The bearings and shaft experience additional loads as a result of this increased tension. Bearings' lifespans might be shortened by excessive stress.
Explain about poly v belt?The inside of the Poly-V Belt, also known as the Ribbed Belt, is lined with longitudinal v-shaped ribs. These ribs give the pulley and the belt a bigger surface area to contact, which increases friction force. Compared to a flat belt or rubber v-belt of the same size, the belt can convey more power as a result.
The Poly-V Belt's design ensures superior protection for all reinforcing cords, resulting in a more even load distribution. The Poly-V Belt also serves as a guide for a belt tensioner or idler pulley. Less space is needed for Poly-V Belt drives, and the Belt can be stretched under higher tension.
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what is the thermal efficiency of a rankine cycle with isentropic compression and expansion for which steam leaves the boiler as saturated vapor at 6 mpa and is condensed at 50 kpa? how does this efficiency compare the theoretical carnot efficiency? hint: draw a thermodynamic sketch of the process and look online for useful steam tables.
The carbon footprint of a building is greatly decreased by a thermally efficient building shell. 30% is the thermal efficiency.
Explain about the thermal efficiency?The proportion of heat energy that is converted into work is known as a heat engine's thermal efficiency. Even the most efficient heat engines have low efficiency; typically below 50% and frequently much lower. As a result, heat engines' energy loss to the environment represents a significant waste of energy resources.
When heat enters the boiler, the water goes through a sequence of state and energy changes before producing power through the turbine. This is known as a Rankine cycle.
We first determine the enthalpies for each state.
state 1
P = 6000 kpa x = 1 quality
h1=2784kJ/Kg
s1=5.889KJ/kgK
state 2
P=50kPa where entropy 1 Equals entropy 2
h2=2041kJ/Kg
state 3
P = 50 kpa x = 0 quality
h4=h3=340.5kJ/Kg
30% efficiency
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One ounce is equal to 28.35 grams. Convert 16 ounces to grams. Round your answer to the nearest tenth.
O 1.8 grams
O 12.4 grams
O 44.4 grams
O 453.6 grams
Answer:
453.6 gm
Explanation:
28.35 g / oz * 16 oz = 453.6 gm
the following statements are all correct except group of answer choices the pcm controls vacuum applied to vacuum operated egr valves. some systems monitor egr operation by using a map sensor. a potentiometer is used to determine egr valve position on many obd-ii systems. low restriction exhaust systems will have no effect on egr system operation.
All correct except "Some systems monitor EGR operation by using a MAP sensor ".
What controls the vacuum to the EGR valve?The vacuum to the diaphragm is adjusted by a vacuum solenoid in vacuum driven EGR valves, which then opens and closes the EGR.Some valves additionally come with a feedback sensor to let the ECU know where the valve is.Digital EGR valves typically have a feedback sensor in addition to a solenoid or stepper motor.The PCM can monitor EGR operation via the MAP sensor (manifold absolute pressure) , EGR position sensor, EGR temperature sensor, or Fuel trim.Use the freeze frame that is connected with the fault code when the EGR check engine light illuminates to try to diagnose the circuit in these circumstances.To learn more about MAP sensor refer,
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air is compressed at 20 psi and 70 degrees f to 150 psi in a compressor. the compressor is operated such that the air temperature remains constant. calculate the change in the specific volume of air as it passes through this compressor.
dH = V dp However, I am also aware that H = CpT. The air is compressed when a force is provided by pushing the plunger in. Consequently, the air now occupies less area (as seen below).
This demonstrates a reduction in the gas's volume (although the mass of the gas remains the same). It is accurate to say that as air temperature rises, so does air volume. As the gas volume decreases, the molecules hit the walls more frequently, raising the pressure; conversely, as the volume increases, the molecules must travel farther to strike the walls, reducing the frequency with which they do so and raising the pressure.
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generation of electricity in coal-burning power plants and nuclear power plants both involve . group of answer choices generation of fly ash production of large amounts of carbon dioxide none of the above heating water to produce steam which drives a turbine high-level radioactive waste
The enormous electrical generator, which produces the electricity, is driven by the revolving turbine shaft. For power plants that utilize various fuels, such coal, gas, or oil, the idea is the same.
