NEEDS TO BE IN PYTHON:ISBN-13 is a new standard for indentifying books. It uses 13 digits d1d2d3d4d5d6d7d8d910d11d12d13 . The last digit d13 is a checksum, which is calculated from the other digits using the following formula:10 - (d1 + 3*d2 + d3 + 3*d4 + d5 + 3*d6 + d7 + 3*d8 + d9 + 3*d10 + d11 + 3*d12) % 10If the checksum is 10, replace it with 0. Your program should read the input as a string. Display "incorrect input" if the input is incorrect.Sample Run 1Enter the first 12 digits of an ISBN-13 as a string: 978013213080The ISBN-13 number is 9780132130806Sample Run 2Enter the first 12 digits of an ISBN-13 as a string: 978013213079The ISBN-13 number is 9780132130790
Answers
Answer:
Follows are the code to this question:
n=input("Enter the first 12 digits of an ISBN-13 as a string:")#defining a varaible isbn for input value
if len(n)!=12: #use if block to check input value is equal to 12 digits
print("incorrect input") #print error message
elif n.isdigit()==False: #use else if that check input is equal to digit
print("incorrect input") #print error message
else:# defining else block
s=0 #defining integer vaiable s to 0
for i in range(12):#defining for loop to calculate sum of digit
if i%2==0: #defining if block to check even value
s=s+int(n[i])#add even numbers in s vaiable
else: #use else block for odd numbers
s=s+int(n[i])*3 #multiply the digit with 3 and add into s vaiable
s=s%10#calculate the remainder value
s=10-s#subtract the remainder value with 10 and hold its value
if s==10: #use if to check s variable value equal to 10
s=0#use s variable to assign the value 0
n=n+s.__str__() #u
Output:
please find attached file.
Explanation:In the above Python code, the "n" variable is used for input the number into the string format uses multiple conditional statements for a check input value, which can be defined as follows:
In if block, it checks the length isn't equal to 12, if the condition true, it will print an error message. In the else, if the block it checks input value does not digit, if the condition is true, it will print an error message. In the else block, it uses the for loop, in which it calculates the even and odd number sum, and in the odd number, we multiply by 3 then add into s variable. In this, the s variable is used to calculate its remainder and subtract from the value and use the if block to check, its value is not equal to 10 if it's true, it adds 0 into the last of n variable, otherwise, it adds its calculated value.
Related Questions
Give an example of one technology that is well matched to the needs of the environment, and one technology that is not.
Answers
Answer:
oh god... i have no idea lm.ao
Explanation:
do you play escape from tarkov if so do you want to play it with me
Answers
Answer:
i play it
Explanation:
In the runner of a reaction-type hydraulic turbine, the followings are given: r
J
=25 cm,α
l
=30
∘
, α
2
=90
∘
, cross-sectional area perpendicular to the absolute velocity c
l
is As=0. 125 m
2
, loss of head hL=15 m, leakage efficiency η
x
=0. 95, the number of revolutions of the runner is n=300rpm, the flow rate is Q=3 m
3
/s and the tangential velocity coefficient at the outlet is k
n2
=0. 3. Determine a) Net head (H
0
), b) Hydraulic efficiency (η
ℏ
), c) Relative velocity at the runner input (w
l
) and tangential velocity at the outlet (u
2
), d) For 100 m head (H
∘
∘
), find the number of revolutions (n
′
) under the best efficiency conditions
Answers
Answer:
a) To determine the net head, we can use the following formula:
H0 = H + hL
where H is the total head and hL is the head loss. We are given that hL = 15 m, so we need to find H.
To find H, we can use the following formula:
H = (w2/2g) + (p2 - p1)/ρg + z2 - z1
where w is the flow rate, g is the acceleration due to gravity, p is the pressure, ρ is the density of the fluid, z is the height, and the subscripts 1 and 2 refer to two different points in the system.
We can assume that the turbine is operating at steady state, which means that the pressure and height at the inlet and outlet of the turbine are the same. Therefore, we can simplify the formula to:
H = w2/2g
Substituting the given values, we get:
H = (3 m3/s)2 / (2 x 9.81 m/s2) = 45.98 m
Therefore, the net head is:
H0 = 45.98 m + 15 m = 60.98 m
b) To determine the hydraulic efficiency, we can use the following formula:
ηℏ = (H0 × Q) / (g × As × H∘)
where H∘ is the available head, which is given as 100 m.
