With a pressure drop of 120 kpa/m, glycerin at 380 c flows through a horizontal pipe with a 9 mm diameter. The Reynolds number is 3.807 after the discharge.
pressure drop=32μVL/D²
120*10³=32*0.95*V*1/(9*10⁻³)²
Velocity V=0.329 m/sec
discharge =AV
=π(9*10⁻³)²/4*0.319
pressure drop=2.02*10⁻⁵ m³
then,
Reynolds number=VD/γ
=δVD/μ
1.26*10³*0.319*9*10⁻³/0.95
=3.807
By measuring the proportion of inertial and viscous forces, the Reynolds number aids in the prediction of flow patterns in various fluid flow scenarios. Laminar flow typically predominates in low Reynolds numbers flows while turbulent flow predominates in high Reynolds numbers flows.
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Design the dimensions of an air-filled waveguide to be used for transmission of electromagnetic power at 10 GHz. This frequency should be at the middle of the operating frequency band. The design should also allow maximum power transfer without sacrificing the operating frequency bandwidth (see the previous problem). (Note that from Prob. 2, the maximum power that the waveguide can transmit without suffering from dielectric breakdown of the air is proportional to the cross-sectional area ab.) Find the maximum time-average power that the waveguide can transmit. Use a safety factor of 2 (hence, the maximum value of the electric field should not exceed E/2). The breakdown field strength E, in air is assumed to be 3x10° [V/m). a = 2.25 [cm], b = 1.125 [cm], P = 281.7 [kW]
This research suggests a multilayer printed circuit board technique for an air-filled substrate integrated waveguide (SIW).
It is particularly relevant for millimeter-wave applications, which often call for low cost, low loss, and great power handling performance. This three-layered, air-filled SIW enables significant loss reduction and improved power handling. A extremely compact, high-performance, low-cost, and self-packaged millimeter-wave integrated system can be created by using FR-4 as the baseband or digital circuits in the top and bottom layers of the system. It is demonstrated that over Ka-band (U-band), the air-filled SIW reduces losses by a mean value of 0.068 dB/cm in comparison to its dielectric-filled counterparts based on Rogers substrates RT/Duroid 5880 and likewise 6002.
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technician a says that the primary difference between deep-cycle batteries and sli is the thickness of the plates. technician b says that deeply discharging sli batteries dramatically shortens their service life. who is correct?
Both technician a and technician b are correct that SLI battery' service life is significantly shortened by deeply discharging them, and that the thickness of the plates is the main difference between both batteries.
A lead-acid storage and rechargeable battery known as an SLI battery is primarily utilized in internal combustion engines for vehicles and other internal combustion powered devices. Simply put, SLI stands for starting, lighting, and ignition. It is intended to start, run, and maintain power supply. SLI batteries use thinner lead dioxide-filled plates instead of the thicker ones used in deep cycle batteries. As opposed to the higher current produced by an SLI battery, deep cycle batteries deliver a steady, lower current. Deep cycle batteries are made for repeated discharge and recharge in applications like RVs, golf carts, floor scrubbers, and electric vehicles. Generally speaking, deep cycle batteries shouldn't be discharged below 80% depth of discharge.
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Which of the following are fundamental intuitions behind collaborative filtering? A) Similar users will rate the items similarly B) Similar users will not rate the items similarly C) Similar items will be rated similarly Answer choices Select only one option Only A and B
Only B and C Only A and C Only A
The statement that are fundamental intuitions behind collaborative filtering is Only A. The fundamental intuition behind collaborative filtering are similar users will rate the items similarly.
To point some of the limitations of content-based filtering, collaborative filtering uses similarities between users and items simultaneously to provide recommendations. The example of collaborative filtering is collaborative filtering give the recommendation system as preferences in television programming could analyze about which television show a user should like given a partial list of that user's tastes (likes or dislikes). There are two main kind of Collaborative Filtering:
User-based, is used to measure the similarity between target users and other users. Item-based, is used to measure the similarity between the goods that target users rate or interact with and other items.Learn more about the collaborative filtering here, https://brainly.com/question/14747907
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A system air pressure loss occurs on a trailer resulting in a gradual pressure bleed down. Which of the following will occur FIRST?
a. tractor-protection valve cuts service signal to the trailer
b. tractor-protection valve cuts the trailer supply
c. spring brakes on trailer begin to apply when pressure drops to 60 psi
d. service brakes on trailer apply
Option D is correct. Safeguards the air brake system in the event that the air suspension system leaks or fails.
