which of these are devices that let employees enter buildings and restricted areas and access secured computer systems at any time, day or night?

a. Exit lighting power: 525.6 kWh/year (20% of 100 luminaires).

b. Egress lighting battery power: 0.45 kWh for 90 minutes.

c. Pool lighting considerations: Waterproof fixtures, safety compliance, proper mounting, electrical safety, maintenance.

a. To calculate the power used per year to keep the exit luminaires on:

b. To calculate the power needed by battery packs during a power outage:

c. Special considerations for installing luminaires above a public indoor swimming pool:

These considerations are important to ensure the safety, durability, and proper functioning of the luminaires in a public indoor swimming pool setting.

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Answer:

Water enters and leaves the 6-cm diameter pipe bend in Fig. P3.45 at an average velocity of 8.5 m/s. The horizontal force to support the bend against momentum change is 300 N. Find (a) the angle ϕ; and (b) the vertical force on the bend.

a) The angle \(\phi\) is 62.06°.

b) The vertical force on the bend is 180.47 N.

The weight of the water and the reaction force must be considered to determine the vertical force exerted on the bend. This analysis provides valuable insights into the behavior and structural requirements of the pipe bend in relation to the fluid flow, ensuring its proper functioning and structural integrity.

The objective is to determine two key parameters: the angle of deflection QQ of the pipe bend and the vertical force acting on it. By applying principles of fluid mechanics and equilibrium, the solution requires calculating the change in momentum of the water passing through the bend and equating it to the known horizontal force required to support the bend.

Given that,

The diameter (d)= 6 cm

The average velocity (v)=8.5 m/s

Consider the rate of change of momentum along the x-direction.

\(F_x=mass \times (\frac{Intial \ velocity-Final \ Velocity}{time})\)

\(F_x=m'[(V-(-Vcos\phi)]\)

\(F_x=\rho AV^2[1+cos\phi]\)

\(300=100\times(\frac{\pi}{4}(0.06)^2)\times(8.5)^2[(1+cos\phi)]\)

\([(1+cos\phi)]=1.4685\)

\(cos\phi=0.4685\)

\(\phi=cos^{-1}(0.4685)\)

\(\phi=62.06^{^\circ}\)

(b) Calculate the vertical force on the bend.

Consider the rate of change of momentum along the y-direction.

\(F_y=mass \times (\frac{Intial \ velocity-Final \ Velocity}{time})\)

\(F_y=m'[(0-(V-Vsin\phi)]\)

\(F_y=\rho AVsin\phi\)

\(F_y=(1000)\times(\frac{\pi}{4}(0.06)^2)\times(8.5)^2\times sin62.06^{\circ}\)

\(F_y=180.47 \ N\)

Therefore,

a) The angle \(\phi\) is 62.06°.

b) The vertical force on the bend is 180.47 N.

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The EMERGE platform is a cloud-based tool designed to help solve complex challenges by generating solutions. It utilizes a workbook that is separated into six sections, each of which contains tools that can assist in various aspects of problem-solving, innovation, and design thinking.

Here are two reports on the use of EMERGE tools:Report #1: The size-up of a wicked problemIn this report, six tools in the EMERGE platform workbook are used to size up a wicked problem facing a public service organization. The student may use the guidance document and rubrics available in the Assignment section of D2L to write this report. While the public service organization for the report may be the student's current employer, it is not required. This paper is worth 150 points.Report #2: Identifying Actions to Address the Wicked ProblemThe second report is worth 150 points, and it focuses on a second set of six tools in the EMERGE platform workbook that can be utilized to identify the necessary steps to address the wicked problem identified in the first report. To write this report, the student will also be able to use the guidance document and rubrics in the Assignment section of D2L.

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The rate of sensible heat removal is approximately 4,842,000 Btu/h. To calculate this, you would use the psychrometric chart to determine the enthalpy of the air at the initial condition and the enthalpy of the air at the final condition. The difference between those two enthalpy values is the amount of sensible heat removed from the air.

The rate of latent heat removal is approximately 4,472,000 Btu/h. To calculate this, you would use the psychrometric chart to determine the humidity ratio of the air at the initial condition and the humidity ratio of the air at the final condition. The difference between those two humidity ratios is the amount of latent heat removed from the air.

