Identify 10 top level functions for this software system and draw a FFBD for this system using the identified functions. (15)
Answers
The top-level functions for the software system are:
1. User authentication and access control
2. Data input and validation
3. Data storage and retrieval
4. Data processing and analysis
5. Reporting and visualization
6. Communication and collaboration
7. System configuration and customization
8. Error handling and logging
9. Integration with external systems
10. System maintenance and updates.
1. User authentication and access control: This function manages user authentication and ensures that only authorized users can access the system, protecting sensitive data and maintaining security.
2. Data input and validation: This function allows users to input data into the system and validates the input to ensure accuracy and integrity.
3. Data storage and retrieval: This function handles the storage and retrieval of data, ensuring efficient and reliable data management.
4. Data processing and analysis: This function processes and analyzes the data, performing calculations, transformations, and generating insights or results.
5. Reporting and visualization: This function generates reports and visual representations of data to facilitate understanding and decision-making.
6. Communication and collaboration: This function enables communication and collaboration between system users, allowing them to share information, exchange messages, and work together.
7. System configuration and customization: This function allows administrators or users to configure and customize the system based on their specific requirements.
8. Error handling and logging: This function handles errors and exceptions that may occur during system operation, providing appropriate feedback to users and logging errors for debugging and troubleshooting.
9. Integration with external systems: This function facilitates integration with external systems, such as APIs or third-party applications, enabling data exchange and interoperability.
10. System maintenance and updates: This function includes tasks related to system maintenance, such as backups, performance monitoring, bug fixes, and updates to ensure the system's smooth operation and continuous improvement.
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Related Questions
Pacemakers designed for long-term use commonly employ lithium-iodine batteries that are capable of supplying 0.42 A⋅h of charge.
a. How many coulombs of charge can such a battery supply?
b. If the typical current produced by the pacemaker is 5.6 μA, what is the expected lifetime of the device?
Answers
The movement of electrons is current. This battery will be capable of delivering 1,512 C of charge.
The flow of electron-deficient atoms, or electrons, is what is known as current. I is used to symbolise it. Moreover, one column of electrical charge is equal to one ampere, the SI unit of current.
Current, I₀ = 0.42A⋅h
current that the pacemaker generates , I₁ = 5.6μA = 5.6 x 10⁻⁶ A
A.) The relation, which may be used to calculate the number of coulombs the battery can produce,
Q= I x T
Q = 0.42 x 3600
Q = 1,512 C
Hence, this battery will be able to deliver 1,512 C of charge.
B.) As the charge was previously discussed using the same relationship,
Q= I xT
When we are aware of the current and charge the battery and pacemaker create,
1512 = 5.6 x \(10^{-6}\) x t
t = 2.7 x \(10^{-4}\) sec
As a result, the device should last 2.7 x \(10^{-4}\) sec.
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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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World Without Engines: Explain what todays world without engines would be like? How would it change your life? The world? The way we do things? Please write in paragraph format and include introduction, body, and conclusion. DON'T ANSWER UNLESS YOU HAVE THE ANSWER!!!!!!!!! I WILL MARK BRAINLYEST
Answers
Answer:
the world will not be the same it will change dramticily and
things will not be the same
Explanation:
Given the following MATLAB statement: ( 3 + 2 ) / 5 * 4 + 5 ^ 2 In what order will these operations be done?
Answers
Answer:
first is the parentheses, (3+2)=5 next is the exponent 5^2=25, next is the division 5 / 5 = 1, then the multiplication 4*1=4 and then you add 4+25=29. so the answer is 29.
Which of the following is false about most machine learning models?
They require numbers or collections of numbers as input.
They are flexible enough to handle all issues you might see in your dataset (lack of data, incorrect data, etc)
They are trained by iteratively adjusting their parameters to minimize a loss function.
Once trained, their model parameters can be used to make new predictions in a process called a “model inference algorithm.”
Answers
The false statement about most machine learning models is that: B. they are flexible enough to handle all issues you might see in your dataset (lack of data, incorrect data, etc).
What is machine learning?Machine learning (ML) is also referred to as deep learning or artificial intelligence (AI) and it can be defined as a subfield in computer science which is typically focused on the use of data-driven techniques (methods), computer algorithms, and technologies to develop a smart computer-controlled robot with an ability to automatically perform and manage tasks that are exclusively meant for humans or solved by using human intelligence.
