The most commonly installed type of fire sprinkler system is the wet-pipe system. In a wet-pipe system, the pipes are filled with water and are pressurized so that when the heat of a fire activates the sprinkler head, water is released onto the fire.
Pre-action systems use a separate water line to fill the pipes with water and need to be triggered by another type of detector such as smoke or heat, while dry-pipe systems have pressurized air or nitrogen in the pipes and the water is released when the heat of a fire activates the sprinkler head. Deluge systems are used when large amounts of water need to be released quickly, such as when a large area needs to be flooded quickly.
In order to install a wet-pipe system, the pipes must be connected to a water source and the sprinkler heads must be placed at the correct height in the room. Once the system is installed, it must be tested regularly to make sure that it is functioning properly. It is also important to remember that water damage can be caused by a malfunctioning system, so it is important to regularly check and maintain the system.
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which safety hazard are firefighters most likely to find in the space between the ceiling and the roof?
Firefighters are most likely to find the following safety hazards in the space between the ceiling and the roof: accumulation of combustible material, poor ventilation, and exposure to hazardous chemicals.
Accumulation of combustible materials such as wood, paper, insulation, and other debris can provide fuel for a fire, which can be difficult to contain in a confined space like the one between a ceiling and a roof.
Poor ventilation in this space can make it difficult for firefighters to breathe, and they can be exposed to hazardous chemicals such as asbestos, lead, and dust. Firefighters have to be careful with that.
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For load-bearing applications, engineered materials are selected by matching their mechanical properties to the component's design specifications and service conditions.
a. True
b. False
The statement "For load-bearing applications, engineered materials are selected by matching their mechanical properties to the component's design specifications and service conditions" is true because when selecting materials for load-bearing applications, one must consider the mechanical properties of those materials.
A load-bearing structure is a structure designed to carry the weight of the building or any other construction's imposed loads (people or objects). Such structures must be capable of holding the loads applied to them without failing (or cracking) under the pressure.
The mechanical properties of materials are used to determine which materials are best suited for bearing loads. A material's ability to sustain external forces without cracking, breaking, or otherwise failing is known as its mechanical properties.
Engineering materials are frequently employed in load-bearing applications. Therefore, when selecting materials for load-bearing applications, one must consider the mechanical properties of those materials.
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determine the in-phase and quadrature components as well as the envelope and the phase of fm- and pm-modulated signals.
For FM modulation, the in-phase and quadrature components can be determined by differentiating the phase of the modulating signal with respect to time. The envelope can be determined by taking the absolute value of the modulated signal, and the phase can be determined by taking the phase angle of the modulated signal.
For PM modulation, the in-phase and quadrature components can be determined by integrating the phase of the modulating signal with respect to time. The envelope can be determined by taking the absolute value of the modulated signal, and the phase can be determined by taking the phase angle of the modulated signal.
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steel expands 1 part in 100,000 for each 1 celsius increase in temperarture. if the 1.5-km main span of a steel suspension bridge had no expansion joints, how much longer would it be for a temperature increase of 20 celsius
The 1.5-km main span of a steel suspension bridge would be 30 meters longer for a temperature increase of 20 Celsius.
This is because steel expands 1 part in 100,000 for each 1 Celsius increase in temperature. Therefore, a 20 Celsius temperature increase would result in a 20 x 100,000 = 2,000,000 parts expansion. Since 1.5 km = 1,500,000 parts, 2,000,000 parts expansion would equate to an additional 500,000 parts or 500 meters. Since 1 meter = 100 parts, 500 meters = 500 x 100 = 50,000 parts.
Therefore, the 1.5-km main span of a steel suspension bridge would be 50,000 parts or 30 meters longer for a temperature increase of 20 Celsius.
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when making a precision runway monitoring (prm) approach, there is a special requirement for it. what is it?
When making a Precision Runway Monitoring (PRM) approach, there is a special requirement for it. The special requirement when making a Precision Runway Monitoring (PRM) approach is to have a second controller in the control tower operating as a monitor.
