5. A wind turbine located at a height of 25m from ground, produces 800 kW. Its hub diameter negligible in comparison with length of the blade. Calculate the length of the blade. The average wind velocity is 12 m/s and wind density is 1.25 kg/m³.Gear box efficiency as 85%, Generator efficiency as 75% and Transmission efficiency as 80%. The value of C₂-0.29 and it is a horizontal type of wind turbine.

Answer:

genorator- electrical to mechanical

motor- mechanical to electrical

The shear stress that a designer should be most worried about is the yield shear stress. Yield shear stress is the stress level at which a material begins to deform plastically, resulting in permanent changes in its shape. It is a critical consideration because exceeding the yield shear stress can lead to structural failure or deformation beyond acceptable limits.

Designers need to ensure that the shear stress acting on a material does not surpass its yield shear stress to maintain the structural integrity and performance of the design.Furthermore, it is important to analyze the specific material properties, such as yield strength, to determine the maximum shear stress that can be sustained without causing permanent deformation or failure. By considering the yield shear stress and employing appropriate safety factors, designers can ensure the structural reliability of their designs.

Here are some tips for designers to avoid problems with shear stress:

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1. Administrator accounts: These accounts have complete control over the system and can perform any action, including installing software and changing system settings.

2. Standard user accounts: These accounts have limited privileges and can only perform basic tasks like running applications and accessing files.

3. Guest accounts: These accounts are temporary and are intended for users who need to access the system for a short period of time. They have very limited access and cannot make any permanent changes to the system.

4. Service accounts: These accounts are used to run background services and processes that do not require user interaction.

5. System accounts: These accounts are used by the operating system itself to perform various tasks and are not intended for user interaction.

If an engine fails during rollout or just before takeoff, immediately shut both throttles and land the aircraft safely. Before reaching a safe single engine speed right away after takeoff, drop your nose to increase velocity.

Closing the throttle, turning off the fuel pump, setting the mixture control to idle cutoff, and simply cranking the engine is the most reliable hot start method I've found.

If an engine fails during rollout or just before takeoff, immediately shut both throttles and land the aircraft safely. Before reaching a safe single engine speed right away after takeoff, drop your nose to increase velocity. If you are unable to climb, close both throttles and land straight ahead.

The typical practice for the majority of aircraft would be to abandon takeoff if an engine failed during takeoff. In small aircraft, the pilot should turn the throttles down to idle, activate the speed brakes (if provided), and apply the brakes as needed if the engine fails before VR (Rotation Speed).

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Answer:

frejfru8758u37

Explanation:

i need points

Answer:

C) Skull and crossbones

Explanation:

Its on the OSHA website under HCS Pictograms and Hazards

Answer:

oh this happened with me to ,this will be alright just wait a bit

Answer:

a

Explanation:

The best description of the bonding in a3b is option a. the AB bond is largely ionic with a - on A.This statement accurately captures the nature of the bonding, indicating that element a (A) has a partial negative charge (-) due to the transfer of electron(s) to element b.

The bonding in a3b is largely ionic is suggested by the fact that electronegativity difference between element a (0.8) and element b (3.0) is 2.2, which indicates a significant difference in their ability to attract electrons.

In an ionic bond, one atom (in this case, element b) has a higher electronegativity and tends to attract electrons more strongly than the other atom (element a). As a result, element b will acquire a partial negative charge, indicated by the presence of electron(s) in its outer shell, while element a will have a partial positive charge.

Since element b has a higher electronegativity, it can effectively pull the shared electrons towards itself, resulting in a partial negative charge. On the other hand, element a, with a lower electronegativity, will have a partial positive charge as it loses electron(s) to element b.

Therefore, the best description of the bonding in a3b is a. The AB bond is largely ionic with a - on A.

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Answer:

The final velocity of the rocket is 450 m/s.

Explanation:

Given;

initial velocity of the rocket, u = 0

constant upward acceleration of the rocket, a = 18 m/s²

time of motion of the rocket, t = 25 s

The final velocity of the rocket is calculated with the following kinematic equation;

v = u + at

where;

v is the final velocity of the rocket after 25 s

Substitute the given values in the equation above;

v = 0 + 18 x 25

v = 450 m/s

Therefore, the final velocity of the rocket is 450 m/s.