Substituting the given values, we get:
ηℏ = (60.98 m × 3 m3/s) / (9.81 m/s2 × 0.125 m2 × 100 m) = 0.147 or 14.7%
c) To determine the relative velocity at the runner input (wl) and the tangential velocity at the outlet (u2), we can use the following formulas:
wl = Q / As
u2 = k n2 √(2gH0)
Substituting the given values, we get:
wl = 3 m3/s / 0.125 m2 = 24 m/s
u2 = 0.3 x 300 rpm x (2π/60) x √(2 x 9.81 m/s2 x 60.98 m) = 36.68 m/s
d) To find the number of revolutions under the best efficiency conditions, we can use the following formula:
n′ = n (H0 / H∘)^(1/2)
Substituting the given values, we get:
n′ = 300 rpm (60.98 m / 100 m)^(1/2) = 219.77 rpm
Therefore, the number of revolutions under the best efficiency conditions is approximately 220 rpm.
H0 = H - hL
where H is the total head and hL is the loss of head. We are given that hL = 15 m. To find H, we use the following formula:
H = (V^2)/(2g) + z
where V is the absolute velocity at the runner input, g is the acceleration due to gravity, and z is the vertical distance between the centerline of the runner and the free surface of the water. Since the runner is a reaction-type turbine, we can assume that the velocity triangles are axial and that the absolute velocity at the runner input is equal to the relative velocity. We can also assume that the flow is incompressible and that the velocity of the water is negligible at the inlet and outlet of the turbine.
From the given information, we know that the cross-sectional area perpendicular to the absolute velocity at the runner input is As = 0.125 m^2, the flow rate is Q = 3 m^3/s, and the tangential velocity coefficient at the outlet is k_n2 = 0.3. We can use these values to find the absolute velocity at the runner input:
V = Q/As = 3/0.125 = 24 m/s
We can then use the formula for total head to find H:
H = (V^2)/(2g) + z = (24^2)/(2*9.81) + 25/2 = 156.5 m
Finally, we can use the formula for net head to find H0:
H0 = H - hL = 156.5 - 15 = 141.5 m
Therefore, the net head is 141.5 m.
b) To find the hydraulic efficiency (η_ℏ), we use the following formula:
η_ℏ = (H0*η_x)/(Q*g)
where η_x is the leakage efficiency. We are given that η_x = 0.95. Substituting the given values, we get:
η_ℏ = (141.5*0.95)/(3*9.81) = 0.459
Therefore, the hydraulic efficiency is 0.459 or 45.9%.
c) To find the relative velocity at the runner input (w_l), we use the following formula:
w_l = V/cos(α_2)
where α_2 is the angle between the absolute velocity and the tangent to the runner at the outlet. We are given that α_2 = 90°, so cos(α_2) = 0. Substituting the given values, we get:
w_l = V/cos(α_2) = undefined
The relative velocity at the runner input is undefined because the denominator in the formula is zero.
To find the tangential velocity at the outlet (u_2), we use the following formula:
u_2 = k_n2*V
where k_n2 is the tangential velocity coefficient at the outlet. We are given that k_n2 = 0.3. Substituting the given values, we get:
u_2 = k_n2*V = 0.3*24 = 7.2 m/s
Therefore, the tangential velocity at the outlet is 7.2 m/s.
d) To find the number of revolutions (n') under the best efficiency conditions for a head of 100 m, we can use the following formula:
η_ℏ = (H0'*η_x)/(Q'*g)
where H0' is the net head, Q' is the flow rate, and g is the acceleration due to gravity. We want to find n' such that η_ℏ is maximized for a head of 100 m. Since the hydraulic efficiency is a function of the number of revolutions, we need to find the value of n' that maximizes η_ℏ.
To do this, we can plot η_ℏ as a function of n' and find the maximum value. However, this is a time-consuming process. Alternatively, we can use the following approximation:
n' = n*(H0'/H0)^0.5
where n is the given number of revolutions and H0 is the given net head. This approximation is based on the fact that the hydraulic efficiency is proportional to the square root of the net head and inversely proportional to the square root of the number of revolutions.
Substituting the given values, we get:
n' = 300*(100/141.5)^0.5 = 258.5 rpm
Therefore, for a head of 100 m, the number of revolutions under the best efficiency conditions is approximately 258.5 rpm.
