It is required to implement a single-phase transformer
(120:240V) at 60Hz for a given power s=2,8kVA. The core is iron,
armored type and cooling by natural convection. Perform the
appropriate calculat

Answer:

I cannot open the pdf file . There is some probem .So I dont know the answer

Answer:

yes.

Explanation:

Answer:

when car vroom it go electric

Explanation:

i think then it goes to some spinny thing that spins and make the electric and the electic spins the spinny thing and the smoke comes outside the back

Given sentence: ''To change a logic gate to its alternate representation''  is False. Because to replace the gate with its opposite type (e.g. replace an AND gate with an OR gate, or a NAND gate with a NOR gate).

Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the science of deductively valid inferences

To change a logic gate to its alternate representation, a simple two-step process is followed:

Invert the output of the gate (change 1 to 0 or 0 to 1).

Replace the gate with its opposite type (e.g. replace an AND gate with an OR gate, or a NAND gate with a NOR gate).

There is no need for a third step.

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With jQuery selectors, HTML elements can be "discovered" (or selected) depending on a wide range of factors, such as their name, id, classes, types, attributes, values of attributes, and much more.

It has some of its own original selectors in addition to being based on the current CSS Selectors. With the use of jQuery selectors, you can choose and modify HTML components (s). The prevent Default () method will stop the default action connected to the event if the event is cancellable. When you wish to prevent a form from being submitted when you click the "Submit" button, for example, this can be useful. A link's URL tracking stops when it is clicked. The jQuery object The Whole Set: The DOM elements that were chosen are all contained in the "wrapped set," a jQuery object that selectors return.

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The Cartesian and polar notation based on the information is solved below.

Cartesian notation:

P₁ - P₂ = (6cos(445°) - 2cos(460°))i + (6sin(445°) - 2sin(460°))j

≈ 3.43i - 2.91j

P₂ - P₁ = (-3.43)i + (2.91)j

Polar notation:

R1 = sqrt((6^2 + 2^2) - (262cos(460°-445°))))

≈ 3.91"

θ1 = atan2(6sin(445°) - 2sin(460°), 6cos(445°) - 2*cos(460°))

≈ -20.94°

R2 = sqrt((6^2 + 2^2) - (262cos(445°-460°))))

≈ 3.91"

θ2 = atan2(2sin(460°) - 6sin(445°), 2cos(460°) - 6*cos(445°))

≈ 159.06°

b) Cartesian notation:

P₁ - P₂ = (10cos(120°) - 4cos(40°))i + (10sin(120°) - 4sin(40°))j

≈ -5.74i + 8.66j

P₂ - P₁ = (5.74)i - (8.66)j

Polar notation:

R1 = sqrt((10^2 + 4^2) - (2104cos(40°-120°))))

≈ 11.18 cm

θ1 = atan2(10sin(120°) - 4sin(40°), 10cos(120°) - 4*cos(40°))

≈ 123.69°

R2 = sqrt((10^2 + 4^2) - (2104cos(120°-40°))))

≈ 11.18 cm

θ2 = atan2(4sin(40°) - 10sin(120°), 4cos(40°) - 10*cos(120°))

≈ -56.31°

c) Cartesian notation:

P₁ - P₂ = (4cos(4225°) - 3cos(45°))i + (4sin(4225°) - 3sin(45°))j

≈ -2.58i - 0.17j

P₂ - P₁ = (2.58)i + (0.17)j

Polar notation:

R1 = ✓(4^2 + 3^2) - (243cos(45°-4225°))))

≈ 4.14'

θ1 = atan2(4sin(4225°) - 3sin(45°), 4cos(4225°) - 3*cos(45°))

≈ -44

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Answer:

See explanation.

Explanation:

Since no figure was given I solved a problem that was similar to the one you described that I worked in my mechanics of materials class. The method should be very similar for your figure. See attached image for my work.

If it is subjected to the couple determine the maximum shear stress in regions AC and CB of the shaft. G st = 75 GPa. Than the answer will be 52Mpa.

We need to perform a two step process to obtain the maximum shear stress on the shaft. For the solid shaft,

P=2×pi×N×T/60 or T=60×p/2×pi×N

Where P=power transmitted by the shaft=50×10³W

N=rotation speed of the shaft in rpm=730rpm

Pi=3.142

T is the twisting moment

By substituting the values for pi, N and P, we get

T=654Nm or 654×10³Nmm

Also, T=pi×rho×d³/16 or rho=16×T/pi×d³

Where rho=maximum shear stress

T = twisting moment=654×10³Nmm

d= diameter of shaft= 40mm

By substituting T, pi and d

Rho=52Mpa

b. For a hollow shaft, the value for rho is unknown

T=pi×rho(do⁴-di⁴/do)/16

Rho=T×16×do/pi×(do⁴-di⁴)

Where

T= twisting moment=654×10³Nmm gotten above

do=outside shaft diawter=40mm

di= inside shaft diameter =30mm

Pi=3.142

Substituting values for pi, do, di and T.