Answer:

89375 N

Explanation:

Rearrange the formula for normal stress for F:

\(\sigma=\frac{F}{A}\)

\(F=\sigma*A\)

Convert given values to base units:

275 MPa = \(275*10^{6}\) Pa

325 \(mm^{2}\) = 0.000325 \(m^{2}\)

Substituting in given values:

F = \((275*10^{6})*(0.000325)=89375\) N

Answer:

Explanation:

If the museum is running short of funds, and you decide to increase revenue. An increase or decrease in the price of admission into the museum depends on the following:

1. If demand for admission into the museum is elastic there are two possible outcomes

a. An increase in the price of admission leads to a decrease in the quantity demand of admission into the museum

b. A decrease in price of admission into the museum leads to an increase in the quantity demand of admission into the museum.

This follows the law of demand which states that "the higher the price, the lower the quantity demanded and the lower the price, the higher the quantity demanded".

2. If the demand for admission into the museum is inelastic, then an increase in price will lead to an increase in revenue of the museum.

Therefore, before the curator increase the price of admission into the museum, he should first determine the price elasticity of demand of the museum.

Answer: the shear strength at a depth of 12 ft is 1034.9015 lb/ft²

Explanation:

Given that;

Weight of soil r = 118 lb/ft³

stress parameter C = 250 lb/ft²

φ total = 29°

depth Z = 12 ft

The shear strength on a horizontal plane at a depth of 12ft

ζ = C + δtanφ

where δ = normal stress

normal stress δ = r × z = 118 × 12 = 1416

so

ζ = C + δtanφ

ζ = 250 + 1416(tan29°)

ζ = 250 + 1416(tan29°)

ζ = 250 + 784.9016

ζ = 1034.9015 lb/ft²

Therefore the shear strength at a depth of 12 ft is 1034.9015 lb/ft²

The entrance length in this pipe will be 17.72 feet.

From the information given, we need to calculate the velocity of air. This will be illustrated as:

= (4ft³ /s ) / π/4 (8/12)² ft²

= 12.45 ft/d

Expressing the Reynolds number

Re = Vd/v

= 11.45 × (8/12) / 1.57 × 10^(-4)

= 48658.84

The entrance length will now be:

Length = 4.4Re^1/6 × D

Length = 4.4(48658.84)^1/6 × (8/12)

Length = 17.72 ft

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The standard personnel practices that are part of the infosec (information security) function include:

1. Security awareness training: This practice involves educating employees on security principles, policies, and potential threats, which helps them identify and mitigate risks.

When integrated with infosec concepts, employees become more vigilant and proactive in protecting sensitive information and systems.

2. Background checks: Conducting thorough background checks on potential employees helps identify any risks they might pose to the organization's information security.

Integrating this with infosec concepts ensures that individuals with access to sensitive information are trustworthy and reliable.

3. Access control: Implementing proper access control measures ensures that only authorized personnel have access to sensitive information and systems.

When integrated with infosec concepts, access control measures are more robust and better aligned with the organization's security policies.

4. Incident response planning: This practice involves developing and maintaining procedures for detecting, responding to, and recovering from security incidents.

When integrated with infosec concepts, the incident response process is more efficient, and teams are better prepared to handle security threats.

When these standard personnel practices are integrated with infosec concepts, they become more effective in ensuring the organization's information security. This integration leads to stronger security measures, better risk management, and overall improved protection for sensitive data and systems.

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Answer:

a) The difference in mercury levels in the manometer is 2 centimeters.

b) The gage of the gas is 2.670 kilopascals.  

Explanation:

a) Pressure in gases is absolute. A manometer helps to determine the hydrostatic difference between pressure of the gas (\(P_{g}\)) and atmospheric pressure (\(P_{atm}\)), both measured in pascals. A kilopascal equals 1000 pascals and 1 meter equals 100 centimeters. That is:

\(P_{g}-P_{atm} = \rho \cdot g \cdot L\) (1)

Where:

\(\rho\) - Density of mercury, measured in kilograms per cubic meter.

\(g\) - Gravitational acceleration, measured in meters per square second.

\(L\) - Difference in mercury levels, measured in meters.

If we know that \(P_{g} = 104000\,Pa\), \(P_{atm} = 101330\,Pa\), \(\rho = 13590\,\frac{kg}{m^{3}}\) and \(g = 9.807\,\frac{m}{s^{2}}\), the difference in mercury levels in the manometer is:

\(L = \frac{P_{g}-P_{atm}}{\rho\cdot g}\)

\(L = \frac{104000\,Pa-101330\,Pa}{\left(13590\,\frac{kg}{m^{3}} \right)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}\)

\(L = 0.020\,m\)

\(L = 2\,cm\)

The difference in mercury levels in the manometer is 2 centimeters.

b) The gage pressure is the difference between gas pressure and atmospheric pressure: (\(P_{g} = 104000\,Pa\), \(P_{atm} = 101330\,Pa\))

\(P_{gage} = P_{g}-P_{atm}\) (2)

\(P_{gage} = 104000\,Pa-101330\,Pa\)

\(P_{gage} = 2670\,Pa\)

\(P_{gage} = 2.670\,kPa\)

The gage of the gas is 2.670 kilopascals.