The PRM approach can be used in situations where parallel runways are too close to each other, and this approach can keep the aircraft on course and on glidepath while keeping a safe distance from the other runway. PRM also assists aircraft in the event of an unexpected equipment failure or any unusual emergency incident.
PRM is an approach for precision runway monitoring that has been developed to enable simultaneous independent instrument approach procedures on closely spaced parallel runways. It incorporates extremely precise monitoring of the aircraft by the controllers. This involves the use of an advanced monitoring system that includes high-resolution radar equipment and modern processing technology, which offers the controller real-time details on the progress of the aircraft during an instrument approach.
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for designing heat exchangers at the pinch, what is the criterion for matching streams above the pinch and what is the criterion for matching streams below the pinch? why are such criteria needed? (10 points)
The criteria for matching streams above the pinch for designing heat exchangers is to make sure that the hot stream and the cold stream are both having the same temperature. The criteria for matching streams below the pinch is to make sure that the hot stream and the cold stream have the same heat capacity.
These criteria are needed to ensure that there is an efficient heat exchange, meaning that the hot stream will give up most of its heat to the cold stream. In order for this to occur, it is essential that the temperature and heat capacity of the two streams are similar. If the temperatures of the hot and cold streams are too different, the efficiency of the heat exchange will be greatly reduced.
Similarly, if the heat capacities of the hot and cold streams are too different, the heat exchange will not be efficient. Thus, these criteria are necessary for efficient heat exchange.
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(T/F) care must be taken when working with parallel circuits because current can be flowing in one part of the circuit even though another part of the circuit is turned off.
This statement is true. In a parallel circuit, there are multiple pathways for the flow of electric current.
If one of these pathways is turned off, such as by a switch, the other pathways may still be conducting current. This means that care must be taken when working with parallel circuits because it is possible for current to be flowing in one part of the circuit even though another part of the circuit is turned off. As a result, it is important to properly isolate and de-energize all parts of the circuit before working on any part of it to prevent electrical shock or damage to equipment. This is a fundamental concept in electrical safety and circuit design.
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the beam ab is loaded and supported as shown: a) how many support reactions are there on the beam, b) is this problem statically determinate, and c) is the structure stable?
There are three support reactions, the problem is statically determinate, and the structure is stable.
There are three support reactions on the beam AB: one at each end and one at the middle support.
Yes, this problem is statically determinate. A structure is statically determinate when the number of unknowns (support reactions) equals the number of equations (force balance equations). In this problem, there are three support reactions and three equations of equilibrium.
The structure is stable, meaning that it will remain in its current configuration without any deformations. This can be seen by considering the equilibrium of forces in the vertical direction. There are two forces pushing down on the beam (the load and the reaction at the left end) and one force pushing up (the reaction at the right end). The net force is down, so the structure is stable.
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calculate the cumulative infiltration and the infiltration rate on a silty clay soil after one hour of rainfall at 1cm/h if the initial effective saturation is 20 percent. assume ponding depth h0 is negligible in the calculations.
The cumulative infiltration and infiltration rate on a silty clay soil after one hour of rainfall at 1cm/h with initial effective saturation of 20 percent are 252 cm and 4.21 cm/h, respectively.
To calculate the cumulative infiltration and the infiltration rate on a silty clay soil after one hour of rainfall at 1cm/h if the initial effective saturation is 20 percent, we need to first calculate the cumulative infiltration (Icum) and infiltration rate (f). The cumulative infiltration is given by the equation: Icum = h0 + ∫f (dt). Here, h0 is negligible and ∫f (dt) = f x t. So, Icum = f x t.