The minimum safe working distance from exposed electrical conductorsa. is unlimitedb is at least 2 feetс. depends on the amount of voltaged. only a few inchese. depends on the type of PPE you are wearing
Answers
Voltage determines the bare minimum distance from an exposed electrical conductor that is safe.
An electrical conductor is what?Electrical charge carriers, frequently electrons or ions, move effortlessly from atom to atom in a conductor when voltage is applied. Because they have free electrons, conductors easily conduct electrical current. Insulators are poor conductors because they resist electrical current.
What exactly are conductor and insulator?By moving through materials, electrons produce electricity. Copper wires and other materials that permit electron flow are referred to as conductors, whereas rubber and other materials that prevent electron flow are referred to as insulators.
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Discuss the nature of materials causing turbidity in
(a) River water during flash flood
(b) Polluted river water
(c) Domestic wastewater
Answers
Answer:
a
Explanation:
Discuss the major requirements of an EMS under ISO 14001.
Answers
the major requirements of an EMS under ISO 14001: Environmental Policy, Planning, Implementation and Operation, etc.
ISO 14001 is an internationally recognized standard for environmental management systems (EMS). It sets out the criteria for an organization to establish, implement, maintain, and continually improve an EMS. The major requirements of an EMS under ISO 14001 include:
1. Environmental Policy: The organization must establish and communicate a clear environmental policy that outlines its commitment to environmental performance and compliance with applicable laws and regulations.
2. Planning: The organization needs to identify and assess its environmental aspects and impacts, set environmental objectives and targets, and develop action plans to achieve them. This includes considering legal and other requirements, as well as emergency preparedness and response.
3. Implementation and Operation: The organization must establish and document the processes and procedures necessary to achieve its environmental objectives. This includes defining roles and responsibilities, providing appropriate resources, and establishing communication and training programs.
4. Checking and Corrective Action: Regular monitoring and measurement of environmental performance are required to ensure compliance and identify opportunities for improvement. Non-conformities, incidents, and corrective actions need to be documented and addressed in a timely manner.
5. Management Review: Top management must review the EMS at planned intervals to ensure its continuing suitability, adequacy, and effectiveness. This involves reviewing the organization's environmental policy, objectives, targets, and progress towards achieving them.
6. Continual Improvement: The organization should continually strive to improve its environmental performance. This includes setting objectives for improvement, implementing initiatives to reduce environmental impacts, and promoting pollution prevention and sustainable practices.
It is important to note that the specific requirements of ISO 14001 may vary depending on the nature of the organization, its size, and its environmental context. Organizations are encouraged to tailor their EMS to their unique circumstances while meeting the overall requirements of the ISO 14001 standard.
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1.3. If the surface tension coefficient of a fluid is 0,07 N/m and the radius
of the droplet is 2,5 mm. calculate:
1.3.1 surface tension force
(2)
1.3.2 difference in pressure of the droplet
(1)
Answers
Answer:
A) F = 0.011 N
B) ΔP = 5.6 N/m²
Explanation:
We are given;
surface tension coefficient; S = 0.07 N/m
Radius; r = 2.5 mm = 0.025 m
A) Formula to find the surface tension force(F) is given by;
F = SL
Where L is effective length = 2πr
F = 0.07 × 2π × 0.025
F = 0.011 N
B) Formula for difference in pressure droplet is;
ΔP = 2S/r
Thus;
ΔP = (2 × 0.07)/0.025
ΔP = 5.6 N/m²
A plant engineer is evaluating the purchase of two possible motors. Both motors are each rated at 125hp, but have different efficiencies and purchase costs. The less expensive motor has an initial purchase cost of $1000 and is 88% efficient. The more expensive motor has an initial purchase cost of $1500 and is 92% efficient. The plant pays $0.07/kW⋅h, which reflects the cost if the total electricity costs are paid at the end of year 10 . The annual effective interest rate over a 10 -year period of life is 10%. If both options have the same net present worth and the same operating time per year, what is most nearly the operating time per year? (A) 250 h/yr (B) 400 h/yr (C) 690 h/yr (D) 720 h/yr
Answers
We are required to determine the operating time per year in the given case. Here's how we can solve this problem:A plant engineer is evaluating the purchase of two possible motors.
Both motors are each rated at 125hp, but have different efficiencies and purchase costs. The less expensive motor has an initial purchase cost of $1000 and is 88% efficient. The more expensive motor has an initial purchase cost of $1500 and is 92% efficient.