Generally speaking, machine learning models are designed and developed to accept numerical data (numbers) or collections of numerical data (numbers) as an input.
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The pistons in an engine show how gas behavior can be applied to everyday events. Volume, temperature, and pressure of a gas are all involved in the working pistons. How are these factors related in pistons according to the Boyle's law?
Answers
According to Boyle's law, the piston rises, and these two factors—increasing pressure and decreasing volume—are associated in pistons.
Boyle's law, also known as the Boyle-Mariotte law or Mariotte's law, describes the relationship between the volume and pressure of a confined gas (especially in France). Boyle's law states that in a closed system with constant temperature and gas volume, the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it fills. PV = k is the algebraic expression for Boyle's law. Volume times pressure equals some constant, which is identical to some constant k, where k is a constant, P is the gas's pressure, and V is the gas's volume. According to Boyle's Law,
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A "calorie" is a unit of energy, defined as the amount of energy needed to raise the temperature of one gram of water by one degree Celsius. The nutritional labels on food products typically tell you how many calories of digestible energy are in one serving of food, where "digestible" means that the energy stored in the chemical bonds of the molecules comprising the food can be extracted by your body. (Water for example has energy, but that energy is not chemically accessible via digestion.) To simplify understanding for typical consumers, the "calories" reported on nutritional labels actually represent kilocalories: a 170 calorie can of beer actually contains 170,000 calories of digestible energy.
i) If a student foolishly decides to binge drink 21 beers on their 21t birthday, how many gallons of water could they have heated from room temperature (24 °C) to boiling (100 C) using an equivalent amount of digestible energy in the beer? Recall that one gallon of water is roughly 8 pounds.
ii) What is this energy equivalent to in BTU? A "BTU" or British Thermal Unit is also a unit of energy, defined as the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit
iii) If you had purchased an equivalent amount of electrical energy in kW-hr from the utility company, how much would you have to pay? Is this cheaper than buying beer?
Answers
A "calorie" is a unit of energy that is defined as the usually inform you of the number of calories of digestible energy present in one serving of food. 21 beers times 17 calories per beer equals 357 calories.
What is "calorie"?Calories are units of energy that a food or drink provides. You can usually find calorie counts listed on food items, and wearables like the best fitness trackers allow you monitor how many calories you're burning by doing different activities. Certain foods, such as fatty, fried, or processed foods, tend to have more calories. Other foods, such as fresh fruit and vegetables, tend to have fewer calories. However, some healthy fruits and vegetables can be high in calories, while low-calorie foods, such as diet soda, don’t provide any nutritional value. We need calories to give us enough energy to move around, stay warm, grow, work, think, and play. Even our blood circulation and digestion need the energy gained from calories in order to function well.To learn more about blood circulation refer to:
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who is the strongest avenger i say hulk but who knows at this point
Answers
Answer:
or is the strongest evenger she hulk
Explanation:
?????????
Answer:
Thor!
Explanation:
In Thor: Ragnarok he beat the Hulk in order for Hulk to win thor had to be electrocuted and in Avengers: Endgame Thor is seen holding open the "Floodgates" and withstanding the radiation from a dying star, also the fact that Thor is a god means that he is all powerful and the rightful heir to the throne to Asgard, plus the fact that he has defeated Loki multiple times a feat that not even the Hulk has done.
What is the attenuation in db for a 4th order low pass filter at a frequency of 10fc, where fc is the filter's corner frequency?
Answers
Fourth-order Low Pass Filter If the gain of both filters is set at 1.586, the voltage gain will be down 6 dB at the cutoff frequency. We can get a more flat response by choosing different values of voltage gain for both stages.
What is a fourth order low pass filter ?It is possible to create a 4th order low-pass filter with just one Op Amp. Due to the interconnected nature of all filter parameters, component tolerance sensitivity needs to be confirmed. The 4th order Sallen-Key topology is too sensitive to component tolerances, making it unsuitable for application.
Formula fc= 1/(2πRC).
How to calculate the attenuation of a low pass filter?The attenuation rate for a low-pass or high-pass filter will be -20 times the filter order, expressed in decibels per decade. A first-order filter, for instance, will attenuate at a rate of -20 dB/decade, but a fourth-order filter will attenuate at a rate of about -80 dB/decade.