The infiltration rate can be calculated using the Kostiakov equation: f = K x t1/2. Here, K is the Kostiakov coefficient, which is a function of the initial effective saturation (Si). For a silty clay soil, K = 0.0026 x Si0.5 (cm/min1/2). Thus, in this case, K = 0.0026 x 200.5 = 0.164 cm/min1/2. Since the rainfall intensity is 1 cm/h, t = 1 hour = 60 min. So, the infiltration rate, f = 0.164 x 601/2 = 4.21 cm/h. The cumulative infiltration is Icum = 4.21 x 60 = 252 cm. So, the answers are 252 cm and 4.21 cm/h, respectively.
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true or false. for the modified goodman diagram, states of completely-reversing stress appear on the horizontal axis.
True, for the modified Goodman diagram, states of completely-reversing stress appear on the horizontal axis.
What is the Goodman diagram?
A Goodman diagram is a plot of the mean stress versus the alternating stress that aids in determining the fatigue endurance of a material. It is named after its creator, Walter Goodman, and is also known as a Goodman plot, a Haigh diagram, or a modified Gerber diagram. The Goodman diagram was created to determine the fatigue endurance of metallic materials that are subjected to varying tensile and compressive loads, such as machinery or structures under dynamic loading, such as aircraft, automobiles, and trains, among others.
Goodman Diagram and Completely-Reversing Stress: In the modified Goodman diagram, the states of completely-reversing stress appear on the horizontal axis. If one stresses the material equally in both the positive and negative directions, it is called a completely reversing stress. The reversing stress can be a fully reversed alternating stress, a zero mean stress, and a reversing torsion in the form of an alternating torque. The Goodman diagram also specifies a limiting line above which the material cannot withstand any more stress without failing, known as the material's endurance limit or fatigue strength limit. The Goodman Diagram is used to analyse the different kinds of stresses which are affecting the component of a structure. These stresses may include alternating and completely reversing stresses. One of the most important features of this diagram is its ability to detect the failure of a material due to the effect of the reversing stress.
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what device will produce an electrical current when a turbine is used to rotate an iron core wrapped with a coil of wire near a magnet?
A device that will produce an electrical current when a turbine is used to rotate an iron core wrapped with a coil of wire near a magnet is a generator.
A generator is a device that uses electromagnetic induction to convert mechanical energy into electrical energy. It operates on the basis of the Faraday Law of Electromagnetic Induction, which states that a current is induced in a conductor that is moving through a magnetic field.
The following components are found in a basic generator:
1) rotating magnetic field 2) rotating armature 3) wires 4) coils 5) commutator 6) brushes
Generators are used in a variety of applications, including power plants, wind turbines, and hydroelectric facilities. They are essential for converting mechanical energy into electricity. They have also been utilized as backup power supplies for homes and businesses.
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true or false: in a single-stream, steady flow system, the mass flow rates for the inlet and outlet must be the same. true false question. true false
Answer:
True
Explanation:
in a single-stream, steady flow system, the mass flow rates for the inlet and outlet must be the same is true
The LM358 op amp can be a single or dual supply op-amp. This mean that it can operate with just a single supply i.e. + 5 volt or with dual supplies i.e. (+ and -) 5 volt supplies. With a non-inverting configuration with dual supplies (+5v and -5v) being supplied to the LM358 Please answer the following questions.
1.What is the gain formula for a non inverting op amp?
2.With this configuration, is there a maximum output voltage peak to peak, if so what would it be?
3.This op amp is configured for a gain of 11. Input signal is an AC sine wave signal. What is the maximum AC peak to peak voltage input?
4.What happens to your output signal when the input signal is above the maximum peak to peak input voltage?
1) Gain (A) = (Vout / Vin) = 1 + (Rf / Rin)
2) Yes
3) The maximum AC peak to peak voltage input would be (10V / 11) = 0.91V.
4) the output signal will be clipped at the maximum output voltage peak to peak
1. The gain formula for a non-inverting op amp is given by the following equation:
Gain (A) = (Vout / Vin) = 1 + (Rf / Rin)
Where R(f) is the feedback resistor and R(in) is the input resistor.