A replaceable filter on Premium Valve prevents pollutants and other debris from getting into other air system components. The front or rear brakes won't function properly if one air system has very low pressure. As a result, stopping will take longer for you. Stop the car safely, then get the air brakes system fixed. safeguards the air brake system in the event that the air suspension system leaks or fails. A replaceable filter on Premium Valve prevents pollutants and other debris from getting into other air system components.
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explain why gypsum board is an excellent material for providing fire resistance in building assemblies.
Answer:
Board with glass fibres in the core provides better fire resistance than gypsum board without glass fibres. The fire resistance of wall assemblies with regular (standard) gypsum board increases as the density of the gypsum board increases. Layering the number of gypsum board on each side of the assembly from one to two improves the fire resistance rating. Well constructed and tested gypsum board wall assemblies offer a first line of defense against the spread of fire and lead to a more sustainable building.
what is the appropriate superelevation rate for a curve with a 1,200-ft radius on highway with a design speed of 60 mi/h?
A curve should superelevate at a rate of 6%.A 10% maximum superelevation has been advised for highways with hills that are not snow-bound.
How much super elevation can you get in total?Taking into account this mixed traffic, the IRC set a 7.0% or 0.07 maximum limit of superelevation on plain and rolling terrains and in snow-covered areas. A 10% maximum superelevation has been advised for highways with hills that are not snow-bound.By dividing the distance between the normal crown and full super by the transition length, one may calculate the rate of change in superelevation. 1,2000 - 60 = 11,940 Similar to the transition at the curve's beginning end, the rate of change is constant.To learn more about Superelevation refer to:
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a magnet made from a steel paperclip is most likely a(n) a. permanent magnet. b. temporary magnet. c. electron. d. lodestone. please select the best answer from the choices provided a b c d
Option A is correct. Only a strong magnetic field has the power to magnetize it. But after being magnetized, steel has the capacity to hold onto its magnetic properties.
Steel is suitable for use in permanent magnets thanks to this property. Since paperclips are not magnetic by nature, they cannot be chained together on their own. The paperclips can, however, be momentarily magnetic by employing a magnet. A paper clip's steel can be easily magnetic, but it quickly loses its magnetism. Steel wire is typically used to make paper clips. Steel is an iron and carbon alloy. Magnets are drawn to iron because it is a ferromagnetic material.
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Answer: A
Explanation:
which combination of n-type (n) and p-type (p) semiconductors would be used to amplify a weak electronic signal?
To boost a weak electronic signal, n-type (n) and p-type (p) semiconductors would be utilized in an n-p-n configuration.
How are p-type and n-type semiconductors combined?Electrons flow from the N-type zone to the P-type region when voltage is supplied by connecting the P-type to the "+" electrode and the N-type to the "-" electrode. Any remaining electrons that did not vanish due to recombination with holes travel to the "+" electrode, and current flows. The P-type region's holes are subject to the same procedure.
Which p- and n-type substances are mixed to create a diode*?A two-layer, two-terminal semiconductor device, the diode. A PN junction, also known as a diode, is created when n- and p-type semiconductor material are combined.
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4. question 4 a data analyst is creating a dashboard using tableau. in order to layer objects over other items, which layout should they choose? 1 point floating itemized layered tiled
A data analyst is creating a dashboard using tableau. in order to layer objects over other items, they should choose floating layout. Thus, the correct option is option A.
Who is a data analyst?A data analyst examines data to find key customer insights and potential uses for the information. They also share this information with the company's management and other interested parties.
Modern businesses rely heavily on data analysts to reflect on their work and customer base, determine how these factors have affected profits, and advise leadership on how to move forward and expand the company.
