Mechanical Engineering Questions and Answers April 30, 2020

The air in a room at T0 = 300 K and P0 = 100 kPa is drawn steadily by a vacuum pump through a 1.4-cm-diameter, 35-cm-long adiabatic tube equipped with a converging nozzle at the inlet. The flow in the nozzle section can be approximated as isentropic, and the average friction factor for the duct can be taken to be 0.018. Determine the maximum mass

Po 100 kPa T, 300 K D 1.4 cm Vacuum pump L 35 cm

Another possibility is the function f (n) = an^b, where a and b are again constants to be determined. Using the same data as in Example 7.5 and RMSE as the fitting criterion, find the best fit to this type of function. In terms of RMSE, which function appears to fit the data better, the one here or the one in the example? Can you spot any

The 4.5-ft concrete post is reinforced with six steel bars, each with a 11 8-in. diameter. Knowing that Es 5 29 3 106 psi and Ec 5 4.2 3 106 psi, determine the normal stresses in the steel and in the concrete when a 350-kip axial centric force P is applied to the postn

P 18 in. 4.5 ft Fig. P2.35

The following system has three particles A, B, and C. The following information is given ma 3kg, mg 4kg, and m, 5kg VA 4i 4j 6k, vg vzi v,j 4k, and ve 2i 6j 4k Determine the following (a) The components v, and v, of the velocity of particle B for which the angular momentum Ho of the system about O is parallel to the zaxis (b) The

A 28-kg rock approaches the foot of a hill with a speed of 15m/s. This hill slopes upward at a constant angel of 40 degrees about horizontal. The coefficients of static and kinetic friction between the hill and the rock are 0.75 and 0.20, respectively. (a) Use energy conservation to find the maximum height above the foot of the hill reached by the

A hold tank is installed in an aqueous effluenttreatment process to smooth out fluctuations in concentration of the effluent stream. The effluent feed to the tank normally contains no more than 100 ppm of acetone. The maximum allowable concentration of acetone in the effluent discharge is set at 200 ppm. The surge tank working capacity is 500m3

A 46 cm long highresistance wire with rectangular cross section 7 mm by 3 mm is connected to a 12 volt battery through an ammeter, as shown in the figure. The resistance of the wire is 59 ohms. The resistance of the ammeter and the internal resistance of the battery can be considered to be negligibly small compared to the resistance of the wire.

Consider a room with a volume, V = 2100 {rm m}^3, containing machinery that produces carbon monoxide (CO) at a rate Q(t) = 0.0042 {rm m}^3/{rm hr}. Assume that ventillation brings fresh air into the room (assume constant volume and constant pressure) where it mixes completely, then exhausts at a rate of f = 8 {rm m}^3/{rm hr}. If c(t) is the

One important issue in environmental health is being able to maintain air quality in workplaces. It has been been shown that extended exposure to carbon monoxide as low as 0.00012 can be harmful. a. Consider a room with a volume, V 1700 m, containing machinery that produces carbon monoxide (CO) at a rate Q(t) 0.004 mhr. Assume that ventillation

If U(t)=2sin3t, what is the output Y(s)?

If u(t) = delta(t),that is,the unit impulse at = 0.What is the output when t goes to infinity?

A two-phase liquidvapor mixture of H 2 O has a temperature of 300 o C and occupies a volume of 0.05 m 3 . The masses of saturated liquid and vapor present are 0.75 kg and 2.26 kg, respectively. Determine the specific volume of the mixture, in m 3 /kg.

Consider the following transfer function Y(s) G(s) 5 U(s) 10s 1 What is the steadystate gain What is the time constant If U(s) 2s, what is the final value of the output y(t) For the same U(s), what is the value of the output when t 10 What is the output when expressed as a fraction of the new steadystate value If U(s) (1e)s, that is, the unit

The indicated location of the center of gravity of the 3630-lb pickup truck is for the unladen condition. If a load whose center of gravity is x = 16 in. behind the rear axle is added to the truck, determine the load weight W L for which the normal forces under the front and rear wheels are equal.