2. Yes, there is a maximum output voltage peak to peak. The maximum output voltage peak to peak is equal to the voltage supply minus the voltage drop across the diodes. In this case, it would be 10V peak to peak.
3. The maximum AC peak to peak voltage input would be determined by the maximum output voltage peak to peak divided by the gain. The maximum AC peak to peak voltage input would be (10V / 11) = 0.91V.
4. When the input signal is above the maximum peak to peak input voltage, the output signal will be clipped at the maximum output voltage peak to peak. This means that the output signal will be distorted and will not accurately represent the input signal.
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the allowable shearing stress is 15 ksi in the 1.5-in.-diameter steel rod ab and 7.7 ksi in the 1.8-in.-diameter brass rod bc. neglecting the effect of stress concentrations, determine the largest torque t that can be applied at a.
The largest torque that can be applied at point A without exceeding the allowable shear stress for either rod is T=44.99 k-in.
The largest torque that can be applied at point A can be determined by using the equation for shear stress of a shaft:
τ=T/J
where τ is the shear stress, T is the applied torque, and J is the polar second moment of inertia.
For the 1.5-in.-diameter steel rod AB:
J=(π/32)D4
where D is the diameter of the rod, so for a 1.5-in. rod, J=(π/32)(1.5)4=3.704 in4.
So, the largest torque that can be applied at point A while maintaining a shear stress of 15 ksi is T=(15 ksi)(3.704 in4)=55.56 k-in.
For the 1.8-in.-diameter brass rod BC:
J=(π/32)D4
where D is the diameter of the rod, so for a 1.8-in. rod, J=(π/32)(1.8)4=5.848 in4.
So, the largest torque that can be applied at point A while maintaining a shear stress of 7.7 ksi is T=(7.7 ksi)(5.848 in4)=44.99 k-in.
Therefore, the answer is T=44.99 k-in.
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a foundation system consisting ofsite-cast, reinforced concrete grade beams supported by drilled piers is considered a:
A foundation system consisting of site-cast, reinforced concrete grade beams supported by drilled piers is considered a deep foundation system.
Deep foundation systems are used to transfer structural loads to a lower, more stable depth than a shallow foundation system. Deep foundation systems are used when soils at the surface are not suitable to support the weight of the structure, or when a structure is constructed in an area with deeper water table levels.
Reinforced concrete grade beams are structural elements that are used to provide support for building foundations. They are usually reinforced with steel rebar and have additional strength compared to standard concrete. Drilled piers are cylindrical structures that are constructed by drilling into the earth and then filling them with reinforced concrete. These piers can also be reinforced with steel rebar.
Together, these elements are designed to provide a strong, stable foundation for a structure by distributing the load across a larger area. They can also be used to reinforce existing foundations or to increase the load-bearing capacity of a foundation system. Deep foundation systems can be used for a variety of applications, including buildings, bridges, and other large structures.
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Please solve this asap
a) The speed of the link's rotation is therefore: [tex]v_O_Q = 33.54 m/s k[/tex]
b) The acceleration of the slotted link at point P is therefore:
[tex]a_O_Q = a_P + \alpha_OQ x r_PQ - \omega_OQ[/tex]
How to solvea. To find the velocity of the peg with respect to the slotted link, we need to subtract the velocity of the slotted link at point P from the velocity of the peg at point P.