These sizable pools of water or cooling towers are also found in numerous other power plants, such as coal-fired power plants. This resemblance arises from the fact that coal-fired and nuclear power plants both employ the same technique to convert heat into electricity. Chemical potential energy is converted into heat energy, light energy, and sound energy when coal is burned. The only energy used in the creation of electricity is thermal energy. According to the U.S. Energy Information Administration, coal, nuclear power, and natural gas made up the majority of the country's electricity generation in 2020.
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Tech A says that the principle of thermal expansion is what pushes the piston down the cylinder on the power stroke. Tech B says that the piston is pulled down the cylinder on the intake stroke. Who is correct?
Tech A is correct because Tech A says that the principle of thermal expansion is what pushes the piston down the cylinder on the power stroke.
What motion does the compression piston make?while the intake and exhaust valves are kept closed by valve springs, the piston advances up the cylinder during the compression stroke to pressurize the fuel/air combination. A high-tension spark from the spark plug ignites the mixture of fuel and air during the power stroke.
Note that By pushing the piston downward and expanding the chamber's capacity, the heat energy generated by combustion is put to use in the chamber. Due to the fact that this is when the thermal energy is converted into motion to power the device or vehicle, it is sometimes referred to as the "power stoke."
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a distribution transformer is near a home to convert high voltage from power station to wall outlets. the wall outlets have 120 v rms. the primary to secondary turn ratio in the transformer is 200:1. find the rms power station voltage in kv.
High voltages enable the transmission of power over long distances because, as was previously mentioned, they require less current to transmit a given quantity of power, which reduces line loss.
However, large voltages provide more risks, hence transformers are used to generate lower power close to the user. The primary and secondary coils are the two coils. In typical operation, the input voltage is applied to the primary, and the secondary generates the output voltage after transformation. The primary coil's magnetic field is not only trapped by the iron core, but also strengthened by the core's magnetization. Due to the AC input voltage, the secondary receives a time-varying magnetic flux that induces an AC output voltage.
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The orbital motion of water particles due to surface waves stops at a depth_
Select one:
O a. twice the wavelength
O b. equal to wavelength
O c. one-half the wavelength
O d. one-tenth the wavelength
The orbital motion of water particles due to surface waves stops at a depth of "one-half the wavelength" (Option C).
What is the orbital motion of water particles?Deep water waves (depth, D >λ /2) and shallow water waves (D < λ /20) both exhibit particle orbital motion. However, while deep water waves have a circular orbit, shallow water waves have an elliptical orbit with the primary axis in the horizontal plane [2, 3, 4, 5].
Instead, the water particles travel in circular orbits with a radius equal to wave height. This orbital motion arises because water waves include both longitudinally (side to side) and transverse (up and down) components, resulting in a circular motion.
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Tyler is developing a robot that can be sent into war zones to ensure that any mines have been detonated before soldiers are sent into the area. The government is requiring a full scale model of this robot before it is willing to purchase one
The reason a prototype is necessary before committing to a purchase in this scenario is that the robot might be very expensive.
What is a prototype?In Engineering, a prototype can be defined as a rudimentary (early) model, release, or sample of a particular product, so as to avail the developers and manufacturers an opportunity and ability to test a concept, functionality, or process within it.
This ultimately implies that, the main purpose of the prototype of a robot is to determine and show whether or not the robot and all of its features are in tandem with the design specifications and market requirements.
In this context, we can reasonably infer and logically deduce that the government requested for a full scale model of the robot before it would purchase one because it is most likely to be very expensive.
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Complete Question:
Tyler is developing a robot that can be sent into war zones to ensure that any mines have been detonated before soldiers are sent into the area. The government is requiring a full-scale model of this robot before it is willing to purchase one.
What explains why a prototype is necessary before committing to a purchase in the following scenario?
(10 pts.) a cylindrical rod 500 mm (20.0 in.) long, having a diameter of 12.7 mm (0.50 in.), is to be subjected to a tensile load. if the rod is to experience neither plastic deformation nor an elongation of more than 1.3 mm (0.05 in.) when the applied load is 29,000 n (6500 lbf), which of the four metals or alloys listed below are possible candidates? justify your choice(s).
Only Brass and Steel are the possible candidates .