WL B 45 67

Consider the following transfer function 3e Y (s) G (s) U (s) 10s 1 a. What is the steadystate gain b. What is the time constant c. If U(s) 4s, what is the value of the output y(t) when t 0 d. For the same input, what is the value of the output when t 10 What is the output when expressed as a fraction of the new steady state value e. If U(s)

the cost to manufacture each unit of a specific product (marginal cost) is $30. The fixed cost related to the product are $8,000 per month. This product sells for 50.

na 4R four bar mechanism shown link lengths 02A 80 mm, AB 300mm, O4B 120 mm, and 02 04 350 mm. The angle 0 37. The crank AB rotates uniformly at w2 61 rads. Location of all the instantaneous centers were given with the dimensions of I1224 131.6 mm, I1323 373 mm, I23124 2368 mm and l13134 366 mm. Find the angular velocity of the link BC.

For the mechanism shown using analytical method of analysis (vector loop), knowing that link length O2A 40 mm, AB 60 mm w2 23.75 rads and 02 55. Determine the displacement and velocity of the slider point B A B 02 O O A. Displacement of B 66.51 mm O B. Velocity of B 1707.21mms O C. Displacement of B 73.21 mm O D. Velocity of B 1221.58 mms O

When designing a Cam follower mechanism, the best and gives the smoother motion of the follower from the following is A. Uniform Motion O B. Simple Harmonic Motion O C. Cycloidal Motion O D. Parabolic Motion

A rectangular channel with width B1 m has a smooth and gradual contraction B2 m in the direction of flow. Downstream of the contraction, the channel width remains constant B3 m with identical width as in the contraction B2 m. The channel width B1 is provided in your data set, but the widths B2 B3 are unknown. The constant flow rate Q 1s is also

The 'Real life' In 'Managing quality' outlines techniques used to manage costs and quality at the Flinders Medical Centre. Explain how spare capacity might arise as a result of reducing waiting times and Improving patient throughput and how that capacity can be managed to reduce costs.

A home is in a hot locale with an annual cooling load of 39.6 million BTU (that is, it has to remove that much heat from the home.) The ACs distribution system efficiency is 95%. If its cooling system has a locally adjusted SEER of 13 and electricity costs $0.15/kWh, how much money will they spend per year on cooling?

Determine a general expression for the normal force NA exerted by the smooth vertical wall on the uniform slender bar of mass m and length L. The mass of the cylinder is m1, and all bearings are ideal. Determine the value of m1 which makes (a) NA = 0.76 mg and (b) NA = 0.

C m B. E 21 13

For the tension load N* = 300 kN shown in the figure below, according to AS4100: a) Design an equal angle member b) Design an unequal angle member connected through the larger leg.

N 300 Single line of 16 mm diameter bolts (18 mm diameter holes)

If the motor draws in the cable at a rate of v=(0.05t^2)m/s, where t is in seconds, determine the tension developed in the cable when t=2.5 s. the crate has a mass of 25 kg and the coefficient of kinetic friction between the crate and ground is .2.

A rigid tank has a volume of 0.01 m 3 . It initially contains saturated water at a temperature of 200 o C and a quality of 0.4. The top of the tank contains a pressure regulating valve which maintains the vapor at constant pressure. This system undergoes a process where it is heated until all the liquid vaporizes. How much heat in (kJ) is

valve maintains pressure in system constant T1 200 oC x1 0.4 V 0.01 ma

Locate the centroid (x, y) of the beams crosssectional area as shown in Figure 10, and then determine the second moment of area with respect to the centroidal x and yaxes. y 10 mm 100 mm 10 mm 300 mm 10 mm 200 mm Figure 10