Rho=76Mpa

Therefore, If it is subjected to the couple determine the maximum shear stress in regions AC and CB of the shaft. G st = 75 GPa. Than the answer will be 52Mpa.

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In an Airport Security System, passengers arrive at random every 2 minutes. The passengers are checked by a Checker with Triangular distribution having values (0.75, 1.5, and 3) for Minimum, Most likely and Maximum respectively. 93% of the passengers pass the security and are cleared whereas the rest are denied entry.

Simulate the system for replication length 20 days and find the results.The following are the steps that can be followed in order to simulate an Airport Security System:

Step 1: Generate interarrival times for passengers who arrive at random every 2 minutes. Use the exponential distribution, where the parameter is 30. This means that 1/30 = 0.0333. Therefore, the random time between passenger arrivals is 2 minutes, on average.

Step 2: Generate a random number to represent whether a passenger is cleared or denied entry. 93% of the passengers pass the security and are cleared whereas the rest are denied entry.

Step 3: Generate a random number to represent the time it takes for a Checker to check a passenger. Use a triangular distribution having values (0.75, 1.5, and 3) for Minimum, Most likely, and Maximum respectively.

Step 4: If a passenger is denied entry, do not add them to the queue. If a passenger is cleared, add them to the queue.

Step 5: Calculate the average waiting time for all cleared passengers and the percentage of denied entry after 20 days of replication.It is important to note that a simulation can be done using any programming language or simulation software. The replication length for this particular case is 20 days.

However, the time frame can be adjusted based on the needs and requirements of the simulation.

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Answer:

0.05%

Explanation:

From the question, we have;

The yield strength of the mild steel, \(\sigma _c\) = 43.5 ksi

Young's modulus of elasticity, ∈ = 29,000 ksi

The total strain, \(\epsilon _c\) = 0.2% = 0.002

The inelatic strain \(\epsilon_c^{in}\) is given as follows;

\(\epsilon_c^{in}\) = \(\epsilon _c\) - \(\sigma _c\)/∈

Therefore, we have;

\(\epsilon_c^{in}\) = 0.002 - 43.5/(29,000) = 0.0005

Therefore, the inelastic strain, \(\epsilon_c^{in}\) = 0.0005 = 0.05%

Taking the inelastic strain as the residual strain, we have;

The residual strain = 0.05%

Answer:

Electrical energy

The examples of social engineering are: a. Dumpster diving: It involves searching through a target's garbage or recycling bins to obtain information that can be used to gain unauthorized access. to a system or network.

d. Shoulder surfing: It involves looking over someone's shoulder to obtain sensitive information, such as  or PIN numbers, that can be used to gain unauthorized access to a system or network.

b. War dialing and c. Port scanning are not examples of social engineering. War dialing involves dialing a large number of phone numbers to find modems that can be exploited for unauthorized access, and port scanning involves scanning a computer system or network for open ports that can be used to gain unauthorized access. These techniques are more closely associated with network scanning and hacking rather than social engineering.

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Gas turbine cycle is a thermodynamic cycle used in gas turbine engines and jet engines. In a gas-turbine cycle, fuel is combusted with air in a constant-pressure combustion chamber at a pressure of 0.8 MPa. The combustion process can simplified by (1) assuming.

that it could be represented as a heat-addition process and (2) neglecting the mass flowrate of the fuel (i.e. assuming that only air goes in and out of the combustion chamber).In a gas turbine engine, the basic operation principle is to suck in air from the surrounding and compress it.

The compressed air is then heated by fuel combustion in a combustion chamber, and the resulting gas expands, driving a turbine that generates power. This turbine is connected to a compressor, and the air compression cycle starts all over again.

The resulting gas also passes through a nozzle, which generates additional thrust to propel the aircraft. In other words, a gas turbine engine is essentially a complex air pump.

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Answer:

Buyer is encouraged to obtain and read the booklet entitled "The Homeowners Guide to Earthquake Safety." In most cases a questionnaire within the booklet must be completed by Seller and the entire booklet given to the Buyer if the Property was built prior to 1960.

The square feet coverage of a gallon of primer may vary depending on the quality of the primer and the porosity of the surface being primed. On average, a gallon of primer can cover approximately 200-300 square feet. However, it is always best to consult the manufacturer's instructions for the specific primer being used as it will provide a more accurate estimate of coverage.

