200 M NaCN? Ag+ + 2CN--Ag(CN), 2 = 1.3 1021

Listed below are six springs described in customary units and five springs described in SI units. Investigate these squared-and-ground-ended helical compression springs to see if they are solid-safe....

A heat exchanger is to cool ethylene glycol (cp = 2.56 kJ/kg C) flowing at a rate of 2 kg/s from 80C to 40C by water (cp = 4.18 kJ/kg C) that enters at 20C and leaves at 55C. Determine (a) the rate...

Consider cylindrical and spherical shells with inner and outer surfaces at r1 and r2 maintained at uniform temperatures Ts.1 and Ts.2 respectively. If there is uniform heat generation within the...

Consider the bonding operation described in Problem 3.103, which was analyzed under steady-state conditions. In this case however, the laser will be used to heat the film for a prescribed period of...

Fifty-thousand pounds per hour of a 20 wt% aqueous solution of NaOH at 120F is to be fed to an evaporator operating at 3.7 psia, where the solution is concentrated to 40 wt% NaOH. The heating medium...

Why is a just-in-time compiler useful for executing Java programs?

Refrigerant-134a at 700 kPa, 70C, and 8 kg/min is cooled by water in a condenser until it exists as a saturated liquid at the same pressure. The cooling water enters the condenser at 300 kPa and 15C...

Gold is commonly used in semiconductor packaging to form interconnections (also known as interconnects) that carry electrical signals between different devices in the package. In addition to being a...

A bolted lap joint using SAE grade 5 bolts and members made of cold-drawn SAE 1040 steel is shown in the figure. Find the tensile shear load F that can be applied to this connection if the following...

Blocks A and B weigh W1 and W2, respectively. Using the coefficients of static friction indicated, determine the greatest weight W of block E without causing motion. Given: W1 = 50 lb d = 12 W2 = 30...

A thick-walled steel pipe (k = 60 W/m K) carrying hot water is cooled externally by a cross-flow airstream at a velocity of 20 m/s and a temperature of 25C. The inner and outer diameters of the pipe...

Consider a homogeneous right circular cylinder of length L, radius R, and specific gravity SG = 0.5, floating in water (SG = 1) with its axis horizontal. Show that the body is stable if L/R > 2.0....

An air-conditioning system is used to maintain a house at a constant temperature of 20C. The house is gaining heat from outdoors at a rate of 20,000 kJ/h, and the heat generated in the house from the...

Determine the interior surface area of the brake piston. It consists of a full circular part. Its cross section is shown in the figure. Given: a = 40 mm b = 30 mm c = 20 mm d = 20 mm e = 80 mm f = 60...

The gate AB is located at the end of a 6-ft-wide water channel and is supported by hinges along its top edge A. Knowing that the floor of the channel is frictionless, determine the reactions at A and...

A fence consists of wooden posts and a steel cable fastened to each post and anchored in the ground at A and D. Knowing that the sum of the moments about the z axis of the forces exerted by the cable...

Consider a sequence of letters of the English alphabet with their probabilities of occurrence as given here: Letter a i l m n o p y Probability 0.1 0.1 0.2 0.1 0.1 0.2 0.1 0.1 Compute two different...

A gas refrigeration system using air as the working fluid has a pressure ratio of 4. Air enters the compressor at 27oC. The high-pressure air is cooled to 27oC by rejecting heat to the surroundings....

A thin smooth disk of diameter D is immersed parallel to a uniform stream of velocity U. Assuming laminar flow and using flat-plate theory as a guide, develop an approximate formula for the drag of...

Consider the 100-L Dewar (a rigid double-walled vessel for storing cryogenic liquids). The Dewar contains nitrogen at 1 atm, 90% liquid and 10% vapor by volume. The insulation holds heat transfer...

Equation of change for entropy this problem is an introduction to the thermodynamics of irreversible processes. A treatment of multi component mixtures is given in SS24.1 and 2. (a) Write an entropy...

A long cylindrical rod of very high emissivity is heat treated within a long, evacuated oven of square cross section as shown in the sketch. The oven walls exhibit blackbody behavior. Due to...

The coefficient of static friction between wedges B and C is s1 and between the surfaces of contact B and A and C and D, s2. If the spring is compressed to a distance when in the position shown,...

Air at I atm and 285 K enters a 2-m-long rectangular duct with cross section 75 mm by 150 mm. The duct is maintained at a constant surface temperature of 400 K and the air mass flow rate is 0.10...

A handball player throws a ball from A with a horizontal velocity v0. Knowing that d = 15 ft, determine(a) The value of v0 for which the ball will strike the corner C,(b) The range of values of v0...

Knowing that at the instant shown the angular velocity of rod AB is 15 rad/s clockwise, determine (a) The angular velocity of rod BD, (b) The velocity of the midpoint of rod BD. 200 mm 250 mm 200 600...

Viscous heat generation in a polymer melt rework the problem discussed in S10.4 for a molten polymer, whose viscosity can be adequately described by the power law model (see Chapter 8). Show that the...

A liquid storage system is shown below. The normal operating conditions are q 1 = 10 ft 3 /min, q 2 = 5 ft 3 /min, h = 4 ft. The tank is 6 ft in diameter, and the density of each stream is 60lb/ft....

The same 02-30 angular-contact ball bearing as in Prob. 1118 is to be subjected to a two-step loading cycle of 4 min with a loading of 18 kN, and one of 6 min with a loading of 30 kN. This cycle is...