McKenzie claims that successful data analysts possess strong mathematical and statistical abilities as well as:
Analytical abilities to collect, view, and evaluate information.Arithmetical abilities to measure and statistically analyze dataTechnical abilities to organize and present data using software and scripting languages.Learn more about data analysts
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In an analog communication system, demodulation gain is defined as the ratio of the SNR at the output of the demodulator to the SNR at the output of the noise- limiting filter at the receiver front end. Find expressions for the demodulation gain in each of the following cases: 1. DSB. 2. SSB. 3. Conventional AM with a modulation index of a. What is the largest possible demodulation gain in this case? 4. FM with modulation index Bf.
A signal-to-noise ratio, sometimes written S/N or SNR, is a measurement of the system of the intended signal in relation to background noise in analog and digital communications (undesired signal).
By comparing the two levels and returning a ratio, a predefined formula can be used to calculate S/N. This ratio reveals if the desired signal is being impacted by the noise level. Typically, the ratio is given as a single decibel number (dB). The ratio might be either a positive or negative value, or it can be zero. The signal level is greater than the noise level when the signal-to-noise ratio is greater than 0 dB. The signal quality improves as the ratio rises.
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rd should be selected such that the maximum signal swing at the drain is - 0.8 v the input resistance at the gate should be
The input resistance at the gate should be 10 M and the maximum signal swing at the drain is -0.8 v. A common-source amplifier's output resistance and common-gate amplifier's input resistance are the same.
How is the input resistance determined?The resistance between the input terminals with either input grounded is known as input resistance, or ri. If VP is grounded in Figure 13.3, then ri = RDRN. Depending on the kind of input, ri's value can range from 107 to 1012.
What does a transistor's input resistance mean?A 40 A change to the base current causes a 2 mA change to the collector current. With a load of 4 k, this transistor serves as a common-emitter amplifier.
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which of the following is a primary function of exterior walls? group of answer choices control of conduction of heat prevent air leakage control light control sound control of the radiation of heat keeping water out
Typically, an exterior wall separates the interior space from the exterior space as part of the building envelope. Its duties include environmental control, which acts as a mediator between indoor and outdoor conditions. Security.
What is the primary function of the exterior wall?The rooms inside and outside of a structure are often separated by an outside wall, which is a component of the building envelope. Several of its features are:Setting a balance between indoor and outdoor environments is known as environmental control.Security.Privacy.managing fires.Aesthetics.It might have windows that let in light and provide views out, as well as openings for access and air. In masonry load-bearing construction, the outside wall may additionally support and transfer to the foundations the combined dead, imposed, and wind loads of the roof and floor construction.The external walls of a framed building may not carry any load, thus they are free from the weight of the roof and upper floors. The majority of the time, they are self-supporting and made to withstand wind loads, stop the spread of fire, and accommodate thermal movements.If there are large, unbroken wall lengths involved, joints allowing thermal fluctuations may be necessary.To Learn more About exterior wall refer to:
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technician a says that diesel engine oil operates at higher temperatures than spark-ignition engine oil because it cools pistons. technician b says that diesel engine oil operates at close to coolant temperature. who is correct?
Technician a is correct because he says that due to the cooling effect on pistons, diesel engine oil operates at higher temperatures than spark-ignition engine oil.
The diesel engine modeled after Rudolf Diesel is an example of a compression-ignition internal combustion engine, which ignites fuel by heating the air in the cylinder as a result of mechanical compression. Theoretically, diesel engines operate by compressing air to a high pressure and temperature, then injecting a small amount of fuel into the heated compressed air in cylinder. Due to the high temperature, the small amount of fuel that was injected and vigorously atomized evaporates.Diesel engines come in two different classes: two-stroke and four-stroke. Some bigger diesel engines operate on the two-stroke cycle, while most diesel engines utilize the four-stroke cycle. They generally have four or six in-line, direct-injection cylinders.
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lanes of traffic on expressways that flow in opposite directions are divided by a: a) solid yellow line b) solid white line c) median d) broken white line
Answer:
c) median
Explanation:
The lanes of traffic on expressways that flow in opposite directions are divided by a median. Thus, the correct answer is option C.