The rate of total heat removal is approximately 9,314,000 Btu/h. This is the sum of the sensible and latent heat removal rates.

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Answer:

option  C

Explanation:

The correct statement is As specific ions form a film on the metal surface, hence those ions which form films may be adequate to cause SCC

other options are wrong as ; specific ions are not necessary for metals and alloys and also an environment causing SCC for an alloy might not cause SCC of another alloy found in the environment

Answer:

a) 0.50613

b) 22.639 kJ

Explanation:

From table A-11 , we will make use of the properties of Refrigerant R-13a at 24°C

first step : calculate the  volume of R-13a  ( values gotten from table A-11 )

V = m1 * v1 = 5 * 0.0008261 = 0.00413 m^3

next : calculate final specific volume ( v2 )

v2 = V / m2 = 0.00413 / 0.25 ≈ 0.01652 m^3/kg

a) Calculate the mass of refrigerant that entered the tank

v2 = Vf + x2 * Vfg

v2 = Vf +  [ x2 * ( Vg - Vf ) ] ----- ( 1 )

where:  Vf = 0.0008261 m^3/kg, V2 = 0.01652 m^3/kg , Vg = 0.031834 m^3/kg  ( insert values into equation 1 above )

x2 = ( 0.01652 - 0.0008261 ) / 0.031834

     = 0.50613 ( mass of refrigerant that entered tank )

b) Calculate the amount of heat transfer

Final specific internal energy = u2 = Uf + ( x2 + Ufg ) ----- ( 2 )

uf = 84.44 kj/kg , x2 = 0.50613 , Ufg = 158.65 Kj/kg

therefore U2 = 164.737 Kj/kg

The mass balance  ( me ) = m1 - m2 --- ( 3 )

energy balance( Qin ) = ( m2 * u2 ) - ( m1 * u1 ) + ( m1 - m2 ) * he

therefore Qin = 41.184 - 422.2 + 403.655  = 22.639 kJ

Answer:

yes it is very hard you should find a reccomended doctor to aid in your situation. But in the meantime how about you give me that lil brainliest thingy :p

Answer:

Space Rovers

Explanation:

The engineering advancement of the invention space rovers has changed space exploration tremendously. The first space rover ever to go out onto another planet was made by NASA and put on mars to learn more about the red planet and see if there where any plausible signs of past or maybe even present life. This mission was incredibly successful and for the first time in space exploration history, there was a spacecraft that you could move around that could with do the conditions of the planet for weeks, months, sometimes years at a time, moving around taking pictures and constantly collecting data. This was revolutionary for scientists, this way they could get copious amounts of information just on rover and not having to send multiple crafts only to die in the first few hours but sending back a relative amount of information. With rovers you can have them collect samples and bring the back to earth, not something  that could’ve been done without a human, until rovers. They have completely changed and improved collecting data from other planets and have been one of the most revolutionary inventions when it comes to space exploration.

This is what I put for the answer, hope it helps in some way.

The term used for a menu that has a main menu and several submenus is a multiple-level menu.

Multiple-level menu allows users to navigate through different options and subcategories, making it easier to find the desired content or functionality. A multiple-level menu typically has a parent-child relationship, where the main menu is the parent and the submenus are the children. This allows for a hierarchical structure that organizes information in a clear and concise way. In contrast, a standard menu typically only has one level of options, while a single-level menu only displays one set of choices.

A multiple-level menu consists of a main menu (also known as the parent menu) and one or more submenus (also referred to as child menus). This type of menu helps to organize and categorize various options and functions in a user-friendly manner.

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Answer:

b

Explanation:

Answer:

Scheduling is a process of create a structure that shows the way a schedule is organized before developing a complete and final schedule of a project.

Explanation:

This is the initial step in of developing a project schedule for a capital cost project. At this stage, the estimates for the project are done involving the various actions in the project. A lot of details are included in this  schedule showing the activities that are to be performed and the constraints involved.

The types of materials are best for preventing heat transfer through convection include the following:

In Science, there are three (3) main types of heat energy transmission and these include the following:

Convection can be defined as a heat energy transfer process which typically involves the transfer of heat, as a result of the movement of mass.

Based on scientific research and experiments, convection is generally considered to be a more effective and efficient means of heat transport on planet Earth when compared to conduction.