In a Hooke's joint, the angle between the two shafts is 15. Find the angles turned by the driving shaft when the velocity of the driven shaft is maximum, minimum and equal to that of the driving shaft. Also, determine when the driven shaft will have the maximum acceleration and retardation. (Max. vel. at o and 180; min. at 90 and 270; equal to

wie K ,Consider a linear array of N identical simple pendula of mass m and length I that are sus pended from equal height points, evenly spaced a distance a apart. Suppose that each pendu lum bob is attached to its two immediate neighbors by means of light springs of unstretched length a and spring constant K. The following figure shows a small

A 50% reaction multistage axial-flow gas turbine has a stagnation enthalpy drop of 288 kJ/kg. Assume repeating stages with the identical temperature drop. The nozzle exit angle is 70. The inlet angle to the rotating blade row is inclined at 20 with the axial direction. The axial velocity is constant through the stage. Take Cp = 1.147 kJ/kg C and

are office rent ($ 8 comma 100), depreciation on office furniture left parenthesis $ 1 comma 700 right parenthesis, utilities ($ 2 comma 000), special telephone lines ($ 1 comma 500), a connection with an online brokerage service ($ 2 comma 500), and the salary of a financial planner ($ 5 comma 200). Variable costs include payments to the

In a vacuum chamber designed for surface science experiments, the pressure of residual gas is kept as low as possible so that surfaces can be kept clean. The coverage of a surface by a single monolayer requires about 1019 atoms per m. What pressure would be needed to deposit less than one monolayer per hour from residual gas You may assume that if

A 132 kV, three-phase, 50Hz transmission line uses 18 mm diameter, equally spaced ACSR conductors. Determine the spacing between these conductors, if it is to be designed such that the corona inception voltage is 5% higher than the normal operating voltage of the line at 40o C. You may assume the expression relating the electric field and the

Young's double slit experiment is one of the classic tests for the wave nature of light. In an experiment using red light ( = 637 nm) the second dark fringe on either side of the central maximum is = 3.8 degrees relative to the central bright fringe. (a) write an expression for the separation distance d between the slits. (b) Numerically, what is

Suppose in Figure 11-18 that mA=mB=0.68kg, rA=rB=0.Two disks are mounted on low-friction bearings on a common shaft. The first disc has rotational 33m, and the distance between the bearings is 0.30 m.

earing mA L LLB LB FB Axle mB Bearing FIGURE 1118 In this system L and o are not parallel. This is an example of rotational imbalance.

The lifting mechanism below is driven by a chain connected at A that can exert a force P 390 lb. The rollers at A and B have frictionless bearings and ride freely along the inclined track. W Draw the freebody diagram of the Tshaped rigid body ABCD, assuming d . Use the smallest number of vectors to express your solution (remember that there is

A combustible mixture of air and fuel is ignited at the point O at time t0 by a spark, which initiates a spherical flame front moving outwards from the point O at a constant velocity Vr. The combustible mixture, which has constant density pu ahead of the flame front, is converted in the very thin flame front to products of combustion, which has a

Water with a flow rate of 0.05 kgs enters an automobile radiator at 400 K and leaves at 330 K. The water is cooled by air in cross flow which enters at 300 K at a mass flow rate of 0.75 kgs. The overall heat transfer coefficient is 200 WmK, and both sides of the heat exchanger are unmixed. Use the eNTU method to find (a) The required heat transfer

A rigid steel tank contains 7 lbm R-134a at 40 F with a specific volume of 0.4 ft3 /lbm. The whole system is now heated to a temperature of 120 F. (a) Find the volume of the tank. (b) Find the final pressure. (c) Find the work done during the process. (d) Find the process heat transfer.

