Knowing that P = 5 lb, replace the three couples with a single equivalent couple, specifying its magnitude and the direction of its axis. Kiu.
An angular-contact, inner ring rotating, 02-series ball bearing is required for an application in which the life requirement is 50 000 h at 480 rev/min. The design radial load is 610 lbf. The...
An elevator starts from rest and moves upward, accelerating at a rate of 4 ft/s2 until it reaches a speed of 24 ft/s, which it then maintains. Two seconds after the elevator begins to move, a man...
Determine the single equivalent force and the distance from end A to its line of action for the beam and loading shown when (a) 200 B N, F= ↓ MB=100 N m, (b) B 100 N, F= ↑ MB = −600 N...
A flat-belt idler pulley is molded from polycarbonate with a bronze bushing. Knowing that the densities of polycarbonate and bronze are 1250 kg/m3 and 8800 kg/m3, respectively, determine the x...
Gases are often used instead of liquids to cool electronics in avionics applications because of weight considerations. The cooling systems are often closed so that coolants other than air may be...
A 4-kg projectile is fired vertically with an initial velocity of 90 m/s, reaches a maximum height and falls to the ground. The aerodynamic drag D has a magnitude D = 0.0024 v2 where D and v are...
The following data apply to a 125-kW, 2300-V, three-phase, four pole, 60-Hz squirrel-cage induction motor: Stator-resistance between phase terminals = 2.23 . No-load test at rated frequency and...
The pin-connected mechanism is constrained by a pin at A and a roller at B. Determine the force P that must be applied to the roller to hold the mechanism in equilibrium when ? = 30 o . The spring is...
Air enters the evaporator section of a window air conditioner at 14.7 psia and 90F with a volume flow rate of 200 ft3/min Refrigerant-134a at 20 psia with a quality of 30 percent enters the...
An insulated 150-ft3 rigid tank contains air at 75 psia and 140F. A valve connected to the tank is opened, and air is allowed to escape until the pressure inside drops to 30 psia. The air temperature...
A series RLC circuit is connected to a generator with a voltage vs (t) = Vo cos (wt + π/3) (V). (a) Write down the voltage loop equation in terms of the current i (t), R, L, C, and vs (t). (b)...
Find the missing properties a. H2O T 250C, v 0.02 m3/kg P ? u ? b. N2 T 277C, P 0.5 MPa...
Determine by direct integration the centroid of the area shown. R R
The cover plate of a flat-plate solar collector is at 15C, while ambient air at 10C is in parallel flow over the plate, with U = 2 m/s. (a) What is the rate of convective heat loss from the plate?...
The 300-mm uniform rod BD of mass 3 kg is connected as shown to crank AB and to collar D of negligible mass, which can slide freely along a horizontal rod. Knowing that crank AB rotates...
You want a pot of water to boil at 105oC. How heavy a lid should you put on the 15 cm diameter pot when Patm = 101 kPa?
A row of regularly spaced cylindrical heating elements is used to maintain an insulated furnace wall at 500 K. The opposite wall is at a uniform temperature of 300 K. The insulated wall experiences...
A gas mixture at 20C, 125 kPa is 50% N2, 30% H2O and 20% O2 on a mole basis. Find the mass fractions, the mixture gas constant and the volume for 5 kg of mixture.
Assuming the upward reaction of the ground on beam AB to be uniformly distributed and knowing that a = 0.3m, (a) Draw the shear and bending moment diagrams, (b) Determine the maximum absolute values...
Saturated steam at 4 bars absolute pressure with a mean velocity of 3 m/s flows through a horizontal pipe whose inner and outer diameters are 55 and 65 mm, respectively. The heat transfer coefficient...
Nitrogen gas can be injected into oil wells to increase the recovery of crude oil (enhanced oil recovery). Usually, natural gas is produced with the oil and it is desirable to recover the nitrogen...
Beginning with the free convection correlation of the form given by Equation 9.24, show that for air at atmospheric pressure and a film temperature of 400 K. the average heat transfer coefficient for...
Heat loss from a rectangular fin calculates the heat loss from a rectangular fin (see Fig. 10.7-1) for the following conditions: Air temperature 350F Wall temperature 500F Thermal conductivity of fin...
At 45 o C, 1,000 kg/h of a mixture of 0.80 mass fraction docosane and 0.20 mass fraction diphenylhexane is to be extracted with pure furfural to remove some of the diphenylhexane from the feed....