Calculation :
no plastic deformation : σ<σγ :
σ = F/Aо = 6500lbs/π(0.50in / 2)² = 6500/0.196in² = 33100 psi
Thus, at this stage, only the aluminum, brass, and steel still qualify. But, we must still satisfy the elongation restriction, with DL £ 0.05 in. under the 6500 lb. load. This must mean that a particular upper limit on the strain is required, which must mean a lower limit on the Young's modulus:
∈ = δ max / Lо = 0.05in/20in = 0.0025in
With the stress already determined, we can take stress over strain and find a desired Young's modulus, and compare this desired modulus to the actual ones available on the list:
E = σ/∈ = 33.100 psi / 0.0025 = 13.2 x 10^6 psi.
Since the strain is a maximum, the elasticity modulus, E, must be a minimum. By looking at the table, we see that of the three alloys left, only brass and steel satisfy both the criteria.
What is Young's modulus ?A solid material's tensile or compressive stiffness when a force is applied lengthwise is measured by a mechanical characteristic known as Young's modulus E, also known as the Young modulus or the modulus of elasticity in tension or compression (i.e., negative tension). It is calculated using the formula and describes the relationship between axial strain (proportional deformation) and tensile/compressive stress in the linear elastic zone of a material.Despite being named after the British scientist Thomas Young who lived in the 19th century, Leonhard Euler first proposed the idea in 1727. Giordano Riccati, an Italian physicist, conducted the first tests that utilized Young's modulus in its current form in 1782, 25 years before Young's original study. The Latin root word modus, which meaning measure, is where the word modulus comes from.Learn more about Young's modulus refer :
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an automotive air conditioner produces a 2-kw cooling effect while consuming 0.75 kw of power. what is the rate at which heat is rejected from this air conditioner?
The rejected by the air conditioner system is 2.75 kilowatts.
An air conditioner system involves a refrigeration cycle. It uses power to get heat from the cold reservoir before sending it to the hot reservoir. The model is described by the First Law of Thermodynamics:
QL+W-QH=0
Where:
QL- Heat rate from the cold reservoir, measured in kilowatts.
QH = Heat rate liberated to the hot reservoir, measured in kilowatts.
W = Power input, measured in kilowatts.
The heat rejected is now cleared:
QH=QL+W
If QL=2kW and W=0.75kW
QH=2.75kW
The rejected by the air conditioning system is 2.75 kilowatts.
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the renewable composite insulation material must have the following characteristics: an overall uniform thickness less than or equal to one inch. a consistent internal composition. environmentally friendly and/or recyclable. must be economical. dimensions must not exceed the overall of the top of the heat box apparatus.
The correct anwser is that this does not exceed the overall off the top of renewable of the heat box.
Renewable Insulation introductionThe largest amount of energy consumed within the average home is related tomaintaining adequate climate control through heating and cooling systems. Toconserve energy and decrease expenses associated with climate control, properhome insulation techniques are required. Insulation technologies relating tomaterials and application have advanced throughout the home building industry withtime. The home building industry once relied on straw and newspaper for insulatingmaterial. The industry currently utilizes technology such as fiberglass and blownexpandable foam. Insulation material advancement is driven by consumersdemanding insulation material designed for high insulation value along with positiveoccupant health and environmental impact.
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Which of the following best describes a fiscal policy tool?
a. government spending
b. financial capital markets
c. bank lending
d. household spending
The element or factor which best describes a fiscal policy tool is: a. government spending.
What is a fiscal policy?A fiscal policy is sometimes referred to as monetary policy and it can be defined as the strategic use of government revenues and expenditures, in order to influence and control macroeconomic conditions such as:
Aggregate demand (AD)Money supplyEmployment within a country.InflationThe types of fiscal policy.Generally speaking, there are two (2) main types of fiscal (monetary) policy that are typically used across the world and these include the following:
Expansionary fiscal policy.Contractionary fiscal policy.In conclusion, we can reasonably infer and logically deduce that government spending is an element which is used as a fiscal policy tool to influence and control macroeconomic conditions.
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Answer:
A) government spending is the correct answer
Explanation:
(econ 1101)
an office space is 75 ft wide by 100 ft long and 10 ft high. the indoor conditions are 75 f and 24% rh, and the outside conditions are of and saturated (100% rh). the space is designed for 50 people. the infiltration rate estimated to be 0.75 ach. calculate the sensible heat loss due to ventilation and infiltration.
The correct answer is 75ftwide by100 ft long and 10ft high the sensible heat loss due to ventilation and infiltration.