Generally, when buying paint or primer, it is important to know the coverage area to ensure that you purchase enough to cover the entire surface adequately. Factors such as the number of coats, the thickness of the coat, and the method of application will all play a role in determining the coverage area. For example, using a roller instead of a brush may result in a more even application and, therefore, use less primer. Furthermore, it is important to keep in mind that using too little primer may result in uneven coverage and may not provide adequate protection against moisture and other environmental factors.

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This type of calculation is called a mass balance calculation. Mass balance calculations are used to determine the steady-state concentrations of pollutants in a system as well as to calculate the residence time of water.

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The average amount of time that water (or any dissolved substance) spends in a certain lake is expressed by a calculated number known as lake retention time, also known as the residency time of lake water, water age, or flushing time.

The entire amount of the reservoir (the stock; typically stated as a mass or volume) and either the total rate of inflow (expressed in units of mass or volume per time) or outflow (expressed in units of mass or volume per time) can be used to calculate the residence time for water in a reservoir.

The amount of time it takes for all the water in a lake to completely replenish itself is known as the retention time. The retention times range amongst the Great Lakes. The retention duration for Lake Superior is far longer than the others, at 194 years as opposed to Lake Huron's 75 years.

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Answer:

C. Signal-to-quantization-noise ratio

Explanation:

339 Mpa is the engineering stress that corresponds to an engineering strain of 0.28.

The engineering stress is calculated by dividing F by the deformed specimen's cross-sectional area, A0. Engineering stress in ductile materials is evident after yield begins and is inversely related to the force (F) that decreases during the necking phase.

Engineering stress times exp(true strain) equals true stress, where exp(true strain) is 2.71 multiplied by engineering stress (true strain). Keep in mind that experimental data are typically noisy or unpredictable due to the fact that they are always inaccurate to some degree.

Because pressure is the dimension of stress, pressure's units are frequently used to measure its coordinates: pounds per square inch (psi) or pascals (Pa, or newtons per square meter in the International System).

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Based on the concept of circuit interruptions, and the available options, it is concluded that the correct answer is Ground fault circuit interrupter (GFCI).

Ground fault circuit interrupter (GFCI) is well known as a fast-acting circuit breaker designed to deactivate electric power when there is a ground fault within as little as 1/40 of a second.

Generally, the Ground fault circuit interrupter works by distinguishing the amount of current passing through and coming back from equipment along the circuit conductors.

The operation of a Ground fault circuit interrupter is defended on the principle of monitoring the imbalance of current between the circuit's ungrounded (hot) and grounded (neutral) conductor.

Hence, in this case, it is concluded that the correct answer is option A. Ground fault circuit interrupter (GFCI).

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Technician A is correct. The voltage drop test of a charging circuit should be performed when current is flowing through the circuit.

This is because voltage drop is the result of resistance within the circuit, and resistance only affects the voltage when current is passing through it.

When current flows through a circuit, it encounters resistance in various components such as wires, connectors, switches, and load devices.

This resistance causes a voltage drop across these components, meaning that the voltage at different points in the circuit will be slightly lower than the voltage at the battery.

By measuring the voltage drop across specific components in the charging circuit, technicians can identify any excessive resistance that may be causing issues with the charging system.

This can help pinpoint the location of a problem, such as a loose connection or a faulty component.

Technician B's suggestion of connecting the voltmeter leads directly to the positive and negative terminals of the battery would only measure the battery voltage itself, not the voltage drop across the charging circuit.

This measurement would not provide information about any resistance-related issues within the circuit.

Therefore, Technician A's approach of performing the voltage drop test when current is flowing through the charging circuit is the correct method to diagnose potential problems in the system.

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The correct condition for a firm wanting to maximize profit is "MRP = MC".

The marginal revenue product (MRP) is the additional revenue produced by hiring an additional unit of input (such as labour or capital) in a perfectly competitive market where companies are price takers.

The increased expense incurred by using an additional unit of input is represented by the marginal cost (MC).

A company should keep adding employees until the marginal revenue product (MRP) matches the marginal cost (MC) in order to maximise profits.

This requirement guarantees that the company is using its resources effectively and making the most profit feasible.

Therefore, for a company that wants to maximise profit, the correct condition is "MRP = MC".

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In this problem, we are asked to design a digital PID controller for a computer disk drive with given specifications. The transfer function of the read arm is given as G(s) = 1000, the bandwidth is 100 Hz, phase margin is 50°, and there is a constant bias torque from the drive motor. The sample rate is 6 kHz.