Steel tubes with a Youngs modulus of 207 GPa have the specifications: Inner Tube 25 0.050 mm 500.010mm Outer Tube 49.98 +0.010 mm 750.10mm ID OD
The currents iLa (t) and iC (t) of the inductor and capacitor in the circuit shown can be drawn as phasors in a phasor diagram. Use a phasor diagram to show that iL(t) + iC (t) = iS(t). i 1 c(t) 10 mH
An ideal Otto cycle with air as the working fluid has a compression ratio of 8. The minimum and maximum temperatures in the cycle are 540 and 2400 R. Accounting for the variation of specific heats...
Two loads are suspended as shown from cable ABCD. Knowing that dC = 0.75 m, determine (a) The distance dB, (b) The components of the reaction at A, (c) The maximum tension in the cable. de 2.25 kN 3...
Each of the gears A and B has a weight of 5 lb and a radius of gyration of 4 in., while gear C has a weight of 25 lb and a radius of gyration of 7.5 in. A couple M of magnitude 6.75 lb ??ft is...
Forced-convection heat transfer from an isolated sphere (a) A solid sphere 1 in. in diameter is placed in an otherwise undisturbed air stream, which approaches at a velocity of 100 ft/s, a pressure...
A separately-excited dc motor is mechanically coupled to a three-phase, four-pole, 30-kVA, 460-V, cylindrical-pole synchronous generator. The dc motor is connected to a constant 230-V dc supply, and...
A transmission line operating at 125 MHz has Z0 - 40, a 0.02 (Np/m), and B 0.75 rad/m. Find the line parameters R`, L`, G`, and C`.
Solve Prob. 4.17 assuming that the 330-N force is replaced with an 82.5-N m clockwise couple. Problem 4.17: Determine the reactions at A and B when (a) α = 0, (b) α...
Determine the force in members DG and FH of the truss shown. -6t -- 6 ft- 6it --6t--6t -- 6 it-
Mixing of two ideal-gas streams, (a) Calculate the resulting velocity, temperature, and pressure when the following two air streams are mixed in an apparatus such as that described in Example 15.3-2....
Suppose R = 3, 2, 4, 3, 4, 2, 2, 3, 4, 5, 6, 7, 7, 6, 5, 4, 5, 6, 7, 2, 1 is a page reference stream. a. Given a page frame allocation of 3 and assuming the primary memory is initially unloaded, how...
For the balanced chemical equation 3Cu(s) + 2NO3(aq) + 8H+(aq) ( 3Cu2+(aq) + 4H2O() + 2NO(g) How many moles of Cu2+ are formed when 55.7 mol of H+ are reacted?
A transmission line of length l connects a load to a sinusoidal voltage source with an oscillation frequency f. assuming the velocity of wave propagation on the line is c, for which of the following...
A parallel RLC resonant circuit with a resonant frequency of 20,000 rad/s has an admittance at resonant of 1mS. If the capacitance of the network is 2F, find the values of R and L.
Problems 112 and 113 raise the question of the reliability of the bearing pair on the shaft. Since the combined reliabilities R is R1 R2 , what is the reliability of the two bearings (probability...
Our D = 0.625-in-diameter hose is too short, and it is 125 ft from the d = 0.375-in-diameter nozzle exit to the garden. If losses are neglected, what is the minimum gage pressure required, inside the...
The following turbulent-flow velocity data u(y), for air at 75F and 1 atm near a smooth flat wall, were taken in the University of Rhode Island wind tunnel: y, in: 0.025 0.035 0.047 0.055 0.065 u,...
A handheld pump for a bicycle has a volume of 25 cm3 when fully extended. You now press the plunger (piston) in while holding your thumb over the exit hole, so that an air pressure of 300 kPa is...
The machine component shown was cut from a thin, uniform plate. Denoting the mass of the component by m, determine its mass moment of inertia with respect to (a) The axis BB, (b) The centroidal axis...
The beam is to be hoisted using two chains. If the resultant force is to be 600 N, directed along the positive y axis, determine the magnitudes of forces F A and F B acting on each chain and the...
Your boss has discussed implementing a level controller on a troublesome process tank that contains a boiling liquid. Someone told him that a level transmitter used with such a system has a very...
Complete this table for H2O: T, C 140 v, m3/kg 0.05 P kPa Phase description Saturated liquid 125 500 750 0.140
Consider a mixture of two gases A and B. Show that when the mass fractions mfA and mfB are known, the mole fractions can be determined from where MA and MB are the molar masses of A and B.