The velocity of the slotted link at point P can be found by using the velocity relationship for a slotted link:
v_OQ = v_P + omega_OQ x r_PQ
where:
[tex]v_O_Q[/tex] is the velocity of point Q on the slotted link, [tex]\omega_OQ[/tex] is the angular velocity of the slotted link,[tex]r_P_Q[/tex] is the distance from point P to point Q on the slotted linkx represents the vector cross product.At the instant shown in the diagram, the slotted link is rotating counterclockwise with an angular velocity of:
[tex]\omega_OQ = d\theta/dt = (15 deg)/(1 s) = 15 rad/s[/tex]
The distance from point P to point Q on the slotted link is:
[tex]r_P_Q = \sqrt{[(0.9 m)^2 + (0.6 m)^2]} = 1.08 m[/tex]
The velocity of the slotted link at point P is therefore:
[tex]v_O_Q = v_P + omega_O_Q * r_P_Q[/tex]
= 10 m/s + (15 rad/s) x (1.08 m) x k
= (10 + 16.2) m/s k
= 26.2 m/s k
The relative velocity of the peg with respect to the slotted link is then:
[tex]v_r_e_l = v_P - v_OQ[/tex]
= 10 m/s - 26.2 m/s k
= -26.2 m/s k + 10 m/s b1
Step 2/3
To find the speed of the link's rotation, we can use the relationship between angular velocity and linear velocity for a rotating object:
[tex]v_O_Q = omega_O_Q x r_O_Q[/tex]
where r_OQ is the distance from point O to point Q on the slotted link.
The distance from point O to point Q on the slotted link is:
[tex]r_O_Q = \sqrt{[(2 m)^2 + (1 m)^2]} = 2.236 m[/tex]
The speed of the link's rotation is therefore:
[tex]v_O_Q = omega_O_Q x r_O_Q[/tex]
= (15 rad/s) x (2.236 m) x k
= 33.54 m/s k
Step 3/3
b. To find the peg's acceleration relative to the slotted link, we need to subtract the acceleration of the slotted link at point P from the acceleration of the peg at point P. The acceleration of the slotted link at point P can be found using the acceleration relationship for a slotted link:
[tex]a_O_Q = a_P + \alpha_O_Q * r_P_Q - \omega_OQ^2 * r_PQ[/tex]
where a_OQ is the acceleration of point Q on the slotted link, alpha_OQ is the angular acceleration of the slotted link, and all other terms are as previously defined.
At the instant shown in the diagram, the slotted link is rotating counterclockwise with an angular acceleration of:
[tex]\alpha_O_Q = d^2(\theta)/dt^2 = 0[/tex]
Since the angular acceleration is zero, the third term in the acceleration equation for the slotted link is also zero.
The distance from point P to point Q on the slotted link is as previously calculated:
[tex]r_P_Q = \sqrt{ [(0.9 m)^2 + (0.6 m)^2]} = 1.08 m[/tex]
The acceleration of the slotted link at point P is therefore:
[tex]a_O_Q = a_P + \alpha_O_Q x r_P_Q - \omega_O_Q^[/tex]
Therefore,
a)The speed of the link's rotation is therefore:v_OQ = 33.54 m/s k
b)The acceleration of the slotted link at point P is therefore:
a_OQ = a_P + alpha_OQ x r_PQ - omega_OQ
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determine the maximum axial force that can be applied so as not to exceed an allowable stress of 150 mpa. assume the length of the larger portion of the bar is 300 mm.
The maximum force is determined by multiplying the allowable stress (150 MPa) by the area of the larger portion of the bar (π × 0.152) and dividing by 4 is 11.3 kN.
To determine the maximum axial force that can be applied so as not to exceed the allowable stress of 150 MPa, the following formula should be used: Force = Stress × Area. In this case, the Area is the cross-sectional area of the larger portion of the bar, which has a length of 300 mm. Therefore, the maximum Force (F) can be calculated as follows: F = 150 MPa × (π × 0.152) / 4, where 0.15 is the radius of the larger portion of the bar (half the length of 300 mm). The result is F = 11.3 kN.
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explain what happened to the pump rate when you increased the stroke volume? why do you think this occurred? how well did the results compare with your prediction
All other factors being equal, increasing the stroke volume in a pumping system would normally result in raising the pump rate.
How can the flow rate of a pump be increased?It implies to increase the head of the pump while decreasing the length of the pumping system pipe and to increase the flowrate of the centrifugal pump while lengthening the pipe.
What happened to the flow rate when you increased the pressure?While increasing pressure alters the fluid's velocity, it also reduces flow or output. The volumetric efficiency of the pump and the slower motor speed are the two causes of the flow reduction.