Attenuation (dB)= 10 X log(PI/PO)
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Which of the following best describes the main function of UEFI?
implements the principal of least privilege when assigning permissions
backs up data in the case of a data breach
automatically locks the screen after a specified time of inactivity
manages the boot process
Answers
Explanation:
Manages the boot process.
A horizontal force P is applied to a 130 kN box resting on a 33 incline. The line of action of P passes through the center of gravity of the box. The box is 5m wide x 5m tall, and the coefficient of static friction between the box and the surface is u=0.15. Determine the smallest magnitude of the force P that will cause the box to slip or tip first. Specify what will happen first, slipping or tipping.
Answers
Answer:
SECTION LEARNING OBJECTIVES
By the end of this section, you will be able to do the following:
Distinguish between static friction and kinetic friction
Solve problems involving inclined planes
Section Key Terms
kinetic friction static friction
Static Friction and Kinetic Friction
Recall from the previous chapter that friction is a force that opposes motion, and is around us all the time. Friction allows us to move, which you have discovered if you have ever tried to walk on ice.
There are different types of friction—kinetic and static. Kinetic friction acts on an object in motion, while static friction acts on an object or system at rest. The maximum static friction is usually greater than the kinetic friction between the objects.
Imagine, for example, trying to slide a heavy crate across a concrete floor. You may push harder and harder on the crate and not move it at all. This means that the static friction responds to what you do—it increases to be equal to and in the opposite direction of your push. But if you finally push hard enough, the crate seems to slip suddenly and starts to move. Once in motion, it is easier to keep it in motion than it was to get it started because the kinetic friction force is less than the static friction force. If you were to add mass to the crate, (for example, by placing a box on top of it) you would need to push even harder to get it started and also to keep it moving. If, on the other hand, you oiled the concrete you would find it easier to get the crate started and keep it going.
Figure 5.33 shows how friction occurs at the interface between two objects. Magnifying these surfaces shows that they are rough on the microscopic level. So when you push to get an object moving (in this case, a crate), you must raise the object until it can skip along with just the tips of the surface hitting, break off the points, or do both. The harder the surfaces are pushed together (such as if another box is placed on the crate), the more force is needed to move them.
If your engine fails (completely shuts down) what should you do with your brake?
Answers
Answer:
take your foot off of the accelorator. do not brake and let the vehicle coast until it stops. put on your hazard lights as well
Explanation:
please help me solve this
Answers
Answer:
Following are the solution to this question:
Explanation:
\(\to \Sigma F_x = ma_x \\\\\to 3200 t^2 -440 (9.81) (\frac{8}{17}) = 440 (a) \\\\\to 3200 t^2 -2031.24 = 440 (a)\\\\\to a= 7.27t^2 -4.616\\\\\to dv=a.dt \\\\\to \int^{v}_{2} dv = \int^{2}_{0} (7.27t^2 -4.616) dt\\\\\to v-2 = 7.27 \frac{t^3}{3} - 4.616 t^{2}_{0}\\\\\to v-2 = 7.27 \frac{2^3}{3} - 4.616 {2} \\\\\to v-2 = 10.154\\\\\to v= 12.154 \ \frac{m}{s}\\\)
given string inputstr on one line and integer strindex on a second line, change the character at index strindex of inputstr to 'b'. ex: if the input is: eagle 0 then the output is: bagle note: assume the length of string inputstr is greater than strindex.
Answers
You can add code to the function Find Chars() that counts how many times the character "x" appears in the string "input String" and returns this count as the function's output.
In this version, each character in the string "input String" is iterated over using a for loop, and a conditional statement (if) is used to determine whether the current character is equal to "x." If so, one is added to the count. The function returns the final count as its output when the loop is finished. When called from the main function, this method should accurately count the number of times "x" appears in "input String" and return the result. You can add code to the function Find Chars() that counts how many times the character "x" appears in the string "input String" and returns this count as the function's output.
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as the angle of the ramp is increased the force parallel increases /decreases / remains the same
Answers
As the angle of the ramp is increased, the force parallel increases. Hence, option (a) can be considered as the correct answer.