A R-12 heat pump cycle shown in Fig P6.47 has a R-12 flow rate of 0.05 kg/s with 4 kW into the compressor. The following data are given Calculate the heat transfer from the compressor, the heat...

In the design of buildings, energy conservation requirements dictate that the exterior surface area, A" be minimized. This requirement implies that, for a desired floor space, there may be optimum...

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...

Nitrogen gas at 400 K and 300 kPa behaves as an ideal gas. Estimate the cp and cv of the nitrogen at this state, using enthalpy and internal energy data from Table A18, and compare them to the values...

The electrical-substitution radiometer shown schematically determines the optical (radiant) power of a beam by measuring the electrical power required to heat the receiver to the same temperature....

To assess the efficacy of different liquids for cooling an object of given size and shape by forced convection it is convenient to introduce figure of merit, FF, which combines the influence of an...

A process has been modeled and Laplace transformed to obtain the following two equations: where the outputs are Y1 and Y2, and the inputs are U1 and U2.(a) Find the transfer functions (b) What is the...

Suppose that a process can be adequately modeled by the first-order-plus-time-delay model in Eq. 12-10. (a) Calculate PI controller settings using the Hagglund-Astrom tuning relations in Table 12.4....

The drinking water needs of an office are met by cooling tab water in a refrigerated water fountain from 23 to 6C at an average rate of 10 kg/h. If the COP of this refrigerator is 3.1, the required...

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 passive solar house that is losing heat to the outdoors at an average rate of 50,000 kJ/h is maintained at 22°C at all times during a winter night for 10 h. The house is to be heated by 50...

Air is compressed from 14.7 psia and 60F to a pressure of 150 psia while being cooled at a rate of 10 Btu/lbm by circulating water through the compressor casing. The volume flow rate of the air at...

A force and a couple lying in the yz plane are applied to the end of a cantilevered wide-flange beam. This system is to be replaced with a single equivalent force. (a) For θ =15°, determine...

An object of irregular shape 1 m long maintained at a constant temperature of 100C is suspended in an airstream having a free stream temperature of OC, pressure of I atm, and a velocity of 120 m/s....

A diffuse, opaque surface at 700 K has spectral emissivities of ?? = 0 for 0 1000 Wim? 30% L= 1 m 6. (urti u/m)

The vectors P and Q are two adjacent sides of a parallelogram. Determine the area of the parallelogram when (a) (3 in.) (7 in.) (a P= i+ j2 in.)k and Q= (5 in.)i + (1 in.)j + (3 in.)k (b) P = (2...

A plate of thickness 2L = 25 mm at a temperature of 600C is removed from a hot pressing operation and must be cooled rapidly in order to achieve the required physical properties. The process engineer...

The motion of a particle on the surface of a right circular cylinder is defined by the relations, R = A = 2t, and z = At2 / 4, where A is a constant. Determine the magnitudes of the velocity and...

An aqueous solution containing 10 mol% isopropanol is fed at its bubble point to the top of a continuous stripping column, operated at atmospheric pressure, to produce a vapor containing 40 mol%...

Efficiency of a solar engine, a device for utilizing solar energy, developed by Abbot, consists of a parabolic mirror that focuses the impinging sunlight onto a Pyrex tube containing a high-boiling,...

Find RAB in the network in figure. ww- 6 kn 6 kN 2 kn RAB 6 B

The fermentation of corn produces a mixture of 3.3 mol% ethyl alcohol in water. If 20 mol% of this mixture is distilled at 1atm by a simple, batch distillation, calculate and plot the...

A theoretical force balance for the control valve shown in Figure can be expressed as Assuming the second-order differential equation is linear, find values of the coefficients of the equation (in...

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 stretch of a uniform rod in tension is given by the formula = Fl / AE. Suppose the terms in this equation are random variables and have parameters as follows Estimate the mean, the standard...

A ¾ -in-thick steel bar, to be used as a beam, is welded to a vertical support by two fillet welds as illustrated. (a) Find the safe bending force F if the permissible shear stress in the...

A ball of mass M rests between the grooves A and B of the incline and against a vertical wall at C. If all three surfaces of contact are smooth, determine the reactions of the surfaces on the ball....

It is well known that, although two materials are at the same temperature, one may feel cooler to the touch than the other. Consider thick plates of copper and glass, each at an initial temperature...

Special coatings are often formed by depositing thin layers of a molten material on a solid substrate. Solidification begins at the substrate surface and proceeds until the thickness S of the solid...

Multiple discharges into a common conduit (Fig. 7B.6) extend Example 7.6-1 to an incompressible fluid discharging from several tubes into a larger tube with a net increase in cross section. Such...

A three-phase generator step-up transformer is rated 26-kV: 345-kV, 850 MVA and has a series impedance of 0.0035 + j0.087 per unit on this base. It is connected to a 26-kV, 800-MVA generator, which...

The thin rod has a weight W and rests against the floor and wall for which the coefficients of static friction are ? A and ? B , respectively. Determine the smallest value of ? for which the rod will...

The figure shows the behavior of Pt and Ag cathodes at which reduction of H 3 O + to H 2 (g) occurs. Explain why the two curves are not superimposed. Pt Ag 0.5 -0.2-0.3-0.4-0.6-0.7-0.8-0.9 E(V vs....

LM35 is selected as asensors. Classify the sensor in all possible ways. Extract all performance characteristics Total Words: 457

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 a regenerative gas-turbine power plant with two stages of compression and two stages of expansion. The overall pressure ratio of the cycle is 9. The air enters each stage of the compressor...