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In the Powerball game, five different numbers between 1 and 59 will be drawn in succession, and then one number (the Powerball number) between 1 and 35 will be drawn. The player marks five different numbers between 1 and 59 and one number between 1 and 35 on a game card.a. What is the size of the sample space?b. What is the probability of matching all five numbers in any order plus matching the Powerball number?c. What is the probability of matching none of the five numbers but matching the Powerball number?
For letter a, we find that the sample space size is 175,223,510. For letter b the probability is 1 in 175,223,510. And for the letter c, the probability of hitting the Powerball number is 1 in 5,006,386.
How to calculate the probability?For the letter a, we need to find the total number of ways to pick five numbers from 1 to 59 and then multiply that by the number of choices for the Powerball number. Using the combination formula, we get:
C(59.5)x35 = 5,006,386x35 = 175,223,510As for the letter b, the probability of matching all five numbers in any order plus hitting the Powerball number can be calculated by dividing the number of ways to win by the size of the sample space:
1/175,223,510 ≈ 0.0000006 or 1 in 175,223,510And for the letter c, the probability of picking none of the five numbers but hitting the Powerball number is the probability of picking a number between 1 and 35 correctly and not picking any of the five numbers between 1 and 59. The number of ways to do this is:
C(59.0)xC(35.1) = 1x35 = 35Therefore, the probability of matching none of the five numbers but matching the Powerball number is:
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1. Write a Python script to save the dictionary words in the 'wordlist.txt' file, and then compress it to a zipfile with a protected password. Show your code and your output please, thank you.2. Write a Python script to perform brute force to extract the password protected zip file from Q1. Thepassword is believed to be associated with one of the dictionary words in the 'wordlist.txt file. Show yourcode and your output please, thank you.
The "wordlist.zip" zip archive is created using this script, which also adds each word from the "wordlist.txt" file as a distinct file. To prevent compression, the compression type is set to ZIP STORED.
How can I use Python to produce a password-protected zip file?The "default password to extract encrypted files" is set using setpassword. The documentation states at the very top: "It presently cannot produce an encrypted file, but it supports decryption of encrypted data in ZIP packages." Try using a software like pyminizip to build a ZIP file that is password-protected.
open a zip file
# Change the dictionary file's name to "wordlist.txt" in the dictionary file setting.
# Set the output zip file's name to "wordlist.zip" in the output zip file setting.
# Change the zip file's password to zip password = "mysecret"
# Use zipfile to create a new zip file that is password-protected.
Using ZipFile(output zip file, mode="w", compression="zipfile.ZIP DEFLATED," allowZip64="True") as myzip
# Use open(dictionary file, "r") as f: for line in f: to open the dictionary file and read its contents line by line.
# Append every word as a separate file, without compression, to the zip file.
line.strip(), compress type=zipfile.ZIP STORED, myzip.writestr
Set a password for the zip file using the following command: myzip.setpassword(bytes(zip password, 'utf-8')).
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calculate poisson's ratio for a cast iron that has a modulus of elasticity e of 110 gpa and a modulus of rigidity g of 44 gpa
The Poisson's ratio for a cast iron with a modulus of elasticity (E) of 110 Gpa and a modulus of rigidity (G) of 44 Gpa is 0.42.
Poisson's ratio is the ratio of transverse strain to corresponding axial strain on a material stressed along one axis. The Poisson's ratio for a cast iron with a modulus of elasticity (E) of 110 Gpa and a modulus of rigidity (G) of 44 Gpa can be calculated as follows:
Poisson's ratio (ν) = (E/2G)-1
ν = (110/2(44))-1
ν = 0.42
Therefore, the answer from the above calculation is 0.42.
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estimate the average, maximum day and peak hours water demand for a community of 55000population.
calculate the design water capacity of the water distribution system and the water treatment plant assume average water demand of 170lcpd
The combined design water capacity of the water treatment facility and distribution system should be 19,221,000 litres per day.