Air movement inside a structure and air exchange with the outside, whether planned or unintentional, are referred to as ventilation and infiltration, respectively. They are both crucial factors to take into account when designing healthy buildings that also reduce heat loss. Infiltration is the unintended or accidental entry of outside air into a structure, most commonly through openings in the building's exterior and doors used as passageways. Air leakage is another name for infiltration. Exfiltration is the planned or unintentional loss of interior room air from a structure. A mechanical ventilation system moves air in and out using one or more electrical blowers and occasionally a ducting system.
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in general, which point has the highest convection heat transfer coefficient? laminar boundary layer transition region turbulen boundary layer
The turbulent boundary layer has the highest convection heat transfer coefficient.
Higher convection coefficients inferred lower pavement temperatures and near-surface air temperatures. It is caused by more heat energy is delivered to the ambient atmosphere along convection as air moves over the hot pavement. A turbulent layer is thicker than a laminar flow layer and it cause more skin-friction drag. Whereas the pace rise evenly in a laminar flow layer, friction affects the airflow more in the lower region of a turbulent flow layer. Most of the airflow's pace reduction happen right above the surface. The turbulent boundary layer means considered include of several regions categorized by their water velocity profile.
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assign is teenager with true if kidage is 13 to 19 inclusive. otherwise, assign is teenager with false.
We use C programming to assign is teenager with true if kidage is 13 to 19 inclusive.
What is C programming?
With a static type system and support for structured programming, lexical variable scope, and recursion, C is an imperative procedural language. It was intended to be compiled, with minimal runtime support, to offer low-level memory access and language constructs that efficiently map to machine instructions.
Code for the given problem:
#include<stdio.h>
#include<stdbool.h>
int main(void){
bool isTeenager;
int kidAge;
scanf("%d",&kidAge);
//Below line initializes the isTeenager variable to //it's corresponding value using ternary operator.
isTeenager = (kidAge>=13 && kidAge<=19) ? true : false;
if(isTeenager){
printf("Teen\n");
}
else{
printf("Not teen\n");
} }
Output:
18
Teen
27
Not teen
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consider a cylindrical titanium wire 3.0 mm (0.12 in.) in diameter and long. assuming that the deformation is totally elastic, its elongation (in mm or m) when is under a load of 500 n is:
The elongation is: 6.87 * 10⁻⁶ m
Complete Question:
Consider a cylindrical titanium wire 3.0 mm (0.12 in.) in diameter and 2.5 Ã 104 mm (1000 in.) long. Assuming that the deformation is totally elastic, its elongation (in mm or m) when is under a load of 500 n is:
Diameter of the titanium wire = d = 0.12 in = 3.0 mm = 0.003 m
Length, L = 1000in = 104 mm = 0.0104 m
Load/Force applied = F = 500 N
Elongation is change in length ΔL
Stress on the wire = Force/Area
F = 500 N
A = π (d/2) ² = π (0.003/2) ²
A = 7.069*10⁻⁶ m²
Stress = 500 N/7.069x10⁻⁶ m² = 70.731x10⁶ N/m2
Stress = 0.0707 GPa
Now, the Young's modulus for Ti = 107 GPa
Young's modulus = Stress/Strain
Strain = 0.0707/107
Strain = 0.000660
Now,
Strain = ΔL/L
ΔL = 0.000660x0.0104
ΔL = 6.87 * 10⁻⁶ m
Hence the elongation is 6.87 * 10⁻⁶ m
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A brass rod 1.5 m long and 20mm diameter was found to deform by 1.9mm under tensile load of 40KN. Calculate the modulus of elasticity.
Which of these parts serves as the front-end cross structure on most vehicles?
A. Front lower rail
B. Radiator core support
C. Front upper rail
D. Apron
'Radiator core support' part serves as the front-end cross structure on most vehicles. Hence, option B 'radiator core support' is the correct answer.
What is the 'Front-End Cross Structure' of Vehicles?
The front-end cross structure of automobiles is referred to the several frontal parts that are located at the front of vehicles and that define their appearance and their effective workability and running. The radiator core support is one of the front-end cross structures that acts as extra protection for the radiator of vehicles by holding it securely in place and to the engine. If any part of the front support of the radiator core is damaged, it might interfere with the cooling system, that in turn can lead to a host of other expensive issues that are best avoided at all costs.