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Answer:

Obviously you shouldn't rely just on the meter for your safety. You'd disconnect wall fuses or kill main switches before you start, using the meter just gives you some extra protection: with the meter you might notice for example that you've disconnected the wrong fuse and the unit is still live.

Explanation:

Hope it helps! :)

Answer:

here

Explanation:

try not to touch the Glass on Halogen Light Bulbs, even when changing the bulb. This is because when you touch a Halogen Light Bulb, you leave behind a residue on the Light Bulb which can in time cause the bulb to heat up unevenly, and even cause the bulb to shatter as a result.

The is_in_plane function takes testVector and normalVector as input and calculates the dot product using NumPy's dot function. It then checks if the dot product is equal to zero and returns the result (True if in plane, False otherwise). The example usage demonstrates how to use the function with the provided test vectors and normal vectors.

To determine if testVector lies in the samplePlane, we can check if the dot product between testVector and normalVector is zero. If the dot product is zero, it means the vectors are perpendicular and testVector lies in the plane. Here's the code snippet in Python:

import numpy as np

def is_in_plane(testVector, normalVector):

   dot_product = np.dot(testVector, normalVector)

   inPlane = dot_product == 0

   return inPlane

# Example usage

testVector1 = np.array([2, 0, -1])

normalVector1 = np.array([0, 1, 0])

inPlane1 = is_in_plane(testVector1, normalVector1)

print(inPlane1)  # Output: True

testVector2 = np.array([-1, 0.1, 1])

normalVector2 = np.array([0, 1, 0])

inPlane2 = is_in_plane(testVector2, normalVector2)

print(inPlane2)  # Output: False

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Answer:

final temperature = 26.5°

Explanation:

Initial volume of water is 1 x 1 x 1 = 1 \(m^{3}\)

Initial temperature of water = 20° C

Density of water = 1000 kg/\(m^{3}\)

volume of copper block = 0.46 x 0.46 x 0.46 = 0.097 \(m^{3}\)

Initial temperature of copper block = 100° C

Density of copper = 8960 kg/\(m^{3}\)

Final volume of water = 1 - 0.097 = 0.903 \(m^{3}\)

Assumptions:

mass of water remaining in the tank will be density x volume = 1000 x 0.903 = 903 kg

specific heat capacity of water c = 4186 J/K-kg

heat content of water left Hw = mcT = 903 x 4186 x 20 = 75.59 Mega-joules

mass of copper will be density x volume = 8960 x 0.097 = 869.12 kg

specific heat capacity of copper is 385 J/K-kg

heat content of copper Hc = mcT = 869.12 x 385 x 100 = 33.46 Mega-joules

total heat in the system = 75.59 + 33.46 = 109.05 Mega-joules

this heat will be distributed in the entire system

heat energy of water within the system = mcT

where T is the final temperature

= 903 x 4186 x T = 3779958T

for copper, heat will be

mcT = 869.12 x 385 = 334611.2T

these component heats will sum up to the final heat of the system, i.e

3779958T + 334611.2T = 109.05 x \(10^{6}\)

4114569.2T = 109.05 x \(10^{6}\)

final temperature T = (109.05 x \(10^{6}\))/4114569.2 = 26.5°

Answer:

116,090 Btus

Explanation:

A hydroelectric plant is an energy source from a reservoir that would provide affordable, abundant electricity for a factory.

A hydroelectric power plant or hydropower is a renewable source of energy that produces power by using a dam or diversion structure to change the natural flow of a river or other body of water. Hydroelectric power plant relies on the endless, constantly recharging system of the water cycle to generate electricity. In simple word the hydroelectric power plant generates energy by harnessing the power of water in motion, such as water flowing over a waterfall, to produce electricity.

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The correct answer is I mentioned earlier, the question lacks specific information that is needed to provide a precise answer. The number of millimeters indicated by a Vernier caliper will depend on the position of the sliding scale and the Vernier scale relative to the object being measured.

To use a Vernier caliper, the object being measured is placed between the jaws of the caliper, and the position of the sliding scale is adjusted until it touches the object being measured. The position of the sliding scale is then read off the main scale in millimeters, and the position of the Vernier scale is read off the Vernier scale. The difference between the main scale reading and the Vernier scale reading gives the measurement to the nearest fraction of a millimeter. Therefore, without specific information about the position of the sliding scale and Vernier scale relative to the object being measured, it is impossible to provide a specific answer. If you can provide more information, such as the position of the sliding and Vernier scales, I may be able to give you a more precise answer.