1. A refrigerated room is kept at 18C by a vapor compression cycle with refrigerant. Heat is rejected to cooling water that enters the condenser at 14C at a rate of 0.35 Water 14 C 22 C R134a as the 1.2 MPa QH 1.2 MPa 50 C 5 C subcool kgs and leaves at 22C. The refrigerant enters the condenser at 1.2MPA and 50C and leaves Condenser at the same

The two homogeneous fine sticks OA and BC have a mass of 6 kg each. Rods, It was welded together at point A and formed the T shape. From that point It can rotate easily in the vertical plane by articulating. Horizontal showing OA If the rods have an angular alignment of 12 rad s as they pass through the position, the at the joint will occur R

A small block of 2.m multiples with velocity v on a horizontal surface it moves by sliding frictionlessly. Where R 1.2m As is known, the separation from the cylindrical surface of BCD by 40 What should be the magnitude of v velocity 3D C R. D ,A small block of 2.m multiples with velocity v on a horizontal surface it moves by sliding

1. In the crankconnecting rod mechanism in the figure, the OA crankshaft passes through the O point. clockwise around the axis perpendicular to the plane, woA 3000 rpm constant it freezes at angular speed. Connecting rod AB to the crankshaft at point A, and from point B It is articulated to the piston with the piston pin. For position e 90 a)

A 1.8 kg mass, m2, on a 39.9 incline is connected to a 5.3 kg mass, m1, on a horizontal surface. The surfaces and the pulley are frictionless. If F = 31.8 N, what is the magnitude of the tension in the connecting cord?

The tapered stiffened beam below is loaded by forces as shown. The beam is assumed to consist of stiffeners carrying only direct stress and shear panels carrying only shear stress. The material used has E = 10500 ksi, G = 3900 ksi, (sigma)ty = 48 ksi,(sigma)cy = 38 ksi, (sigma)sy = 37 ksi. (a) Calculate the stiffener axial loads (lbf) at the end

S1 12.8 kip S2 5.3 kip S3 2.8 kip 5.94 2.45 S S3 A F 6.0 B G 5.0 S K C E H 1.96 dimensions in inches 4.95 y X

b) A cylindrical tank contains water at a height of 55 mm as shown in Figure 1. Inside is a smaller pen cylindrical tank containing cleaning fluid at height, h. If P3 is 13.40 kPa gage and Pc is 13.42 kPa gage, calculate gage pressure Pa and height, h of cleaning fluid. Given specific gravity of cleaning fluid is 0.8. Assume that the cleaning

Below are freebody diagrams for three electric charges that lie in the same plane. Their relative positions are unknown. There are two forces shown on each charge. These two forces represent the force exerted on the charge by each of the other two charges. Part A Along which of the lines (A to H) in (Figure 1) should charge 2 be placed so that the

Derive the continuity equation from first principles using an infinitesimal control volume of rectangular shape and having dimensions (dx, dy, dz). Identify the net mass flow rate through each surface of this element as well as the rate at which the mass of the element is increasing. The resulting equation should be expressed in terms of Cartesian

HERE IS HOW THE TXT FILE LOOKS LIKE (it is screen shot since I cannot upload txt file)

7. Inventory Class Design an Inventory class that can hold information for an item in a retail stores inventory. The class should have the following private member variables. Variable Name Description itemNumber An int that holds the items number. quantity An int that holds the quantity of the item on hand. cost A double that holds the wholesale

A frog makes four jumps in a row. The displacement vectors for the four jumps are: (1) 25.5 cm, due west (2) 24.0 cm, 32.0 south of west (3) 25.0 cm,32.0 south of east (4) 34.5 cm, 34.0 north of east. What is the magnitude and direction of the frog's displacement from its starting point? Express the direction as an angle measured counterclockwise

A fluid of density and viscosity flows through a section of horizontal converging-diverging duct. The duct cross-sectional areas Ainlet, Athroat, and Aoutlet are known at the inlet, throat (minimum area), and outlet, respectively. Average pressure Poutlet is measured at the outlet, and average velocity Vinlet is measured at the inlet. (a)

The utility loader bucket mechanism shown is raising earth and rocks. The bucket weighs 280 lb and the earth and rocks weigh 1600 lb. The mass center of the bucket and these contents is at point E. Neglect the weight of members AB, JH, and DBP. Find the force in the hydraulic arm, JH, and find the reactions at the pin P onto the bucket. y 40 in 12