What is the equation for the highest daily demand?Maximum Day Demand (MDD) x 1.80 W3-01.3 System Parameters = Peak Hour Demand (PHD). A. Average Day Demand (ADD) multiplied by 2.25 to get Maximum Day Demand (MDD).
Average water demand = Population x Average water demand per capita
Average water demand = 55,000 x 170 liters per capita per day
Average water demand = 9,350,000 liters per day
Maximum day water demand = 1.5 x 9,350,000 liters per day
Maximum day water demand = 14,025,000 liters per day
Peak hour water demand = 170 liters per capita per day x 55,000 people x 2 / 24 hours x 4 peak hours
Peak hour water demand = 9,067 liters per hour
Fire demand = 3 liters per second x 60 seconds per minute x 24 hours
Fire demand = 5,400 liters per day
Design water capacity = 14,025,000 liters per day + 5,400 liters per day + (0.2 x 9,350,000 liters per day)
Design water capacity = 19,221,000 liters per day
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a slip lineation on a fault plane has a rake of 68 ne. the fault is oriented n52e,83se. what is the plunge and bearing of this lineation
The plunge and bearing of the lineation are 248° and 315.5°NW, respectively
The slip lineation on the fault plane has a rake of 68° NE. Rake is the angle between the strike of the lineation and the fault. The fault is oriented N52°E and 83°SE. To calculate the plunge and bearing of the lineation, first, calculate the fault plane normal vector:
Fault plane normal vector = N52°E + 83°SE = 135.5°SE
Next, calculate the plunge and bearing of the lineation by taking the rake of the lineation and adding 180° to it.
Plunge = (68° + 180°) = 248°
Bearing = (135.5°SE + 180°) = 315.5°NW
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explain how this relates to the value of the magnitude response of a first-order low-pass filter at its cutoff frequency.
The magnitude response of a first-order low-pass filter at its cutoff frequency is determined by the ratio of the output resistance to the input resistance.
The magnitude response of a first-order low-pass filter at its cutoff frequency is determined by its transfer function. The magnitude response is determined by the ratio of the magnitude of the output to the magnitude of the input. At the cutoff frequency, the magnitude response is equal to the square root of the ratio of the output resistance to the input resistance.
There is a filter there is what is called the cut off frequency, where this frequency is the frequency that is the limit for passing or blocking the input signal which has a higher frequency or a lower frequency than the cutoff frequency.
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Of the following refrigerants, which has the lowest global warming potential (GWP)?
The refrigerants, which has the lowest global warming potential (GWP) is R-717. So, option A is correct.
GWP stands for Global Warming Potential. It is a measure of how much a given amount of a greenhouse gas, such as carbon dioxide or methane, will contribute to global warming over a specified time period, usually 100 years. The GWP of a greenhouse gas is calculated by comparing the amount of heat trapped by the gas to the amount of heat trapped by an equivalent mass of carbon dioxide over the same time period.
There are numerous other low-GWP refrigerants out there, that means you as an HVAC expert need to don't have any trouble locating one proper for the packages you address.
Global warming potential (GWP) can vary substantially in not handiest greenhouse gases, however refrigerants. a few refrigerants will have a global warming potential as excessive as eight,000, because of this one ton of the refrigerant gas traps as tons heat over a given time period as 8,000 heaps of carbon dioxide.
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The complete question is:
Which of the following refrigerants, which has the lowest global warming potential (GWP)?
A) R-717
B) R-719
C) R-625
D) R-392
refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.14 mpa, and leaves as superheated vapor at 0.8 mpa and 608c at a rate of 0.06 kg/s. determine the rates of energy
The rate of energy that refrigerant-134a enters the compressor of a refrigeration system as saturated vapor at 0.14 mpa, and leaves as superheated vapor at 0.8 mpa and 608c at a rate of 0.06 kg/s is thus 24.072 kJ/s.