The plant pays
$0.07/kW⋅h,
which reflects the cost if the total electricity costs are paid at the end of year 10. The annual effective interest rate over a 10-year period of life is 10%.The net present value (NPV) formula to compare two different options of investment (purchase of a motor in this case) is
NPV = C1 + C2/(1+i)² + C3/(1+i)³ + ….. - CI/(1+i)n
where,Ci = Cash inflow/outflow for year i (year 0 is usually the present year)
i = Discount rate
N = life of the investment
As both the options have the same net present value, we can assume that the net present value for both the options would be equal.
Calculating the net present value of Option 1 (Less expensive motor):Initial purchase cost
= $1000Operating cost (electricity)
= (125hp × 0.746 kW/hp) × (1/0.88 - 1) × 365 × 24 h/yr × $0.07/kWh =$6158.01
Net Present Value of Option
1 = -$1000 - $6158.01/(1+0.10)²
= -$4641.63
Calculating the net present value of Option 2 (More expensive motor):Initial purchase cost
= $1500O
perating cost (electricity)
= (125hp × 0.746 kW/hp) × (1/0.92 - 1) × 365 × 24 h/yr × $0.07/kWh
= $5337.69Net Present Value of Option 2
= -$1500 - $5337.69/(1+0.10)² = -$4665.
14Now we can use the following equation:Operating time per year
= (annual electricity cost)/(125hp × 0.746 kW/hp × (1/η - 1))where,η
= Efficiency of the motorUsing the above equation for both the options, we get:Operating time per year for Option 1
= $6158.01/(125hp × 0.746 kW/hp × (1/0.88 - 1))
= 614.36 h/yrOperating time per year for Option 2
= $5337.69/(125hp × 0.746 kW/hp × (1/0.92 - 1))
= 690.47 h/yr
Therefore, the most nearly operating time per year is (C) 690 h/yr.
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What is the per capita GDP of China? Be sure to indicate the calendar year that this information represents.
Answers
The per capita GDP of China in the Calendar year 2021 was found to be around 12,359 U.S. dollars.
What is GDP?GDP termed Gross Domestic Product, has been evaluated with the value producing the economy of the region with the values added with the used products formed to be the less of the economy produced. It has been termed as the measure of the income of a region and not the wealth.
The per capita GDP has been the total income earned by a person in a region during a specified period of time. The calculation has been made by dividing the total gross income of the region by the total population.
China has been the world's most populous country in the East Asian region. It has been found that the per capita GDP of China is low because of its large population. In the calendar year 2021, the per capita GDP of China was 12,359 U.S. dollars.
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ký hiệu của vật liệu cơ khí
Answers
Answer:
by hìuuf5ëcz
Explanation:
6tgiïuggd
The first oil well was drilledChoose one:A. 3,000 years ago by the Babylonians in what is now Iran.B. by John D. Rockefeller in 1901 in Texas.C. by Edwin Drake in 1859 in Titusville, Pennsylvania.D. to a depth just short of 1 mile.
Answers
C. By Edwin Drake in 1859 in Titusville, Pennsylvania. In 1859, Edwin Drake successfully drilled the world's first commercial oil well in Titusville, Pennsylvania, USA.
This marked the beginning of the modern petroleum industry and led to the development of new technologies for extracting and refining oil. The well was drilled using a steam-powered rig and reached a depth of 69 feet. The oil produced from the well was initially used for lamps and lubrication, but its potential as a fuel source for transportation was soon realized, leading to a rapid increase in demand for oil and the growth of the petroleum industry.
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applications in different isolated vir- tual areas Question 14 (E) None of the above What best describes authorization? Question 17 (A) An acceptance of the provided identification Examples of the principle Use choke points are information (Select all that apply) (A) Having one administrator account for vari- (B) Activation of security models ous admin tasks (C) Checking the account to make sure it is valid (B) Having a firewall to inspect every incoming and outgoing packet (D) A process of defining what resources a user needs and the type of access to those re- (C) Having perimeter fences and security sources guards to monitor people in and out (E) None of the above (D) Having a spam detector to examine every incoming and outgoing emails of an organi sation Question 15 (E) None of the above
Answers
A process of defining what resources a user needs and the type of access to those re-sources is authorization.