A ball is dropped with a velocity v, at an angle a with the vertical onto the top step of a flight of stairs consisting of 8 steps. The ball rebounds and bounces down the steps as shown. Each time the ball bounces, at points A, B, C, ..., the horizontal component of its velocity remains constant and the magnitude of the vertical component of its

Lowcarbon steel is being replaced by HSLA steels in automobiles to save weight because the higher strengths of HSLA steels permit use of thinner gauges. In laboratory tests at a strain rate of about 103s, one grade of HSLA steel has a yield strength of 420 MPa with a strainrate exponent of m 0.005 while for the lowcarbon steel, Y 240 MPa and m

Q5. The following readings are obtained from an equiangular strain gage rosette mounted on a free and unloaded surface of a part a0 2000, e120 1000, and e240 1000. Gage orientation angles are measured counterclockwise, and strain values are in micrometers per meter. Determine the magnitude of the principal strains and their orientation with

Q1. Figure shows a hand crank with static vertical load applied to the handle. (a) Copy the drawing and mark on it the location of highest bending stress. (b) Mark on the drawing the location of highest combined torsional and transverse shear stress. (c) Calculate the maximum normal and shearing stresses at point A. (d) Estimate the safety factor

Q4. A steel cantilever beam is of circular crosssection is subjected to a transverse load at its free end which varies from 45 N up to 135 N down. The strength properties are as follows Ultimate strength 600 MPa, Yield strength 360 MPa, Endurance limit 300 MPa. The theoretical stress for 45 N 324 mm concentration factor bending is 1.5 and the

Q2. Figure shows a vertically loaded bracket attached to a fixed member by three identical bolts. Although the 20kN load is normally applied in the center, the bolts are to be selected on the basis that the load eccentricity shown could occur. Because of safety considerations, SAE class 9.8 steel bolts and a minimum safety factor of 5 (based on

Q3. The bracket shown in figure supports a 48 kN load. The fillet weld extends for the full 120 mm length on both sides. What weld size is required to give a safety factor of 4 if E60 series welding rod with yield strength of 400 MPa is used 120 mm 48 kN 6 mm

The divorce decree specifies that in the case of an increase ordered by the court in the maintenance of the children, the amount of the alimony payment will decrease according to the amount of the increase in child support That is, the total monthly payment of Tatsuo can not exceed $ 2,800

Kararl durumda hava bir kompresre 100 kPa basn 27C scaklk ve 30 mdk debisinde girmekte 230 kPa basn ve 127C scaklnda kmaktadr (ekil). Hava daha sonra bir is deitiricisine girmekte sabit basnta 77C scaklnda kmaktadr. s deitiricisinin dier tarafnda su dolamaktadr. Is deitiricisine suyun giri scakl 20C k scakl 40Cdir. evreyle herhangi bir is

At the inlet of a steam turbine, the pressure and the temperature of the steam are P1 1 MPa and T 300 C respectively, its outlet pressure and quality are P2 7.5 kPa, x2 0.9, respectively. Assuming that the environmental temperature is To 20 C and the ambient pressure is Po 100 kPa, and the changes in kinetic and potential energies are

"Six pendulums of mass m and length k as shown are released from rest at the same angle from vertical. Rank the pendulums according to the number of complete cycles of motion each pendulum goes through per min Rank from most to least complete cycles of motion per minute. To rank items as equivalent, overlap them. a) L=2m, m=4kg b) L=2m m=2kg c)

A hydroelectric facility extracts power from a reservoir at an elevation of 800 m discharging into a tailrace at an elevation of 200 m. A penstock 1500 m long and 0.8 m in diameter connects the reservoir to the tailrace. Minor losses are K 3 and C 1500. Determine the power extracted by the turbine if the flow rate is 2 ms.