When the angle of a ramp is increased, the force parallel to the ramp, also known as the parallel component of the gravitational force, does increase. This is because the component of gravity acting parallel to the ramp increases with the angle. However, it's important to note that the total gravitational force acting on an object remains constant regardless of the angle of the ramp.As the angle of the ramp increases, the force required to push or pull an object up the ramp against gravity increases. This is due to the increase in the vertical component of the gravitational force, which opposes the motion up the ramp. The parallel force required to overcome this increased vertical force also increases.
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how to solve kenergh maps
Answers
To solve kenergh maps, you will need to follow a series of steps to help you interpret and understand the information presented in the map.
1. Start by examining the key or legend on the kenergh map to understand the different colors, symbols, and shapes used to represent different features or data points.
2. Look at the labels and titles on the map to identify the location and scale of the map, as well as any other relevant information such as the time period or data source.
3. Analyze the patterns and trends shown on the map, paying attention to areas of high and low intensity, as well as any clusters or outliers.
4. Use additional resources such as charts, graphs, or data tables to supplement the information presented on the kenergh map, and to gain a deeper understanding of the underlying data and trends.
5. Finally, draw conclusions and make predictions based on your analysis of the kenergh map, and consider how this information can be applied to real-world situations or decision-making processes.
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Q1: Obtain the equivalent capacitance for the circuit of figure below between 1. Terminal a-c; 2. Terminal b-c; 3. Terminal c-d; a 4µF HH b [μF 2μF 3µF 6µF C 12μF HH d 8μF
Answers
1. The equivalent capacitance between terminals a-c is 2.4 μF
2. The equivalent capacitance between terminals b-c is 6μF
3. The equivalent capacitance between terminals c-d is 12 μF
What is a capacitance?Capacitance is the ability for a device to store charge
1. How to find the equivalent capacitance betwee terminals a-c?Given that the capacitance bewteen terminals a-c = a-b + b-c
Now, the capacitance between terminals b-c are in parallel.
So, for capacitances in parallel, we add their capacitances to get the equvalent capacitance.
So, the equivalent capapcitance between b-c is C = 1 μF + 2μF + 3µF = 6μF
Now C is in series with the capapcitance between terminals a-b.
Since they are in series, their equivalent capapcitance C' is
1/C' = 1/4μF + 1/C
= 1/4μF + 1/6μF
= (3 + 2)/12 μF
1/C' = 5/12 μF
C' = 12/5 μF
= 2.4 μF
So, the equivalent capacitance between terminals a-c is 2.4 μF
2. How to find the equivalent capacitance betwee terminals b-c?To find the equivalent capacitance between terminals b-c, we see that the capacitance between terminals b-c are in parallel.
So, for capacitances in parallel, we add their capacitances to get the equvalent capacitance.
So, the equivalent capapcitance between b-c is C = 1 μF + 2μF + 3µF = 6μF
So, the equivalent capacitance between terminals b-c is 6μF
3. How to find the equivalent capacitance betwee terminals c-d?Since there is only one capacitor between terminals c-d, the equivalent capacitance is equal to the value of that capacitor which is 12 μF
So, the equivalent capacitance between terminals c-d is 12 μF
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You are using a Jupyter Notebook to explore data in a DataFrame named productDF. You want to write some inline SQL by using the following code, and visualize the results as a scatter plot: %%sql SELECT cost, price FROM product What should you do before running a cell with the %%sql magic? a. Create a new DataFrame named product from productDF.select("cost", "price") b. Persist the productDF DataFrame using productDF.createOrReplaceTempView("product") c. Filter the productDF dataframe using productDF.filter("cost == price") d. Rename the columns in the productDF DataFrame using productDF.withColumnRenamed("cost", "price")
Answers
The development of various technologies led to many historic events. Use information from the Internet to describe one major historic event
initiated by a technological development or discovery
-
Sometimes, world events lead to the development of a technology. Perform online research and identify a historic event that required the
development of technologies. Discuss one technology created because of this event. How does it continue to affect human lives today?
Answers
Answer:
1. Industrial revolution was initiated or borne through the production of Steel
2. World War 1 led to the development of Tanks
Explanation:
The production of Steel through the Bessemer Process in the middle of the nineteenth century was a major technological development that spurred the Industrial revolution. This invention led to the widespread use of steel in the production of many things including vehicles and airplanes.