What are expressways?Expressway lane markings are one-of-a-kind, which means they differ on different roads. Parking or stopping on motorways is prohibited unless on the expressway's shoulder. Cloverleaf, diamond, and trumpet interchanges are the three most common types of expressway interchange.
A median separates traffic lanes on motorways that flow in opposite directions. The highway ahead is divided by a physical barrier or median. The "Divided highway" sign indicates that the two opposing lanes of traffic on the highway ahead are separated by some kind of physical barrier or median, such as a guardrail, concrete barrier, or a strip of land.
Therefore, median divides lanes of traffic on expressways that flow in opposite directions.
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7.26 an ic inverter fabricated in a 65-nm cmos process is found to have a load capacitance of 3 ff. if the inverter is operated from a 1.2-v power supply, find the energy needed to charge and discharge the load capacitance. if the ic chip has 5 million of these inverters operating at an average switching frequency of 2.5 ghz, what is the power dissipated in the chip? what is the average current drawn from the power supply?
In order to charge and discharge the load capacitance, 1.2V x 3F x 2 = 7.2 Joules of energy are required.
The chip can dissipate 7.2 Joules × 5,000,000 x 2.5 GHz, which is 90,000,000 Joules/s, or 90 MW.
The power supply is being used at an average current of 90 MW / 1.2V = 75 A.
What is energy?
Energy is the quantifiable attribute that is transmitted to a body or a physical system in physics. It is observable in the production of work as well as in the form of light and heat. Energy can be transformed in form but cannot be created or destroyed, according to the rule of conservation of energy.
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1. Write a program that allows you to enter a 6-digit PIN, like you would on your smartphone to unlock it. done in java using GUI. It should have the following layout:
[ DISPLAY PIN AS TYPED ] [ 1 ] [ 2 ] [ 3 ] [ 4 ] [ 5 ] [ 6 ] [ 7 ] [ 8 ] [ 9 ] [ < ] [ 0 ] Where [ < ] is a "backspace" button. The display should show the PIN as it is typed, and when the user enters the PIN 202113, the display changes to "YOU MAY ENTER!"
b. For the above program you wrote above, add a new feature. This could be to allow variable length PINs, match different PINs, allow users to select a PIN and then confirm it later, etc.
Describe your extension.
c. Add a feature were you listen for key strokes, like ‘1’ or ‘2’ for entering the PIN, and allow the user to either type or use the mouse
d. Add a secret PIN that get’s checked. If the user guesses the PIN, have your GUI change in some interesting way, such as change colors, or something else visual
A program that allows you to enter a 6-digit PIN, like you would on your smartphone to unlock it. done in java using GUI is as follows:
public static String getRandomNumberString() {
Random rnd = new Random();
int number = rnd.nextInt(999999);
print("you may enter");
return String.format("%06d", number);
}
What is a GUI?
A graphical user interface (GUI) is a user interface that lets users interact with electronic devices like computers and smartphones by using menus, icons, and other visual cues (graphics). In contrast to text-based interfaces, which only display data and commands as text, GUIs graphically display information and related user controls. A mouse, trackball, stylus, or a finger on a touch screen are all pointing devices that can be used to interact with GUI representations.
The first keyboard input and what is known as a prompt were used in the first human-computer text interface (or DOS prompt). At the DOS prompt, commands were entered to start a computer's responses. An awkward and ineffective user interface was produced by the use of these commands and the requirement for precise spelling.
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Consider a unity-feedback control system with the open-loop transfer function G(s) = K/ (s(s^2+s+4)
A) Determine the value of the gain K such that the phase margin is 50∘?
B) What is the gain margin for this case?
A) The phase margin is defined as the angle between the open-loop gain and the -180 degree line on the Bode plot.
To find the required value of K, we first need to find the gain (magnitude) at the frequency which corresponds to the phase margin angle.
At 50 degrees, the frequency is calculated as:
f_pm = 1 / (2π tan(50)) = 0.637 rad/s
The magnitude at this frequency can be determined by substituting s = j f_pm into the transfer function.