S3.2 Baby Doll Shop currently manufactures wooden parts for dollhouses. Its sole worker is paid 8.10 an hour and, using a handsaw, can produce a years required production (1,600 parts) in just eight weeks of 40 hours per week. That is, the worker averages five parts per hour when working by hand. The shop is considering the purchase of a power

Gasoline is supplied to a 2.6 liter, fourcylinder sparkignition engine at 2.5 gs. If the engine is operating at 2500 rpm determine the following a. The airflow rate for stoichiometric combustion b. The mass of fuel and air entering each cylinder per cycle c. The volumetric efficiency

3.7 A fourcylinder fourstroke 2.8 L port injected spark ignition engine is running at 2000 rpm on a lean (p 0.9) mixture of octane and standard air (101 kPa, 298 K). If the octane flow rate is 2.5 gs, what is the mass of fuel entering each cylinder per cycle and the volumetric efficiency Species CO, H,0 N2 0.125 0.141 0.734

A rigid tank A is connected to a spherical elastic balloon B as shown in the figure below. Both contain air at the ambient temperature of 25 C. The volume of tank A is 0.05 m and the initial pressure is 250 kPa. The initial diameter of the balloon is 0.3 m and the pressure inside is 110 kPa. The valve connecting A and B is now opened and remains

Consider the following reaction at equilibrium: 2KClO3(s) 2KCl(s) + 3O2(g) n Predict whether the reaction will shift left, shift right, or remain unchanged if O2 is removed from the reaction mixture. Predict whether the reaction will shift left, shift right, or remain unchanged if KCl is added to the reaction mixture. Predict whether the reaction

Consider a bridge (Figure 1), where all horizontal and vertical members have a fixed length a, with a vertical load P at each of the joints in the support along the deck as shown below (Figure 2). This load P corresponds to the load from the deck. For everything ahead, we will simplify the problem by considering it in 2D. Figure 2 (not to scale)

Fluid originally flows through a tube at a rate of 100 cm 3 /s . To illustrate the sensitivity of flow rate to various factors, calculate the new flow rate for the following changes with all other factors remaining the same as in the original conditions. (a) Pressure difference increases by a factor of 1.50. (b) A new fluid with 3.00 times greater

The system is released from the rest in the position shown. The 15kg cylinder falls through the hole in the support, but the 15kg collar (shown in section view) is removed from the cylinder as it hits the support. Determine the distance s which the 50kg block moves up the incline. The coefficient of kinetic friction between the block and the

A group of particles of a total mass of 48 kg has a total kinetic energy of 385 J. The kinetic energy relative to the center of mass is 83 J. What is the speed of the center of mass?

A bale of hay sits on the bed of a trailer. the trailer is starting to accelerate forward, and the bale is slipping toward the back of the trailer. a) draw a motion diagram. b) draw a force identification diagram. c) draw a free body diagram.

A race car track has been constructed with the a bank angle of 33.1 so there is no friction force. The race car track has a curve radius of 362. m. What speeds, for the race cars, has the track been designed to accommodate?

a) Determine the degreeoffreedom of mechanism b) Write the closure loop equation(s) and define the position variables c) Perform a complete position analysis for posture shown in figure d) Write the velocity equations e) For mz72 rads (ccw), perform a complete velocity analysis (you must find all linear and angular velocities in the mechanism)

a) Write the constraints (position variables) and closure loop equation(s) b) Write velocity equations c) Write acceleration equations d) For 0,15, m 10 rads (ccw) and a,8 rads (cw), perform a complete kinematic analysis with complexalgebraic solution method AB250 mm O2A150 mm 020475 mm BO4250 mm CB100 mm AC300 mm Ca 4 02 15 02

a) Write the constraints (position variables) and closure loop equation(s) b) Write velocity equations of the mechanism c) Draw the velocity polygon and find angular velocities of the link2, link4 and link5, and linear velocities of all slider links (link3 and link6) d) Write the acceleration equations e) For a25 rads (ccw), draw the acceleration