During the First World War in 1914, soldiers found the use of just their armaments in battle as not so productive. This led to the development of Tanks in 1915 that would continue moving towards the enemy even when being shot at.
A regulator is required on a nitrogen cylinder to
Answers
A regulator is required on a nitrogen cylinder in order to reduce very high pressure within the gas cylinder to a safer pressure.
What is a regulator?A regulator can be defined as a mechanical device that is designed and developed to ensure that a controlled amount of nitrogen gas is supplied from a gas cylinder.
This ultimately implies that, a regulator is required on a nitrogen cylinder in order to reduce very high pressure within the gas cylinder to a safer pressure.
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b) Discuss the recent trends in Production and operations management.
Answers
Explanation Operations management is an area of management concerned with designing and controlling the process of production and redesigning business operations in the production of goods or services.[1] It involves the responsibility of ensuring that business operations are efficient in terms of using as few resources as needed and effective in meeting customer requirements.
One of the three machines is having issues (the old one). The reliability of this machine is characterized by mean time between failures of 48 hours and a mean time to repair of 5 hours. Determine using the values from the previous problem:
(a) What is the machines availability?
(b) Taking into account the availability of the machine only for its operation time, determine its average hourly production rate.
(c) Since the machine is old I am limited to what I can do to it to improve its reliability. Suggest what I might do to keep up with the production quotas that Ford requires.
(d) The machine is from Germany and is metric. Unfortunately, all the wrenches we have in the plant are English system. To access the panel to make repairs, four 13 mm bolts must be removed. Will the 1/2 inch wrenches I supply my workers with work, or will I need to go one size larger? (e) Repair time could be reduced if I could lift the machine up with a forklift. My forklift is rated for one ton, but the German manufactured machine is rated at 1000 kg. Will the forklift work?
Answers
The machine's availability is calculated using the MTBF and MTTR values, while the average hourly production rate considers the machine's availability during its operation time.
How can the machine's availability and average hourly production rate be determined?(a) The machine's availability can be determined using the formula Availability = MTBF / (MTBF + MTTR). Substituting the given values, we can calculate the availability of the machine.
(b) To determine the average hourly production rate, we need to consider the machine's availability during its operation time. We can calculate the production rate by multiplying the machine's availability by the desired production rate.
(c) Since the machine is old and limited in terms of reliability improvements, some suggestions to meet Ford's production quotas could include optimizing maintenance schedules, implementing proactive maintenance practices, training operators to identify early signs of issues, and keeping critical spare parts readily available.
(d) To determine if the 1/2 inch wrenches will work for removing the 13 mm bolts, we need to convert inches to millimeters. If 1 inch is approximately equal to 25.4 mm, we can compare the sizes to see if the 1/2 inch wrench is compatible or if a larger size is needed.
(e) To determine if the forklift can lift the machine, we need to convert tons to kilograms. If 1 ton is equal to 1000 kilograms, we can compare the forklift's capacity of one ton to the weight of the German machine rated at 1000 kg to see if it falls within the forklift's lifting capacity.
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An engine cranks slowly. Technician A says a possible cause of the problem is low resistance in the starter circuit connections. Technician B says a possible cause is an open in the starter field coil circuit. Who is correct?
Answers
Answer:
The answer is "Neither".
Explanation:
Engine cranking implies that certain energy is applied to both the starter motor to motivate the engine only with one function: crank the wind-shaft of the engine and create an appropriate compressor in at most one piston for a good activation.
In this question, both Technician was wrong because the pressure motor oil is being used, a motor can crank very slowly or can't start throughout the cold weather.
The screw of shaft straightener exerts a load of 30 as shown in Figure . The screw is square threaded of outside diameter 75 mm and 6 mm pitch.
force required at the rim of a 300mm diameter hand wheel, if there is a collar
bearing of 50 mm mean diameter provided in the arrangement to exert axial
load. Assume the coefficient of friction for the collar as 0.2.