To design a digital PID controller, we first need to discretize the system. We can use the Tustin method for this purpose. The discretized transfer function can be expressed as:

G(z) = (1 + Ts/2) / (1 - Ts/2) * G(s)

where Ts is the sample time, which is 1/6000 seconds in this case.

Next, we need to determine the PID controller parameters Kp, Ki, and Kd. We can use the Ziegler-Nichols method to determine these parameters. For this, we need to determine the ultimate gain and ultimate period of the system.

The ultimate gain can be determined by increasing the gain Kp until the system becomes unstable. The ultimate period can then be determined as the period of oscillation at this instability point.

Using these values, we can determine the PID parameters as:

Kp = 1.2 * (Ku / G(z))

Ki = 2 * Ts / Pu

Kd = 0.5 * Pu

Finally, we need to add a bias term to the controller to cancel out the constant bias torque from the drive motor. This can be done by adding a feedforward term to the controller.

The complete digital PID controller can be expressed as:

C(z) = Kp + Ki * (1 - 1/z) + Kd * (1 - z^-1) + Kff * z^-1

where Kff is the feedforward gain, which can be determined as:

Kff = -Kp * G(z) * T / (1 + Kp * G(z) * T)

Once the controller is designed, we can simulate the system to verify that it meets the given specifications. The maximum closed-loop bandwidth should be 100 Hz, and the phase margin should be 50°. We can also plot the response of the system to a step input and verify that there is no steady-state error.

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ᴄᴏᴍᴘʟᴇᴛᴇɴᴇꜱꜱ ᴍᴇᴀɴꜱ ᴛʜᴇ ꜱᴛᴀᴛᴇ ᴏꜰ ʙᴇɪɴɢ ᴄᴏᴍᴘʟᴇᴛᴇ ᴀɴᴅ ᴇɴᴛɪʀᴇ; ʜᴀᴠɪɴɢ ᴇᴠᴇʀʏᴛʜɪɴɢ ᴛʜᴀᴛ ɪꜱ ɴᴇᴇᴅᴇᴅ.

ʙᴇᴀᴜᴛʏ ᴍᴇᴀɴꜱ combination of qualities, such as shape, colour, or form, that pleases the aesthetic senses, especially the sight.

Answer:

12.84 mg/L

Explanation:

We are given;

Volume of lake; V = 1.1 x 10^(6) m³

decay coefficient; K = 0.10/day = 0.1/(24 × 60 × 60) /s = 0.00000115741 /s

Factory rate: Q_f = 4.3 m³/s

Factory concentration: C_f = 100 mg/L

Stream rate: Q_s = 34 m³/s

Stream Concentration: C_s = 2.3 mg/L

Now, to find the steady state concentration of pollutant in the lake, we will use the formula;

(Q_s•C_s) + (Q_f•C_f) = (Q_f + Q_s)C_L + (KV•C_L)

Where C_L is the steady state concentration of pollutant in the lake.

Thus, making C_L the subject, we have;

C_L = [(Q_s•C_s) + (Q_f•C_f)]/(Q_f + Q_s + K•V)

Plugging in the relevant values gives;

C_L = ((34 × 2.3) + (4.3 × 100))/(4.3 + 34 + (0.00000115741 × 1.1 × 10^(6)))

C_L = 12.84 mg/L

Answer:

fibrocartilage

Answer: d consequences

Explanation:

Answer:

- Work done is 2.39 kJ

- heat transfer is 20.23 kJ/kg

Explanation:    

Given the data in the question;

First we obtain for specific volumes and specific enthalpy from "Table Properties Refrigerant 134a;

Specific Volume v₁ =  0.02547 m³/kg

Specific enthalpy u₁ = 243.78 kJ/kg

Specific Volume V₂ = 0.02846 m³/kg

Specific enthalpy u₂ = 261.62 kJ/kg

p = 8 bar = 800 kPa

Any changes in kinetic and potential energy are negligible.

So we determine the work done by using the equation at constant pressure

]Work done W = p( v₂ - v₁ )

we substitute

W = 800 kPa( 0.02846 m³/kg - 0.02547 m³/kg )

W = 800 kPa( 0.00299 m³/kg )

W = 2.39 kJ

Therefore, Work done is 2.39 kJ

Heat transfer;

using equation at constant pressure

Heat transfer Q = W + ( u₂ - u₁ )

so we substitute

Q = 2.392 kJ + ( 261.62 kJ/kg - 243.78 kJ/kg )

Q = 2.392 kJ +  17.84 kJ/kg )

Q = 20.23 kJ/kg

Therefore, heat transfer is 20.23 kJ/kg

Answer:

I think the answer is d: underground tunnel

Explanation:

Hope this helps