A steady supply of 1.0 m3/s air at 25C, 100 kPa, 50% relative humidity is needed to heat a building in the winter. The outdoor ambient is at 10C, 100 kPa, 50% relative humidity. What...
The 2.5-kg slender rod AB is released from rest in the position shown and swings to a vertical position where it strikes the 1.5-kg slender rod CD. Knowing that the coefficient of restitution between...
A thin disk of weight W = 10 lb rotates with an angular velocity w2 with respect to arm ABC, which itself rotates with an angular velocity w1 about the y axis. Knowing that w1 = 5 rad/s and w2 = 15...
Heat transfer in laminar tube flow, One hundred pounds per hour of oil at 100F is flowing through a 1-in.i.d. Copper tube, 20ft long the inside surface of the tube is maintained at 215F by condensing...
It is desired to control the exit temperature T 2 of tie heat exchanger shown in Fig. E. by adjusting the steam flow rate w s . Unmeasured disturbances occur in inlet temperature T 1 . The dynamic...
A spur gearset has 17 teeth on the pinion and 51 teeth on the gear. The pressure angle is 20 and the overload factor Ko = 1. The diametral pitch is 6 teeth/in and the face width is 2 in. The pinion...
Pressure transducers are commonly used to measure pressure by generating analog signals usually in the range of 4 mA to 20 mA or 0 V-dc to 10 V-dc in response to applied pressure. The system whose...
The staged system model for a three-stage absorber is presented in Eqs. (2?73)?(2?75), which are in state space form. A numerical example of the absorber model suggested by Wong and Luus 2 has the...
A full journal bearing has a journal with a diameter of 2.000 in and a unilateral tolerance of 0.0012 in. The bushing has a bore with a diameter of 2.0024 and a unilateral tolerance of 0.002 in. The...
Consider a heat engine and heat pump connected as shown in figure P.7.38. Assume TH1 = TH2 > Tamb and determine for each of the three cases if the setup satisfy the first law and/or violates the 2nd...
A process has the transfer function, G(s) 2e0.2t/ (s + 1). Compare the PI controller settings for the following design approaches: (a) Direct Synthesis method (c = 0.2) (b) Direct Synthesis method (c...
Rain is falling on a poorly designed 150-m2 flat roof of a contemporary home. The design flaw requires the water level on the roof to reach approximately 5 cm above the plane of the roof before the...
A grade beam AB supports three concentrated loads and rests on soil and the top of a large rock. The soil exerts an upward distributed load, and the rock exerts a concentrated load ad RR as shown....
A small disk 5 mm in diameter is positioned at the center of an isothermal hemispherical enclosure. The disk is diffuse and gray with an emissivity of 0.7 and is maintained at 900 K. The...
At temperatures between 775C (1048 K) and 1100C (1373 K), the activation energy and preexponential for the diffusion coefficient of Fe 2+ in FeO are 102,000 J/mol and 7.3 10 -8 m 2 /s, respectively....
A hydrofoil 50 cm long and 4 m wide moves at 28 kn in seawater at 20°C. Using flat-plate theory with Retr = 5E5, estimate its drag, in N, for (a) a smooth wall and (b) a rough wall, ε =...
A passive solar house that is losing heat to the outdoors at 3C at an average rate of 50,000 kJ/h is maintained at 22C at all times during a winter night for 10 h. The house is to be heated by 50...
Determine the average convection heat transfer coefficient for the 2.5-m-high vertical walls of a home having respective interior air and wall surface temperatures of (a) 20 and 10C and (b) 27 and 37C
A horizontal tube 1 m long with a surface temperature of 70C is used to condense saturated steam at 1 atm. (a) What diameter is required to achieve a condensation rate of 125 kg/h? (b) Plot the...
A slender rod of length l is pivoted about a point C located at a distance b from its center G. It is released from rest in a horizontal position and swings freely. Determine (a) The distance b for...
A circular metal disk having a diameter of 0.4 m is placed firmly against the ground in a barren horizontal region where the earth is at a temperature of 280 K. The effective sky temperature is also...
Determine the force components acting on the ball-and- socket at A, the reaction at the roller B and the tension on the cord CD needed for equilibrium of the quarter circularplate. 350 N 200 N 200 N...
In a steam heating system, air is heated by being passed over some tubes through which steam flows steadily. Steam enters the heat exchanger at 30 psia and 400F at a rate of 15 lbm/min and leaves at...
In large steam power plants, the feedwater is frequently heated in a closed feedwater heater by using steam extracted from the turbine at some stage. Steam enters the feedwater heater at 1 MPa and...