Answers
Answer:
See calculation below
Explanation:
Given:
W = 30 kN = 30x10³ N
d = 75 mm
p = 6 mm
D = 300 mm
μ = tan Φ = 0.2
1. Force required at the rim of handwheel
Let P₁ = Force required at the rim of handwheel
Inner diameter or core diameter of the screw = dc = do - p = 75 - 6 = 69 mm
Mean diameter of screw: *d = \(\frac{do + dc}{2}\) = (75 + 69) / 2 = 72 mm
and
tan α = p / πd = 6 / (π x 72) = 0.0265
∴ Torque required to overcome friction at he threads is T = P x d/2
T = W tan (α + Ф) d/2
T = \(W(\frac{tan \alpha + tan \theta}{1 - tan \alpha + tan \theta } ) * \frac{d}{2}\)
T = 30x10³ * ((0.0265 + 0.2) / (1 - 0.0265 x 0.2)) x 72/2
T = 245,400 N-mm
We know that the torque required at the rim of handwheel (T)
245,400 = P1 x D/2 = P1 x (300/2) = 150 P1
P1 = 245,400 / 150
P1 = 1636 N
2. Maximum compressive stress in the screw
30x10³
Qc = W / Ac = -------------- = 8.02 N/mm²
π/4 * 69²
Qc = 8.02 MPa
Bearing pressure on the threads (we know that number of threads in contact with the nut)
n = height of nut / pitch of threads = 150 / 6 = 25 threads
thickness of threads, t = p/2 = 6/2 = 3 mm
bearing pressure on the threads = Pb = W / (π d t n)
Pb = 30 x 10³ / (π * 72 * 3 * 25)
Pb = 1.77 N/mm²
Max shear stress on the threads = τ = 16 T / (π dc³)
τ = (16 * 245,400) / ( π * 69³ )
τ = 3.8 M/mm²
*the mean dia of the screw (d) = d = do - p/2 = 75 - 6/2 = 72
∴max shear stress in the threads τmax = 1/2 * sqrt(8.02² + (4 * 3.8²))
τmax = 5.5 Mpa
3. efficiency of the straightener
To = W tan α x d/2 = 30x10³ * 0.0265 * 72/2 = 28,620 N-mm
∴Efficiency of the straightener is η = To / T = 28,620 / 245,400
η = 0.116 or 11.6%
By assuming the coefficient of friction for the collar as 0.2. efficiency of straightner is 11.6%.
What is Wheel?Wheels are circular frames or disks that are mounted on machines or vehicles and are designed to rotate around an axis.
Given:
W = 30 kN = 30x10³ N
d = 75 mm
p = 6 mm
D = 300 mm
μ = tan Φ = 0.2
1. Force required at the rim of handwheel :
Let P₁ = Force required at the rim of handwheel
Inner diameter or core diameter of the screw = dc = do - p = 75 - 6 = 69 mm
Mean diameter of screw: *d = = (75 + 69) / 2 = 72 mm and
tan α = p / πd = 6 / (π x 72) = 0.0265
Torque required to overcome friction at he threads is T = P x d/2
T = W tan (α + Ф) d/2
T = 30x10³ * ((0.0265 + 0.2) / (1 - 0.0265 x 0.2)) x 72/2
T = 245,400 N-mm
We know that the torque required at the rim of handwheel (T)
245,400 = P1 x D/2 = P1 x (300/2) = 150 P1
P1 = 245,400 / 150
P1 = 1636 N
2. Maximum compressive stress in the screw :
30x10³
Qc = W / Ac = -------------- = 8.02 N/mm²
π/4 * 69²
Qc = 8.02 MPa
Bearing pressure on the threads (we know that number of threads in contact with the nut)
n = height of nut / pitch of threads = 150 / 6 = 25 threads
thickness of threads, t = p/2 = 6/2 = 3 mm
bearing pressure on the threads = Pb = W / (π d t n)
Pb = 30 x 10³ / (π * 72 * 3 * 25)
Pb = 1.77 N/mm²
Max shear stress on the threads = τ = 16 T / (π dc³)
τ = (16 * 245,400) / ( π * 69³ )
τ = 3.8 M/mm²
*the mean dia of the screw (d) = d = do - p/2 = 75 - 6/2 = 72
max shear stress in the threads τmax = 1/2 * sqrt(8.02² + (4 * 3.8²))
τmax = 5.5 Mpa
Therefore, efficiency of the straightener :
To = W tan α x d/2 = 30x10³ * 0.0265 * 72/2 = 28,620 N-mm
Efficiency of the straightener is η = To / T = 28,620 / 245,400
η = 0.116 or 11.6%
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tech a says that a slightly lean mixture offers good fuel economy and low exhaust emissions. Tech b says that a mixture that is too rich fouls spark plugs and causes incomplete burning. Who is correct
Answers
Explanation:
Exhaust emissions are gases that are expelled from vehicle engines and they include carbon monoxide, unburned fuel, nitrogen oxides and particulate matter such as mercury. These emissions can cause air pollution and green house effects which leads to climate changes. Low exhaust emissions can be achieved through the use of lean mixtures which has high air- fuel ratio and less emission. Therefore, Tech A is correct.