First, we need to calculate the enthalpy of saturated vapor at 0.14 mpa. This can be found in a vapor table. The enthalpy of saturated vapor at 0.14 mpa is 272.6 kJ/kg. Next, we need to calculate the enthalpy of superheated vapor at 0.8 mpa and 608C. Again, this can be found in a vapor table. The enthalpy of superheated vapor at 0.8 mpa and 608C is 681.2 kJ/kg.
Now, we can calculate the rate of energy that refrigerant-134a enters the compressor of a refrigeration system. We calculate this by subtracting the enthalpy of saturated vapor (272.6 kJ/kg) from the enthalpy of superheated vapor (681.2 kJ/kg) and multiplying the difference by the rate of flow (0.06 kg/s). The rate of energy that refrigerant-134a enters the compressor of a refrigeration system is thus 24.072 kJ/s.
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A sheet of 3mm cast acrylic measures 600mmx1000mm, how many A2 pieces can be cut from this?
Answer:
2 pieces
Explanation:
You want to know the number of pieces 420 mm × 594 mm can be cut from a sheet that is 600 mm × 1000 mm.
DimensionsComparing the dimensions, we see that both dimensions of an A2 piece (420 mm, 594 mm) are shorter than the short dimension of the given sheet. However, the long dimension of the A2 piece will not fit twice in the long dimension of the cast sheet.
2 pieces of size A2 can be cut from the cast sheet.
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Additional comment
The pieces must be arranged so the long dimension of the A2 piece takes up most of the short dimension of the cast sheet.
The number can also be figured by comparing the areas, as in the attachment. The cast sheet has an area of about 2.4 times the area of an A2 piece.
a no start condition is being diagnosed on a vehicle with electronic fuel injection (efi) and distributorless ignition. technician a says you should only use a dmm (digital multimeter) to check voltage values on pcm (powertrain control module). technician b says you should use a tool to check for spark at one of the spark plugs. who is right?
Answer:
Technician A is correct. A DMM should be used to check voltage values on the PCM. A spark plug tester should be used to check for spark at one of the spark plugs.
(T/F ) when examining a portable case, a non-licensed user will not have access to file system explorer or registry explorer.
When examining a portable case, a non-licensed user will not have access to file system explorer or registry explorer. This statement is true.
What is a portable case?
Portable case is an all-in-one evidence collection system that can be easily transported to a remote location. They are commonly used by digital forensics specialists to collect evidence from digital devices in the field, such as laptops, desktop computers, and mobile phones. Portable cases can have software pre-installed on them to aid in the collection of evidence. These applications may include file system explorers, registry explorers, and other tools for analyzing digital evidence. Because these tools are proprietary, they must be licensed by the software vendor in order to be used.
A non-licensed user will not have access to these proprietary software tools, which includes file system explorers and registry explorers. Only licensed users who have been given the proper authorization to use these tools can access them when examining a portable case. Thus, the statement that a non-licensed user will not have access to file system explorer or registry explorer is true.
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when welding with the gtaw process on aluminum, what is a typical amount of the ac sine wave that will be spent cleaning the material?
When welding with the GTaw process on aluminum, a typical amount of the AC sine wave that should be spent cleaning the material is between 40 and 60%. This will help to ensure a clean and porosity-free weld.
The GTaw (Gas Tungsten Arc Welding) process is an arc welding technique that is commonly used on aluminum materials. When using this process, a typical amount of the AC sine wave that is used for cleaning the material is between 40 and 60%. This is because a lower amperage (around 40A) is used when cleaning the aluminum before welding. This is done to remove any oxide film that may have formed on the surface of the aluminum.
To clean the aluminum, the welder should first use a wire brush to remove any dirt, grease, and rust from the surface of the aluminum. Then the welder should set the current between 40 and 60% of the maximum current on the welding machine. This will help to remove any oxide film on the aluminum material that could cause porosity in the weld. Once the oxide is removed, the welder can increase the current to the recommended level for welding.
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