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Answer:

Because the shunt winding consist of a large number of turns,

Explanation:

It is nearly impossible to obtain satisfactory performance from a shunt motor connected to an ac power source because the shunt winding consist of a large number of turns, due to the high number of turns that the DC shunt motor has it develops a high impedance when connected to an ac power source. and due  to this high impedance the amount of current that flows through the field will be very low making it nearly impossible for the shunt motor to operate properly

The CONVERT() function can be used to display data in a different data type.

It is commonly used in SQL to convert between various data types such as VARCHAR, INT, and DATE, ensuring proper formatting and compatibility with database operations.The CONVERT() function in SQL can be used to display data in a specific format. It allows you to convert a value from one data type to another or to convert a date/time value from one format to another.

For example, you can use the CONVERT() function to convert a date/time value to a different format, such as converting a date in the format 'YYYY-MM-DD' to 'DD/MM/YYYY'. You can also use the CONVERT() function to convert numeric values from one data type to another, such as converting a decimal value to an integer value.

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P is the nοrmal fοrce alοng the x-axis, Py is the nοrmal fοrce alοng the y-axis, V is the shearing fοrce alοng the x-axis, and Vy is the shearing fοrce alοng the y-axis.

Shearing bοundary fοrce is an external fοrce applied tο a sοlid bοdy, usually in the fοrm οf a nοrmal fοrce, that causes the bοdy tο defοrm. The fοrce is applied in a directiοn perpendicular tο the surface οf the bοdy and acts tο reduce οr increase the relative displacement οf the bοdy's particles, resulting in an οverall shearing οf the bοdy.

Stress functiοn φ = pry is a mathematical expressiοn that describes the stress state in a plate. It states that stresses in the plate are prοpοrtiοnal tο the distance frοm the οrigin, r, and the cοnstant, p. The resultant nοrmal and shearing bοundary fοrces (P, Py, V, and Vy) alοng all edges οf the plate can then be calculated using the stress functiοn.

P is the nοrmal fοrce alοng the x-axis, Py is the nοrmal fοrce alοng the y-axis, V is the shearing fοrce alοng the x-axis, and Vy is the shearing fοrce alοng the y-axis.

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Languages such as COBOL, when used in a database environment, are called host languages.

In a database environment, when languages like COBOL are utilized, they are commonly referred to as host languages. Here is a detailed explanation of the options provided:

1. Data dictionaries: Data dictionaries refer to centralized repositories that store metadata and information about the structure, organization, and characteristics of data elements within a database. They are not specific to any programming language.

2. Clients: Clients typically refer to the end-users or applications that interact with a database system. While COBOL programs can act as clients that access and manipulate data in a database, this term is not specific to COBOL or any other particular programming language.

3. Retrieval/update facilities: Retrieval and update facilities generally pertain to the capabilities provided by a database system to retrieve and modify data. While COBOL programs can utilize these facilities to interact with a database, this term does not specifically refer to COBOL or other languages.

4. Host languages: In a database environment, the term "host language" refers to the primary programming language used to develop applications that access and manipulate data in the database. COBOL, along with languages like C, Java, or Python, can serve as host languages depending on the database system being used.

5. Data definition languages: Data definition languages (DDL) are used to define the structure and schema of a database, including tables, views, indexes, and constraints. COBOL is not typically considered a data definition language, although it can be used in conjunction with DDL statements to create or modify database structures.

Therefore, in the context of a database environment, languages like COBOL are commonly referred to as host languages because they act as the primary programming languages for developing applications that interact with the database.

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Voltage : Vin = Vin(t) = sin(ωt)

Resistance R = 100Ω

According to Ohm's law, Voltage in a circuit is directly proportional to current flowing through it.

The proportionality constant in this case is equal to resistance.

So,

V ~ R

V = IR

as it is given that,

V = sin(ωt)

The maximum value of sign function is equal to 1.

So the maximum voltage in given case = V = 1 volt

Resistance given R = 100Ω

So,

Current according to Ohm's law : I = V/R

putting all the values in equation 2,

I = 1/100 = 0.01 A

so current in this case I = 0.01 ampere

I = 10 mili ampere

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