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Make sure the file GuessNumber. Py is selected and open. Write loops that validate input at all places in the code where the user is asked to provide input. Comments have been included in the code to help you identify where these loops should be written. Execute the program. See if you can guess the randomly generated number. Execute the program several times to see if the random number changes. Also, test the program to verify that incorrect input is handled correctly. On your best attempt, how many guesses did you have to take to guess the correct number
To check the input, use an if/else or a try/except statement. Use a continue statement to move on to the next iteration if the input is invalid. Use a break statement to exit the loop if the input is correct.
The flag variable will initially be set to false and if we can determine that the input data is what we are expecting, the flag status can be set to true and we can determine what can be done next based on that. The validation can be done in two different ways, namely by using a flag variable or by using try or except. For specific data types, validation should strive to be as tolerant of various forms of input as possible.
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What is the overall meaning of the “Engineering V?
Answer:
Engineer V provides expert consultation in one or more areas for the design, development and implementation of technical products and systems. Resolves highly complex technical issues and conducts advanced research. Being an Engineer V recommends alterations to development and design to improve quality of products and/or procedures.
Explanation:
a venturi meter with a 7 in diameter throat is installed in a 14 in diameter water line. the venturi is perfectly smooth, so that the discharge coefficient is 1.00. an attached mercury manometer registers a 3 in differential. what is the volumetric flow rate?
Micrometer for brake rotors. For air disc brakes, the steering axle brake lining/pad thickness must be at least 3.2 mm (1/8 inch), and for hydraulic disc, drum, and electric brakes, it must be at least 1.6 mm (1/16 inch).
Every 45° (1/8 of a rotation), take a measurement of the brake rotor thickness of 0.40 inches (10mm) inside the outside circumference of the brake rotor. 6. Compare the lowest result obtained to the brake rotor's minimum thickness requirements. Depending on the vehicle, replacement brake pads can range in thickness from roughly 3/8" to 1/2". When the pads are down to around 1/4 inch, some shops advise changing them; others advise doing so at 1/8 or when only 20 to 25 percent of the original thickness remains.
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What is the definition of a rural area according to china and Europe?
An undeveloped country learns what from developed countries with regards to rural settlement and how do developers countries develop their areas? Which legislations can be implemented to achieve rural settlement planning?
The definition of a rural area according to China and Europe is: one in which more than half of the population resides in rural grid cells, as measured by the degree of urbanization.
What is a rural area?A rural area, sometimes known as the countryside, is a geographical area located outside of towns and cities.
Rural areas often have a low population density and tiny communities. Agricultural and forestry regions are sometimes referred to as rural.
Cities, suburbs, and towns are all examples of urban environments. Villages are sometimes referred to as rural places.
Cities have seen increased growth in terms of infrastructure and connectivity, such as airports, ports, railroads, housing, and roadways. Infrastructure development in rural regions is typically limited.
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you are on a job site and observe wall forms that are constructed of light, rigid foam insulation. a coworker explains that the wall forms will remain as part of the wall system after the concrete is poured and cured. what is the name commonly used for this type of wall?
kalpakjian and schmid, problem 5.70. a 75-mm thick square plate and a right circular cylinder with a radius of 100 mm and height of 50 mm each have the same volume. if each is to be cast using a cylindrical riser, will each part require the same size riser to ensure proper feeding? explain.
Here, it is evident that a square plate requires more time than a cylinder. Therefore, a larger riser will be needed, and there will be a range of sizes for the riser.
We are aware that the time required for solidification equals C(volume/area), where C is a constant.
volume of cylinder = r2h where r = 100mm = 0.1 m and h = 50mm = 0.05 m
Cylinder volume = (0.1)
²×0.05 =0.00157m³
the cylinder's total surface area is equal to 2r² + 2rl (0.1)
Time taken for the cylinder = C(Volume/Area) = C(0.00157/0.0942) = (2.78 10⁻⁴)C since 2 + 2(0.1)(0.05) = 0.0942 m2.
For a square plate, h = 75 mm = 0.075m, l = b = x, and x = 0.144m. Accordingly, l = b = 0.144m, and the volume of the square plate is equal to 0.0157 m³ [A/C to inquiry].
Total surface area is equal to 2 (lb + bh + hl) (0.144)
Time taken for a square plate equals C(volume/area) = C(0.00157/0.0847) = (3.43 10⁻⁴)C because 2 + 4 (0.144) (0.075) = 0.0847 m³
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is it possible to create something that no one else has created before the near future
Answer:yes
Explanation:
That's what other people done they've created something no one else thought of.