G(jf_pm) = K / (jf_pm (f_pm^2 + jf_pm + 4))
Simplifying, the magnitude of G(jf_pm) is:
|G(jf_pm)| = K / |f_pm (f_pm^2 + jf_pm + 4)| = K / 4.839
Therefore, the required value of K is:
K = 4.839 * |G(jf_pm)|
B) The gain margin is the minimum amount of gain needed to make the system stable. It can be determined by calculating the magnitude at the frequency which corresponds to the -180 degree angle on the Bode plot.
At -180 degrees, the frequency is calculated as:
f_gm = 1 / (2π tan(-180)) = 0
The magnitude at 0 frequency can be determined by substituting s = 0 into the transfer function.
G(0) = K / (0(0^2 + 0 + 4)) = K/4
Therefore, the gain margin is:
GM = 4/K
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Water is to be pumped from a lake to a ranger station on the side of a mountain (see figure). The length of pipe immersed in the lake is negligible compared to the length from the lake surface to the discharge point. The flow rate is to be 95 gal/min, and the flow channel is a standard 1-inch. Schedule 40 steel pipe (ID= 1.049 inch). A pump capable of delivering 8 hp(-Ws) is available. The friction loss F (ft lb/lbm) equals 0.041L, where L(ft) is the length of the pipe. (a) Calculate the maximum elevation, z, of the ranger station above the lake if the pipe rises at an angle of 30° (b) Suppose the pipe inlet is immersed to a significantly greater depth below the surface of the lake, but it discharges at the elevation calculated in Part (a). The pressure at the pipe inlet would be greater than it was at the original immersion depth, which means that ΔP from inlet to outlet would be greater, which in turn suggests that a smaller pump would be sufficient to move the water to the same elevation. In fact, however, a larger pump would be needed. Explain (i) why the pressure at the inlet would be greater than in Part (a), and (ii) why a larger pump would be needed. 30°
a) If the pipe rises at a 30° angle, the ranger station's maximum elevation, z, above the lake is 290 feet.
b) As we descend, the lake's pressure always rises. In comparison to point 2, point 3 has higher pressure. Because the rise in pressure is offset by the fall in datum, pump power remains constant for the same height, z=290 feet.
What is pressure?In the physical sciences, pressure is referred to as the stress at a point within a confined fluid or the perpendicular force per unit area. The force divided by the area over which it is exerted, or half a pound per square inch, determines the pressure that a 42-pound box with an area of 84 square inches at the bottom places on a floor.
Atmospheric pressure, which is roughly 15 pounds per square inch at sea level, is the amount of weight that the atmosphere exerts on each unit area of the Earth's surface. In SI units, pressure is expressed in pascals, where one pascal is equal to one newton per square meter. The atmosphere has a pressure of almost 100,000 pascals.
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Mayim is very good at math, especially probabilities and statistics. Which job in the supply chain is a good fit for her skills?
Answer:
Inventory Planner
Explanation:
An inventory planner is a specialist that is in charge of developing efficient inventory plans and strategies to enhance an organization's profitability. Inventory planners must create paperwork outlining the quantity specifications of the organization's goods or equipment.
the flip-flop input equations for a bcd counter using t flip-flops are given in section 6.4. obtain the input equations for a bcd counter that uses (a) jk flip-flops and (b)* d flipflops. compare the three designs to determine which one is the most efficient.
BCD counters count using BCD numbers from 0000 to 1001 before looping back to 0000 and repeating the process.
Since a decimal digit is represented by a binary code with at least four bits and a MOD-10 count, such a counter must have at least four flip-flops to represent each digit. JK flip flops and a NAND gate are used to build the BCD or decade counter circuit. Since the BCD system is a 4-bit binary counter, its architecture is quite straightforward and only calls for four JK flip flops. The decade counter's design is depicted below. A counter like the one in the circuit above that has three flip-flops will then count from 0 to 7 or 2n-1.
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tech a says that small vacuum leaks can be found with a vacuum gauge. tech b says that the catalytic converter is typically located after the muffler. who is correct?
Both are true. Tech A claims that a vacuum gauge can be used to locate tiny vacuum leaks. According to tech B, the catalytic converter is usually placed behind the muffler.