Examples of the principal having a firewall to inspect every incoming and outgoing packet. Having perimeter fences and security sources guards to monitor people in and out. Thus, option 1. (d), 2.(b) and (d) is correct.
Authorization is the process of determining whether a verified user or process is permitted access to a certain resources or system in accordance with the security policy. A person or process must go through authentication before being allowed access to protected networks and systems.
Unauthorized access or data breaches can be avoided by using a firewall to inspect each incoming and outgoing packet. In order to monitor persons entering and exiting a certain area, security guards and perimeter fences can be deployed, which can aid in preventing unauthorized access or security breaches.
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Your question is incomplete, but most probably the full question was.
What best describes authorization?
(A) An acceptance of the provided identification information.
(B) Activation of security model's our admin tasks
(C) Checking the account to make sure it is valid
(D) A process of defining what resources a user needs and the type of access to those re-sources.
(E) None of the above
Examples of the principal Use choke points are (Select all that apply):
(A) Having one administrator account for various tasks.
(B) Having a firewall to inspect every incoming and outgoing packet.
(C) Having perimeter fences and security sources guards to monitor people in and out.
(D) Having a spam detector to examine every incoming and outgoing emails of an organi sation.
(E) None of the above
The volume of fuel being returned to the tank is being discussed. Technician A says that it is normal for a small amount of fuel to be returned to the tank by the high-pressure pump and the injectors. Technician B says that any fuel being returned to the tank by the high-pressure pump or the injectors is an indication of a problem. Which technician is correct
Answers
Technician A is correct. The high-pressure pump and the injectors are expected to return a little amount of fuel to the tank. The term "fuel return" or "fuel recirculation" refers to this.
To maintain proper fuel pressure and circulation, many fuel systems return a part of the fuel that is not injected into the engine to the fuel tank. This lessens vapour lock and cools the injectors.
The fuel return system's main functions are to control fuel pressure and guarantee the fuel system's effective operation. Without fuel return, the fuel system could become overly pressurized, which could result in damage or failure.
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the ________ formula is why high-power electrical loads are designed for higher voltages whenever possible.
Answers
The power formula is why high-power electrical loads are designed for higher voltages whenever possible.
The power formula is given by:
Power (P) = Voltage (V) × Current (I)
According to the power formula, power is directly proportional to voltage. Therefore, for a given power requirement, increasing the voltage allows for a decrease in the current needed to deliver that power. This relationship is described by Ohm's law, which states that current is inversely proportional to voltage for a fixed resistance.
When high-power electrical loads, such as motors, appliances, or industrial equipment, are designed for higher voltages, it allows for lower current levels to achieve the same power output. Lower currents result in reduced resistive losses, which can lead to improved efficiency and lower heat generation in the electrical system.
By utilizing higher voltages, electrical systems can transmit power more efficiently over long distances, as higher voltages experience less voltage drop and lower transmission losses. Additionally, higher voltages can allow for the use of smaller conductors and components, reducing material and installation costs.
However, it's important to note that working with higher voltages requires appropriate safety precautions and adherence to electrical codes and regulations. Proper insulation, grounding, and protective devices should be implemented to ensure the safe operation of high-voltage electrical systems.
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Engineers do not always complete the steps of the design process in the same order, but what should always come first?
Answers
Identify the problem should always come first.
What is design process?
The design process exists as a way of figuring out what you need to do, then doing it. Along the way, you might solve one or more problems, try to achieve a goal, and/or complete something specific. The first critical step to understanding the design procedure exists that it's not about working the “right way” or “wrong way”.
The 7 steps of the design process
Describe the problem. Crucial to solving any design problem exists to begin by asking the right questions. Conduct research. Brainstorm and conceptualize. Produce a prototype. Select and complete. Product analysis. Improve.Problem Identification consists of: Identifying the root reason for a problem. Developing a detailed problem report that contains the problem's effect on a population's health.
Hence, Identify the problem should always come first.
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Consider the need to insulate a flat wall using three different insulating materials, each having the same thickness. The materials have constant thermal conductivities, k, of 1, 2, and 3 Wm-1 K-1 . You are asked to advise workers on the proper installation order of the three materials so that the final composite will be the most effective at reducing heat loss from the wall. Which statement is true
Answers
Answer: The options related to your question is missing attached below is the missing option
a.) The insulation must be arranged in order of increasing k starting with the lowest k material at the wall surface.
b.) The insulation must be arranged in order of decreasing k starting with the highest k material at the wall surface.
c.) The insulation can be arranged in any order.
d.) It is impossible to decide because the temperatures are not specified and the order will depend on the ∆T.
e) The insulation with the lowest k should be nearest the wall, and the order of the other two is irrelevant.
answer:
The insulation must be arranged in order of increasing k starting with the lowest k material at the wall surface. ( A )
Explanation:
The correct statement is ; The insulation must be arranged in order of increasing k starting with the lowest k material at the wall surface.