Answer:

The difference lies in the coverage of the construction.  While local level construction focuses on the local area, national level construction has a nation-wide coverage.

Explanation:

Residential construction concentrates on the construction of residential buildings that have sleeping accommodations.  Such constructions are opposed to the construction of other buildings that are meant for commercial uses as they lack sleeping accommodations.  The federal, state, and local governments can embark on the construction of residential quarters for their residents.  The constructions are also funded at the given level.  When it is locally funded, the construction is meant to satisfy specific local needs.  The constructions by the federal government consider the needs of many localities, and may not meet specific local needs.

Answer: A Residential construction is local in its effects even though those effects have a national impact.

Explanation:

Power prestige is a type of position power.

Power prestige is a type of position power. Position power refers to the authority and influences a person has in an organization due to their position or rank. Prestige power specifically stems from the respect and admiration others have for someone's status or accomplishments.

There are other types of position power, such as information power (having access to valuable knowledge), referent power (based on a person's likability and the desire of others to be associated with them), and expert power (derived from a person's unique skills or expertise). However, none of these terms fit the blank in your statement as accurately as prestige power.

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A DoD project called "digital engineering" will change how the DoD creates, distributes, uses, and maintains technologies. Digital engineering is described by the DoD.

As an integrated digital strategy that employs reliable sources of system data and models as a continuum across disciplines to support lifecycle activities from idea through disposal.

According to Philomena Zimmerman, the deputy director of engineering tools and environments for the DoD, digital engineering does not reimagine the wheel but rather streamlines engineering procedures. According to her, digital engineering is the practise of doing engineering activities including design, analysis, prototyping, and idea exploration utilising models and computer resources. "The simplest way to conceive of it is that it's quite similar to a video game environment. However, in the domain of video games, we have the ability to create both extremely broad concepts—like moving vehicles around a battlefield—and very specific tasks, like [documenting] friction brought on by wind flow passing through turbine blades, according to Zimmerman.

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Answer:

Assume a value of 0.22 for the strain-hardening exponent, n.

Explanation:

To determine the total work done, heat transfer amount, and the process on a P-v diagram for the given scenario, we need to use the First Law of Thermodynamics, which states that the change in internal energy of a system is equal to the amount of heat added minus the amount of work done.

A) To find the total work done, we need to calculate the area under the curve of the pressure-volume diagram. This area can be divided into two parts: the work done in expanding the gas from initial volume to final volume, and the work done in increasing the pressure from an initial pressure to final pressure. Using the ideal gas law, we can find the initial and final states of the gas and then use the formula for work done: W = PΔV. The total work done can be found by adding the work done in expansion and compression.

B) The heat transfer amount can be found using the formula Q = ΔU + W, where ΔU is the change in the internal energy of the system. We can find the change in internal energy using the First Law of Thermodynamics and then add the work done to find the heat transfer amount.

C) To show the process on a P-v diagram, we need to plot the initial and final states of the gas and connect them with a curve. The curve will represent the process that the gas undergoes. The process can be either adiabatic, isothermal, or isobaric, depending on the amount of heat transfer and the type of work done.

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Answer:

In the second half of the 18th century the steam-engines invented by Thomas Newcomen and James Watt became the main way water was removed from mines. Mine-owners were always looking for cheaper and more effective ways of removing water from their mines. ....

The bending moments for the rectangular solid are:

a) M = 256,000 in-lb

b) M = 227,730 in-lb

a) To calculate the allowable bending moment for a solid rectangular timber beam, we can use the formula below:

M = (allowable stress)*(section modulus)

where M is the allowable bending moment and the section modulus is a measure of the beam's resistance to bending.

For a solid rectangular beam with nominal dimensions of 6 inches by 16 inches, the section modulus can be calculated as:

S = (b*h²) / 6

where b is the width of the beam and h is the height.

Substituting the values, we get:

S = (6*6²) / 6

S = 256 in³

Now, we can calculate the allowable bending moment as:

M = (allowable stress)*(section modulus)

M = 1000 psi*256 in³

M = 256,000 in-lb

Therefore, the allowable bending moment for the timber beam with nominal dimensions is 256,000 in-lb.

(b) For dressed dimensions, we need to adjust the section modulus calculation by subtracting the amount of wood that is removed during the dressing process. Assuming that the dressing process removes 1/8 inch from each side, the width and height of the dressed beam would be 5 3/4 inches and 15 1/2 inches, respectively.