Which of the following links the catalytic converter to the exhaust manifold?Tailpipe. The catalytic converter has cleaned up the exhaust gases, which are then sent out of the car and into the atmosphere via the tailpipe, the last link in the exhaust system.
Which of the following exhaust system parts aids in lowering exhaust emissions?Hazardous pollutants from engine exhaust are decreased by the catalytic converter. The converter, which is situated between the exhaust manifold and the muffler, works with heat and metals that serve as catalysts.
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technician a says that batteries may slowly fail over time due to the loss of a cell or open circuits within the internal connections. technician b says that batteries may slowly fail over time through the gradual loss of capacity caused by plate deterioration. who is correct?
According to Technician B, the size, weight, and active area of the plates affect how much electrical energy a battery can generate.
A battery should show 12.6 volts when it is fully charged. For further testing, a measurement of 12.4 volts, which roughly equates to a charge of 75%, is sufficient. Any electrical or electronic device known as a voltage regulator keeps the voltage of a power source within allowable ranges. The voltage regulator is required to maintain voltages within the permitted range that the electrical equipment using that voltage can tolerate. The water is transformed back into the hydrogen and oxygen gasses that it was when the battery was first charged.
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2. water flows into the 1 m diameter tank at a rate of 0.006 m3/s. it also leaves through a 5 cm diameter orifice at the bottom. at a certain height h, the efflux equals the influx. determine this equilibrium height h. neglect all losses.
At the bottom, there is a 5 cm diameter orifice through which it also exits. The efflux and influx are equal at height h, and this height is 0.475 m for equilibrium.
inlet at top=0.006 m³/s
hole of outlet = 5 Cm
height = h
for efflux = influx
influx= 0.006 m³/s
efflux=outlet=area*velocity
π/4*0.05²=Area,velocity =[tex]\sqrt 2gh[/tex]
0.006=π/4*0.05*[tex]\sqrt 2gh[/tex]
so height h= 0.475m
The term "influx & efflux," which comes from Walt Whitman's "Song of Myself," describes daily movements in which external influences enter bodies, permeate and perplex their organization, and then leave, having changed into something new.
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in order to stop simple alternation between response alternatives on a concurrent schedule, you should program a
Simple switching between response options avoids a choice analysis because the distribution of behavior is constant.
The behavior of multiscale DPG particles in terms of distribution in porous media was observed using core scanning electron microscopy. The following are the precise test procedures: In order to calculate the pore volume and core permeability, the natural cores were taken, dried, and their dried weight was measured.
They were then saturated with water, and their wet weight was determined. The above-mentioned cores were removed and placed in a freeze dryer at -80°C for gelation for 24 hours; 1 PV of DPG particles (size of 2.2 m) were injected at a pump rate of 0.2 mL/min, and then left to stand at 90°C for aging for 5 days; the frozen dried cores were crushed.
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show that complex fourier series coefficients can be expressed as for each of the followig two periodic signals write the fourier series
Apparently, some people claim that every signal may be described as a Fourier series, notably in electrical engineering and musical signal processing.
This prompted me to consider the mathematical justification for such an argument.
However, even after reading through various materials on the Fourier series (which I have little background in but understand the notion of), I was unable to locate a mathematical justification for the claim that every function can be represented by a Fourier series. The need for the function to be periodic was alluded to.
Most functions cannot be expressed as Fourier series, as may be seen by a simple counting argument. A countable family of Fourier coefficients serves as the basis for a Fourier series, and as a result, the set of such series has cardinality c0, as opposed to the set of real valued functions defined on some interval, which has cardinality cc.
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technician a says the problem with new long-life anti-freeze is it can produce silicate drop-out, which plugs cooling system passages. technician b says that the problem with long life anti-freeze is that it is not compatible with all cooling system materials. who is correct?
Silicates, a compound salt containing silicon and oxygen molecules, act as resistors within the fluid to raise the boiling point and reduce the freezing point. They are present in this bright green, fluorescent liquid.