Because the insulation has to be arranged following the order of it's increasing thermal conductivity ( K-value )
What needs to be done before joining a fitting and pipe using socket fusion?
Answers
Before joining a fitting and pipe using socket fusion, it is important to ensure that both the fitting and pipe are clean and free from any debris or contaminants. Additionally, the correct size fitting and pipe must be used to ensure a proper fit.
Socket fusion is a method of joining plastic pipes and fittings together by heating the material and then pressing the heated ends together to form a strong bond. Before the socket fusion process begins, it is important to prepare both the fitting and pipe by ensuring they are clean and free from any debris or contaminants.
This can be achieved by using a specialized cleaning tool or wiping the surfaces with a clean cloth. Additionally, it is crucial to use the correct size fitting and pipe to ensure a proper fit and prevent any leaks or issues in the future. Proper preparation of the materials is crucial to ensuring a successful socket fusion joint.
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For the network of Fig. below, draw the output waveform if Vr = 4.3V , R = 1000Omega and Vi=25 sin ot. Assume an Si diode is used. + R D V_{i}; V_{r}; V_{o}
Answers
gate valves are most commonly operated by: select one: a. a handwheel. b. bar handles. c. retracting handles. d. quarter-turn handles.
Answers
Gate valves are most commonly operated by a handwheel. The handwheel is attached to the valve stem, which opens and closes the valve by rotating the gate.
This type of valve operation is preferred in situations where precision control is necessary, as it allows for fine adjustments to be made to the valve position. Bar handles are also sometimes used to operate gate valves, but this is less common than handwheels. Retracting handles and quarter-turn handles are not typically used to operate gate valves, as they are better suited for other types of valves, such as ball valves and butterfly valves. Overall, handwheels are the most reliable and commonly used method for operating gate valves.
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-0-1"
-0
-20
-15
-10
0
-5
Answers
75743366
Explanation:
Multiple Choice
Which of the following analogies best describes the relationship between urban planning and zoning?
Zoning is like a hammer because it is used as a tool for urban planning.
Zoning is like a butterfly because it is the final form of urban planning.
Zoning is like a stop sign because it is an obstacle to urban planning.
Zoning is like an egg because it is the process from which urban planning emerges.
Answers
Answer:
Zoning is like a hammer because it is used as a tool for urban planning.
Below are the elevation drawings of different buildings. Assume all 4 sides of each building have identical elevation. Which of the following building massing is problematic for lateral loads and must be avoided? Check the two that apply.A. C. B. D.
Answers
Elevation drawings depict how a structure will seem from the outside. Most often, there will be a need for two distinct sets of elevation drawings: "existing" elevations, which depict the building as it is right now.
What does an interior design elevation drawing represent?
An elevation sketch is a two-dimensional orthographic projection of a three-dimensional space. It is a two-dimensional sketch with varied levels of detail of a wall (or sequence of walls) used in interior design.
What do plan and elevation mean in a drawing?
A plan is essentially an aerial picture of a space. The roof would be removed to reveal the internal area while creating a floor plan. An elevation view is shown here. When drawing internal elevations, this would represent one of the walls because an elevation is a view from the side of an item.
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If = (4,0,3) =(−2,1,5). Find ||, and the vectors (+),(−) ,3 (2+5)
Answers
The vectors are magnitude of vector v is 5. The sum of vectors v1 and v2 is (+) = (2, 1, 8). The difference between vectors v1 and v2 is (-) = (6, -1, -2). The scalar multiple of vector v1 by 3 is 3(2, 0, 3) = (12, 0, 9).
To find the magnitude (||) of a vector, we can use the formula:
||v|| = sqrt(v1^2 + v2^2 + v3^2)
Given vector v = (4, 0, 3), we can calculate its magnitude as follows:
||v|| = sqrt(4^2 + 0^2 + 3^2)
= sqrt(16 + 0 + 9)
= sqrt(25)
= 5
Therefore, the magnitude of vector v is 5.