A rod of 10-mm diameter and 250-mm length has one end maintained at 100C. The surface of the rod experiences free convection with the ambient air at 25C and a convection coefficient that depends on...
Average heat transfer coefficients (Fig. 14A.1), Ten thousand pounds per hour of an oil with a heat capacity of 0.6 Btu/lb m F is being heated from 100F to 200F in the simple heat exchanger shown in...
Assume a system with four resource types, C = , and the maximum claim table shown in Figure below. The resource allocator is considering allocating resources according to the table shown in Figure....
If the coefficient of static friction between the collars A and B and the rod is ? s = 0.6, determine the maximum angle for the system to remain in equilibrium, regardless of the weight of cylinder...
(a) For laminar draining of a wide thin sheet of water on pavement sloped at angle θ, as in Fig. P4.36, show that the flow rate is given by where b is the sheet width and h its depth (b) By...
The large mechanical tongs shown are used to grab and lift a thick 1800-lb steel slab HJ. Knowing that slipping does not occur between the tong grips and the slab at H and J, determine the components...
Viscosity of suspensions, data of V and 3 for suspensions of small glass spheres in aqueous glycerol solutions of ZnI 2 can be represented up to about ? = 0.5 by the semi empirical expression Compare...
Assume you have the following jobs to execute with one processor, with the jobs arriving in the order listed here: a. Suppose a system uses FCFS scheduling. Create a Gantt chart illustrating the...
Conditions at the bottom tray of a reboiled stripper are as shown in Figure. If valve trays are used with a 24-in. tray spacing, estimate the required column diameter for operation at 80% offlooding....
Several linear transmitters have been installed and calibrated as follows: (a) Develop an expression for the output of each transmitter as a function of its input. Be sure to include appropriate...
When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO2 (carbon dioxide), which is the principal gas causing the greenhouse effect and thus global climate...
A piece of machinery of weight W is temporarily supported by cables AB, AC, and ADE. Cable ADE is attached to the ring at A, passes over the pulley at D and back through the ring, and is attached to...
A flue passing hot exhaust gases has a square cross section, 300 mm to a side. The walls are constructed of refractory brick 150 mm thick with a thermal conductivity of 0.85 W/m K. Calculate the...
A double-wall heat exchanger is used to transfer heat between liquids flowing through semicircular copper tubes. Each tube has a wall thickness of t = 3 mm and an inner radius of r; = 20 mm. and good...
Flow of a polyisoprene solution in a pipe, a 13.5% (by weight) solution of polyisoprene in isopentane has the following power law parameters at 323 K: n = 0.2 and m = 5 x 10 3 Pa s n . It is being...
Most of the concrete used in the construction of buildings, roads, dams, and bridges is made from port land cement, a substance obtained by pulverizing the hard, granular residue (clinker) from the...
A certain OS supports four different address spaces for each process, called Sa, Sb, Sc, and Sd. Suppose the memory manager loads the four address spaces into physical memory as shown: What is the...
Gaseous hydrogen at 150 psia and 80F is stored in a small, spherical, steel pressure vessel having an inside diameter of 4 in. and a wall thickness of 0.125 in. At these conditions, the solubility of...
What is the volume of 0.662 mol of He if the density of He is 0.1785 g/L?
Given that a current sheet with surface current density Js = x8 (A/m) exists at y = 0, the interface between two magnetic media, and H1 = z11 (A/m) in medium 1 (y > 0), determine H2 in medium 2(y <...
The elbow joint is flexed using the biceps brachii muscle, which remains essentially vertical as the arm moves in the vertical plane. If this muscle is located a distance a from the pivot point A on...
Consider nodal configuration 2 of Table 4.2. Derive the finite-difference equations under steady-state conditions for the following situations. (a) The horizontal boundary of the internal comer is...
In Problem 3.25, determine the perpendicular distance from point A to a line drawn through points C and G. Problem 3.25: The ramp ABCD is supported by cables at corners C and D. The tension in each...
An 8-kg plunger is released from rest in the position shown and is stopped by two nested springs; the constant of the outer spring is k1 = 3 kN/m and the constant of the inner spring is k2 = 10 kN/m....
Determine the angle ? between the sides of the triangular plate. 3 m Sm
Find the power absorbed by the 10-K ohms resistor in the circuit shown. 11 mA 10 k 2000
Consider a steam power plant operating on the ideal Rankine cycle with reheat between the pressure limits of 25 MPa and 10 kPa with a maximum cycle temperature of 600C and a moisture content of 8...