An inverted piston-cylinder assembly fitted with a paddle-wheel contains air, initially at 20 lbf/in2, 100F, and a volume of 0.33 ft3. Energy in the amount of 1.5 Btu is transferred to the air by the paddlewheel. The piston is free to move without friction, and heat transfer with the surroundings can be ignored. Assuming an ideal gas model,

Consider a 20-cm-thick large concrete plane wall (k = 0.77 W/m K) subjected to convection on both sides with T1 = 22C and h1 = 8 W/m2 K on the inside, and T2 = 8C and h2 = 12 W/m2 K on the outside. Assuming constant thermal conductivity with no heat generation and negligible radiation. (a) express the differential equations and the boundary

A mad scientist wants to design a mechanical spring that has the ability to launch a 2 metric ton payload into deep space. Assuming that the spring's maximum compression is 150 m, what would its stiffness have to be to successfully launch such a payload? [Note that the mass of the Earth is about 61024 kg and its radius is about 6.4106 meters.]

Air is compressed from an initial condition of 1 bar and 25C to a final state of 5 bar and 25C by three different mechanically reversible processes in a closed system: ? (a) Heating at constant volume followed by cooling at constant pressure. ? (b) Isothermal compression. ? (c)Adiabatic compression followed by cooling at constant ?volume. ? Assume

The 0.02kg particle moves along the dashed trajectory shown and has indicated velocities at positions A and B. Calculate the time average of the moment about O of the resultant force P acting on the particle during the 0.5 second required for it to go from A and . 30 A4 ms 0.02 kg 60 6 ms TA 90 mm 180 mm 30 30

A rigid tank initially contains air at 60 bar. A valve is opened and the pressure in the tank falls rapidly to 35 bar. To calculate the air temperature at the final state, it is convenient to choose air remaining in the tank when the pressure reaches 35 bar as the system. a). Is this an open or a closed system? b). Is it plausible to assume that

Water flows through a pipe that gradually descends from a height of 6.78 m to the ground. Near the top, the cross-sectional area is 0.4 m 2 , and the pipe gradually widens so that its area near the ground is 0.8 m 2 . Water leaves the pipe at a speed of 16.8 m/s. What is the difference in the water pressure between the top and bottom of the pipe?

A manufacture in Ontario has been fined because it has been releasing 5 L/s effluents having a zinc concentration of 0.1 mg/L into a river. Upstream of the factory, the stream water rate is 100 L/s with a zinc concentration of approximately zero. The factory has been forced to reduce the zinc concentration of the effluent to below 20 g/L. The

A box of mass m is sliding along a horizontal surface. A. The box leaves position x=0 with speed v0. The box is slowed by a constant frictional force until it comes to rest at position x=x1. Find the magnitude of the average frictional force that acts on the box. (Since you don't know the coefficient of friction, don't include it in your

Problem 12 (20 points) A beam is held in equilibrium by a pin at A and a cable BDE that wraps over a frictionless pulley at D, which has a radius of 0.1 m. The beam supports a vertical force of P 8 kN, as shown below. Neglect the weights of the beam and pulley in this analysis. B Calculate the internal force(s) and moment(s) at point C. D 0.1 m

Determine the amount of heat removed from the reactor per mole of CH4 fed to the reactor.

2. Methane and oxygen at 25C are fed to a continuous reactor in stoichiometric amounts according to the following reaction to produce formaldehyde CH4 (g) O2(g) HCHO(g) HO(g) In a side reaction, methane is oxidized to carbon dioxide and water CH4 (g) 202 (g) CO (g) 2HO(g) The product gases emerge at 400C, and the number of moles of CO in the

A stock has an expected return of 12%. If the risk-free return is 5%, and the market risk premium (MRP) is 8%, what is the beta of this stock? 0.50 0.88 0.25 -0.88

Four particles are placed at the vertices of a square with sides of length 0.60 m The mass of each particle is 0.4 kg The particles are connected by rods of negligible mass This rigid body can rotate in a vertical plane about a horizontal axis A (into the paper) that passes through one of the particles The body is released from rest with rod AB

C Arotation axis B