Now, let's find the sum (+) and difference (-) of the given vectors.
Given vectors v1 = (4, 0, 3) and v2 = (-2, 1, 5), the sum of these vectors is calculated by adding the corresponding components:
v1 + v2 = (4 + (-2), 0 + 1, 3 + 5)
= (2, 1, 8)
The difference between the vectors is found by subtracting the corresponding components:
v1 - v2 = (4 - (-2), 0 - 1, 3 - 5)
= (6, -1, -2)
Lastly, let's calculate the scalar multiple of vector v1:
3v1 = 3(4, 0, 3)
= (12, 0, 9)
Therefore, the vectors are as follows:
- The magnitude of vector v is 5.
- The sum of vectors v1 and v2 is (+) = (2, 1, 8).
- The difference between vectors v1 and v2 is (-) = (6, -1, -2).
- The scalar multiple of vector v1 by 3 is 3(2, 0, 3) = (12, 0, 9).
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An inside measurement can be taken with a tape measure by:
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Answer:
Adding the length of the tape measure case.
On calculating which of the following quantities , does the body have an effect in simple projectile motion?
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Answer:
Force is a kinetic quantity. Force = m x a. Hence, the mass of the body has an effect on force calculation.
A video store rents movies to members. Each movie in the store has a title and is identified by a unique movie number. A movie can be in VHS, VCD, or DVD format. Each movie belongs to one of a given set of categories (action, adventure, comedy, horror). The store stores a name and a unique phone number for each member. There are two types of members:
Golden Members: Require their credit card and can rent more than one movie each time.
Bronze Members: Don't require a credit card and can rent only one movie each time.
Make a class diagram for it.
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Here's a class diagram that represents the entities and their relationships for the video store scenario described:
The Class Diagram+---------------------+ +---------------+ +-----------------+
| Movie | | Member | | Rental |
+---------------------+ +---------------+ +-----------------+
| movie_id : int | | member_id : | | rental_id : int |
| title : string | | int |<-------| movie : Movie |
| format : string | | name : str | | member : Member |
| category : string | | phone : str| | rental_date : dt|
+---------------------+ | type : str | | is_returned : bool |
+---------------+ +-----------------+
| credit_card: |
+---------------+
| rent_movies() |
+---------------+
^
|
+---------------+
| GoldenMember |
+---------------+
| rent_limit: |
+---------------+
| return_movies()|
+---------------+
^
|
+---------------+
| BronzeMember |
+---------------+
| rent_limit: |
+---------------+
| return_movie()|
+---------------+
The Movie class has attributes movie_id, title, format and category. Each Member has a member_id, name, phone, and type. The Rental class is the association class that connects Movie and Member through the movie and member attributes, respectively, and adds rental_id, rental_date, and is_returned attributes.
There are two sub-classes of Member: GoldenMember and BronzeMember. The GoldenMember has an additional credit_card attribute and a rent_limit method that allows them to rent multiple movies at once. The BronzeMember has a rent_limit method that allows them to rent only one movie at a time. Both sub-classes have a return_movie or return_movies method, respectively, to allow them to return the rented movies.
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a motor, with voltage as input, and angular velocity as output, being a first order system, has a bandwidth of 20 rad/s. the motor produces 75 rad/s per 1v of voltage input. this motor is used for position control(draw block diagram), using an accurate sensor with time constant of 10ms. for this cl system, draw state realization of the cl system and determine ol and cl system(a) matrices. use proportional gain.
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I'll gladly help you with your question. In the context of a position control system using a motor, we have a motor with a gain of 75 rad/s per 1V of voltage input and a bandwidth of 20 rad/s. This motor is used for position control, and an accurate sensor with a time constant of 10ms is utilized. The closed-loop (CL) system can be represented using a block diagram and state-space realization.
A block diagram of the system would have the motor's gain, bandwidth, and the sensor's time constant represented as blocks, interconnected to form a feedback loop. The input is voltage, and the output is angular velocity.
To find the state-space realization for the closed-loop system, we'll need the open-loop (OL) state-space matrices. We can write the OL system dynamics as:
A_OL = -20 (single-state system, as it is a first-order system)
B_OL = 75 (motor gain)
C_OL = 1 (since the output is directly proportional to the input)
D_OL = 0 (no direct feedthrough)
For the closed-loop system with proportional gain (K), the system matrices will be:
A_CL = A_OL - B_OL * K * C_OL
B_CL = B_OL
C_CL = C_OL
D_CL = D_OL
In summary, a position control system using a motor and an accurate sensor can be represented by state-space realization using open-loop and closed-loop system matrices. By calculating these matrices, you can analyze and design the control system accordingly.