A series rlc circuit consists of a 231 ω resistor, a 14. 3 mh inductor, a 9. 71 μf capacitor, and an ac source of amplitude 39 v and variable frequency. The voltage source frequency is set to 6. 1 times the resonance frequency. Find the impedance of this circuit.
The value of impedance is 230,1 ohm.
The opposition to alternating current performed by the combined effect of resistance and reactance in a circuit is known as impedance. To determine the impedance, we can use this formula:
Z = [tex]\sqrt{R^{2} + (XL -XC)^{2} }[/tex]
From the scenario we know that
ω = 231
L = 14.3 Mh
C = 9.71 μf = 9.71 x 10⁻⁶
V = 39 V
F = 6.1
Firstly we calculate the amount of XL using this formula
XL = 2πfL
XL =2 x 3.14 x 6.1 x 14.3
XL = 0.55 Ω
Then, we also determine the value of Xc
Xc = 1/2πfC
Xc = 1/(2 x 3.14 x 6.1 x 9.71)
Xc = 1/ 371.97 = 0.0026 Ω
After that substitue all the value into the formula to find the impedance
Z = [tex]\sqrt{R^{2} + (XL -XC)^{2} }[/tex]
Z = [tex]\sqrt{231^{2}+(0.55-0.0026)^{2} }[/tex]
Z = [tex]\sqrt{53,361-0.300}[/tex]
Z = [tex]\sqrt{53,360}[/tex]
Z = 230,1
So, the value of impedandance is 230,1 ohm.
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Two Liquids, A and B, are mixed. A is 5% solids, the rest is water. B is 11% solids; the rest is water. To the mixture is added 18.5 kg of bone-dry solids resulting in a mixture of 2,150 Kg containing 8.25% solids. What were the original amounts of the liquids A and B? Show all work
The original amounts of the liquids A and B based on the information will be 1260kg and 872kg.
What is an equation?An equation is the statement that illustrates that the variables given. In this case, two or more components are taken into consideration to describe the scenario. It is vital to note that an equation is a mathematical statement which is made up of two expressions that are connected by an equal sign.
Based on the information given, let us call the liquids illustrated as A and B, while the weight is in kg.
The first equation is the amount of solids and this will be represented thus:
0.05A + 0.11B + 18.5 = 0.0825(2150) = 177.375
0.05A + 0.11B = 158.875
5A + 11B = 15887.5
The second equation will be represented thus:
A + B + 18.5 = 2150
Collect like terms
A + B = 2150 - 18.5
A + B = 2131.5
Multiplying the equation will be:
6B = 5230
Divide through by 6
6B / 6 = 5230 / 6
B = 872 kg
Therefore, A will be 1260 kg.
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a battery high rate discharge (load capacity) test is being performed on a 12 volt battery. technician a says that a good battery should have a voltage reading of higher than 9.6 volts while under load at the end of the 15-second test. technician b says that a battery conductance tester is often used to load the battery to two times the cca rating of the battery. who is right?
Technician A is correct.
What is CCA rating ?The battery industry uses the CCA rating to describe a battery's capacity to start an engine in cold weather. A 12-volt battery's rating is the maximum amount of amps it can produce for 30 seconds at 0°F while maintaining a voltage of at least 7.2 volts.
What is Load capacity ?The highest force that may be delivered to a stage in a given direction while still satisfying stage requirements is known as the load capacity. This maximal force is made up of both static (gravity times mass) and dynamic (mass times acceleration) forces. Any outside forces operating on the stage, such vibrations, must be considered dynamic forces. The maximum accelerating force that a stage can produce without going over its load capacity determines how much acceleration it can give a mass.Learn more about Rated load capacity refer :
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STINGY SAT is the following problem: given a set of clauses (each a disjunction of literals) and an integer k, find a satisfying assignment in which at most k variables are true, if such an assignment exists. Prove that STINGY SAT is NP-complete
In B, there can be no boundaries separating different pieces. Assume there was a contradiction.
Because it passes between two vertices that were left unaffected by the maximum matching edges, the edge may have been added to expand the size of the maximum matching. This goes against our presumption that the matching was the best possible match, hence edges between different parts of B are not viable. All of the graph's edges must therefore either be part of the maximum matching or be - between a vertex in B and one that is the terminal of a maximum matching edge. Choose a vertex in B specifically if one of the endpoints has an edge to it. It doesn't matter which one you choose if not.
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