Rich mixtures are mixtures that are of low air- fuel ratios and it's burning in a diesel engine increases particulate matter emission, fouls spark plugs, causes incomplete burning. Therefore Tech B is equally correct. Hope this helps, thanks.
Two identical cars A and B are at rest on a loading dock with brakes released. Car C, of a slightly different style but of the same weight, has been pushed by dock workers and hits car B with a velocity of 2.25 m/s. Knowing that the collisions have taken place. (Round your answer to three decimal places.) m/s ←. m/s ← m/s ←. The velocity of car A is The velocity of car C is
Answers
Velocity of car C after the collision is 0.375 m/s.
Lets discuss the proccedure.
The velocity of car A after the collision is 0 m/s, since it was initially at rest and did not experience any change in momentum. The velocity of car C after the collision is 0.375 m/s. This can be calculated by using the conservation of momentum formula:
m1 * v1 + m2 * v2 = m1 * v1' + m2 * v2'
Where m1 and m2 are the masses of the two cars, v1 and v2 are their initial velocities, and v1' and v2' are their final velocities.
In this case, m1 and m2 are equal, and v1 = 0, so:
m * 0 + m * 2.25 = m * v1' + m * 0
2.25m = m * v1'
v1' = 2.25/m
v1' = 0.375 m/s
Therefore, the velocity of car C after the collision is 0.375 m/s.
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What can firefighters do to reduce the risk to people living in Skyview?
Answers
Answer:
The City can grant higher budgets to emergency services like the Fire Department, so a higher budget will allow engineers & scientists to innovate new technology and add more fire stations across the city.
Explanation:
most percussion instruments fall into the categories of idiophones and aerophones.
Answers
Most percussion instruments fall into the categories of idiophones and aerophones, let's discuss what they mean and their types.
The term "idiophone" is derived from two Greek words, "idio," which means "distinct," and "phone," which means "sound." An idiophone is a percussion instrument that creates sound by vibrating the entire instrument rather than a membrane, string, or stretched skin. Aerophones are musical instruments that produce sound primarily by vibrating a column of air within the instrument. They are further categorized into various subcategories based on the instrument's shape, size, and sound characteristics. Most percussion instruments are classified as either idiophones or aerophones, depending on the sound's origin or how the instrument produces sound. Most percussion instruments fall into the categories of idiophones and aerophones. This classification is based on how the instruments create sound. Let's discuss both types in detail. An idiophone is a percussion instrument that creates sound by vibrating the entire instrument rather than a membrane, string, or stretched skin. Some common examples of idiophones include triangles, bells, and xylophones. Aerophones are musical instruments that produce sound primarily by vibrating a column of air within the instrument. Some examples of aerophones include trumpets, flutes, and clarinets. To conclude, both idiophones and aerophones are important categories of percussion instruments. They differ in how they create sound, but both play a significant role in music and are widely used in various cultures worldwide.
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For fire alarm cable to be effective the _______ wire must be grounded.
Answers
Answer:
the ground wire must be grounded.
Explanation:
For fire alarm cable to be effective, the ground wire must be grounded. This is because grounding the wire helps to ensure that the fire alarm system is properly connected to the earth, which can help to protect against electrical surges and other issues that could interfere with the proper functioning of the system. Additionally, grounding the wire can help to prevent the build-up of static electricity, which can damage the cable or the fire alarm system itself.
Which of the following lists, among other things, the vehicle identification, the customer's concern or complaint, and costs for parts? A. Repair order B. Owner's manual C. Comeback report D. Service manual
Answers
Answer:
I think it is D.service manual
Explanation:
Because it is the vehicle identification