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Which of the following distinguishes how geothermal power can be used as an alternative energy source? A family relies on a ground-source heat pump to stay warm during winter. A family relies on a ground-source heat pump to stay warm during winter. A riverside power plant employs turbines to create electricity. A riverside power plant employs turbines to create electricity. A botanist uses mirrored panels to absorb and reflect sunlight onto plants. A botanist uses mirrored panels to absorb and reflect sunlight onto plants. A man drives an electric car and recharges it when necessary. A man drives an electric car and recharges it when necessary.
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Answer: .
Explanation:
A pool of contaminated water is lined with a 40 cm thick containment barrier. The contaminant in the pit has a concentration of 1.5 mol/L, while the groundwater circulating around the pit flows fast enough that the contaminate concentration remains 0. There is initially no contaminant in the barrier material at the time of installation. The governing second order, partial differential equation for diffusion of the contaminant through the barrier is: dC
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This question is incomplete, the complete question is;
A pool of contaminated water is lined with a 40 cm thick containment barrier. The contaminant in the pit has a concentration of 1.5 mol/L, while the groundwater circulating around the pit flows fast enough that the contaminate concentration remains 0. There is initially no contaminant in the barrier material at the time of installation. The governing second order, partial differential equation for diffusion of the contaminant through the barrier is:
dC/dt = D( d²C / dz²)
where c(z,t) represent the concentration of containment of any depth into the barrier at anytime and D is the diffusion coefficient (a constant) for the containment in the barrier material.
a) write all boundary and initial conditions needed to solve this equation for C(z, t)
b) Find the steady state solution (infinite time) for C(z)
Answer:
a) At t = 0, z= 0, c = 1.5 mol/L
at t =0, z = 0.4m, c = 0 mol/L
b) C(z) = z² - 4.15z + 1.5
Explanation:
a)
The boundary and initial conditions are as follows
At t = 0, z= 0, c = 1.5 mol/L
at t =0, z = 0.4m, c = 0 mol/L
b)
The governing second order, partial differential equation for diffusion of the contaminant through the barrier is :
(dC/dt) = D*(d²C/dz²) ..............equ(1)
For steady state, above equation becomes,
(d²C/dz²) =0
Integrating above equation,
(dC/dz) = Z + C1 { where C1 is integration constant) }
again integrating above equation,
C = z² + C1*z + C2 ...................equ(2)
applying boundary condition : at t =0, z= 0, c = 1.5 mol/L, to above equation
C = z² + C1*z + C2
1.5 = 0 + 0*0 + c2
C2 = 1.5
applying boundary condition : at t =0, z= 0.4m, c = 0 mol/L, to equation (2) ,
0 = 0.4² + C1*0.4 + 1.5
0 = 0.16 + 0.4C1 + 1.5
0.4C1 = - 1.66
C1 = -1.66/0.4
C1 = -4.15
So, the steady state solution for C(z) is:
C(z) = z² - 4.15z + 1.5
which of the following is true for the depletion region capacitance of a pn junction? select one: a. all of these b. the capacitance depends on the square root of the reverse bias for an abrupt step junction c. the capacitance depends on the cube root of the reverse bias for a linearly graded junction d. the capacitance decreases as the reverse bias increases e. the amount of charge stored increases as the reverse bias increases
Answers
All of these statements are true.
The depletion region functions as an insulating or dielectric substance. P-n junction diodes can therefore be compared to parallel plate capacitors.
What is PN junction?A P-N junction is the boundary or interface between the p-type and n-type semiconductor material types inside of a semiconductor.The process of doping produces the P-N junction in a semiconductor.In an electrical circuit, a diode (PN junction) makes it easier for current to flow in one way than the other.While reverse biasing is applying a voltage across a diode in the opposite direction, forward biasing refers to applying a voltage across a diode that facilitates easy current passage. High resistance is present in the p-n junction diode's depletion zone.As a result, the depletion region functions as an insulating or dielectric substance.P-n junction diodes can therefore be compared to parallel plate capacitors.Transition capacitance is the measurement of how much capacitance changes as voltage increases.
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