Using these dimensions, the section modulus can be calculated exactly like above, but just with the different numbers:

S = (b*h²) / 6

S = (5.75*15.5²) / 6

S = 227.73 in³

Now replace that in the formula

M = 1000 psi x 227.73 in³

M = 227,730 in-lb

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(a) To determine the maximum feed rate, we need to find the metal removal rate for each hole. The metal removal rate is the product of the feed rate and the cross-sectional area of the hole being drilled.

For the 1/2 inch hole:
Cross-sectional area = \((π/4) * (1/2)^2 = 0.1963 in^2\)
Metal removal rate = feed rate * cross-sectional area
For the 3/4 inch hole:
Cross-sectional area =\((π/4) * (3/4)^2 = 0.4418 in^2\)
Metal removal rate = feed rate * cross-sectional area


Since the feed rate is the rate at which the drills move into the material, the cutting time for the operation will be the same for both holes.
Using the maximum feed rate of 2.35 in/min:
Cutting time = Distance / Feed rate
Cutting time = 1.0 inch / 2.35 in/min = 0.4255 min (approximately)
Therefore, the cutting time for the operation is approximately 0.4255 minutes.

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Answer:

Kh/Kv =  2.8

Explanation:

The horizontal conductivity = K1H1+K2H2+K3H3/(H1+H2+H3)

= K1H+K2H+K3H/3H

= K1+K2+K3/3

= 10-3 cm/sec + 10-3 cm/sec + 10-2 cm/sec/3

= 4 * 10^-3 cm/s

Vertical conductivity

= H+H+H/(H/K1 +H/K2+H/K3)

= 3/(1/K1+1/K2+1/K3)

= 1/700 cm/s

Kh/Kv = 4 * 10^-3 cm/s/ 1/700 cm/s

Kh/Kv =  2.8

Answer:

The City can grant higher budgets to emergency services like the Fire Department, so a higher budget will allow engineers & scientists to innovate new technology and add more fire stations across the city.

Explanation:

Engineers or architects can be asked to draw a sketch of a bridge-design on a graph sheet or A4 paper to communicate their ideas and scale their drawings.

Architectural sketches are about the communication of ideas. Engineers and architects use hand sketching to clarify elements of the design to the contractor or client.

It should be noted that drawings can also be drawn on a graph sheet or A4 paper to represent the detail before it's eventually constructed.

Scale drawings are used for the illustration of items that are not convenient to draw their actual size. In the construction industry, scales are used depending on the nature of the drawing. Drawings can be made on a graph or A4 paper due to the ease of printing, reproducing, and resizing the drawings.

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According to the question the Absolute velocity of B is V_B = (-2cosθ, 2sinθ) m/s.

Velocity is the rate at which an object changes its position in a given direction. It is a vector quantity, meaning it has both magnitude (the speed of movement) and direction. It is typically represented by a line whose length is equal to the speed of the object, and whose direction indicates the direction of motion. Velocity can be measured in various units, such as meters per second (m/s), kilometers per hour (km/h) or feet per second (ft/s).

Absolute velocity of B:

V_B = (-2cosθ, 2sinθ) m/s

Absolute velocity of C:

V_C = (-2cosθ + 2sinθ, 2sinθ) m/s

Absolute angular velocity of rod BC:

ω_BC = 2rad/s

Absolute acceleration of C:

a_C = (-2sinθ, 2cosθ) m/s^2

Absolute acceleration of B:

a_B = (-2sinθ, 2cosθ) m/s^2

Absolute angular acceleration of rod BC:

α_BC = 0rad/s^2

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The power input required is Wcycle of 150KW and the minimum theoretical power required is Wcycle=54.55KW.

Given data:

Hot reservoir Temp Th=300 K

Cold reservoir Temp Tc=275 K

Heat transfer at cold reservoir Qc=600KW

To find out

a) Coefficient of performance \beta actual=4 (Cycle power in KW)

b)  The minimum theoretical power required Wcycle in KW

Assumption: Constant average values are used.

a) Actual cycle formula

             Wcycle=Qc÷\beta actual

                          =600/4

                          =150KW

b) maximum cycle coefficient formula

               B_{max}=Tc÷(Th-Tc )

                             =275÷(300-275 )

                              =11

For minimal theoretical power required

    \beta actual=B_{max}=11

 Actual cycle coefficient of performance can be determined by

    \beta actual=Qc÷Wcycle

            Wcycle=Qc÷\beta actual

                        =600/11

                        =54.55KW

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Answer:

C++ and Python

Explanation:

C++ and Python