The silicate in the coolant is that white gunk. This is known as silicate dropout, and it occurs when the additives in antifreeze/coolant start to degrade after being used over their recommended lifespan. A system blockage would have resulted from this goo, and the silicate is a component of the corrosion inhibitor kit. Core plugs, also known as freeze plugs, frequently leak as a result of corrosion. The coolant can contact the metal surface of the freeze plug's back. Corrosion prevention is a feature of coolant or antifreeze.
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A large-particle composite consisting of tungsten particles within a copper matrix is to be prepared. If the volume fractions of tungsten and copper are 0.18 and 0.82, respectively, estimate the upper limit for the specific stiffness of this composite given the data that follow.
Specific Gravity Modulus of Elasticity (GPa)
Copper 8.9 110
Tungsten 19.3 407
Using the information provided, 19.65 GPa is the maximum specific stiffness of the composite that can be calculated.
We provide;
Copper has a specific gravity of _cu = 8.9.
Tungsten has a specific gravity of 19.3 (_tu).
Copper's elasticity modulus is 110 GPa.
E tu = 407 GPa is the tungsten's elasticity modulus.
Tungsten volume fraction: V tu = 0.7
Copper volume percent, V cu = 0.3
1) The maximum rigidity permitted;
Let's use the formula to determine the modulus of elasticity's maximum value;
E u is equal to (E cu V cu) plus (E tu V tu).
E u = (110 × 0.3) + (407 × 0.7)
E u = 317.9 GPa
The formula yields an upper bound for the specific gravity;
(_cu V cu) + (_tu V tu) = _u
ρ u = (8.9 × 0.3) + (19.3 × 0.7)
ρ u = 16.18
E/u = Specific stiffness
Stiffness specific = 317.9/16.18
Specific stiffness upper limit = 19.65GPa
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The beam in problem consists of material that will safely support tensile or compressive stress of 30ksi. Based on this criterion, determine the largest distributed load w
0
(in lb /in) the beam will safely support if it has the cross-section (a); if it has the cross-section (b).
Answer: solution
Explanation:
for some transformation having kinetics that obey the avrami equation (equation 10.17), the parameter n is known to have a value of 2.6. if, after 150 s, the reaction is 50% complete, how long (total time) will it take the transformation to go to 90% completion? enter your answer in accordance to the question statement s
The time taken is t = 259.04 sec will it take the transformation to go to 90% completion.
Johnson Mehl Avrami developed the Avrami equation, which is used to explain how crystalline solids change from one phase to another while maintaining a constant temperature. At constant temperature, solids change from one phase to another according to the Avrami equation. It can be applied broadly to various phase shifts in materials, such as chemical reaction rates, and can even be useful in assessments of ecological systems. It can particularly characterize the kinetics of crystallization. The Avrami equation gives us Y= 1 - e - Ktn, where Y = 50% T. Time of reaction completion is 148 seconds, and n = 1.8 is obtained by multiplying all values by 1. K \s 0.5=1- e^{-K*148^1.8} \s e^{-K*148^1.8} = 0.5
Taking both sides of the log
-K*148^{1.8} = -0.693 \s
K=8.59 * 10-5,
GIVEN THAT
0.85 = 1 - e
^{- 8.59 * 10^{-5} *t^1.8} \s e^{- 8.59 * 10^{-5} *t^1.8}
= 0.15
Taking the log on both sides: 8.59 x 10-5 t, t
= 259.04 sec,
t = -1.897 s
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gas in a cylinder expands against a piston from point a to point b on the p-v plot at the right. in this process the temperature a. increases b. decreases c. stays the same
Option b is correct. Gas in a cylinder expands against a piston from point a to point b on the p-v plot at the right. in this process the temperature decreases.
Think about a gas that is firmly sealed inside a vessel that has a moveable piston. By depressing the piston downward, we may manipulate the gas, and we can heat the gas by exposing the container to a flame or immersing it in a pot of boiling water. The pressure and volume of the gas can alter when we apply it to certain thermodynamic processes.
Using a PV diagram, also known as a pressure volume diagram, is an easy way to see these changes in the pressure and volume. On a PV diagram, each point represents a distinct gas condition. While the volume is indicated on the horizontal axis, the pressure is given on the vertical axis.
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