The skin surface temperature is 307.2 K and the rate of heat loss is 146 W.
How to find skin surface temperature?The skin surface temperature may be obtained by performing an energy balance at the skin surface to give the formula;
k(T_i - T_s)/L = h(T_s - T_∞) + h_r(T⁴_s - T⁴_surr)
Now, T_surround = T_s and so making T_s the subject gives us;
T_s = [(k*T_i)/L + (h + h_r)T_∞]/((k/l)
Using the equation h_r = εσ(T_s + T_surr)(T²_s + T²_surr) we can find h_r with a guessed value of T_s = 305 K and T∞ = 297 K, to yield h_r = 5.9 W/m².K.
Then, substituting numerical values into the T_s equation, we have;
T_s = [(0.3 * 308)/(3 * 10⁻³) + (2 + 5.9)297]/[((0.3 * 308)/(3 * 10⁻³)) + (2 + 5.9)]
T_s = 307.2 K
Thus the skin temperature is 307.2 K.
The rate of heat loss can be found by evaluating the conduction through the skin/fat layer:
q_s = kA(T_i - T_s)/L
q_s = 0.3*1.8(308 - 307.2)/(3 * 10⁻³)
q_s = 146 W
Read more about Skin Surface Temperature at; https://brainly.com/question/14866809
#SPJ1
A 4KJ of energy is supplied to a machine used for lifting a mass. The force required is 800N. If the machine has an efficiency of 60℅,to what height will it lift the mass?
The height at which the mass will be lifted is; 3 meters
How to utilize efficiency of a machine?Formula for efficiency is;
η = useful output energy/input energy
We are given
η = 60% = 0.6
Input energy = 4 KJ = 4000 J
Thus;
0.6 = useful output energy/4000
useful output energy = 0.6 * 4000
useful output energy = 2400 J
Work done in lifting mass(useful output energy) = force * distance moved
Useful output energy = 800 * h
where h is height to lift mass
Thus;
800h = 2400
h = 2400/800
h = 3 meters
Read more about Machine Efficiency at; https://brainly.com/question/3617034
#SPJ1
By the end of the day, a 45 ft x 25 ft x 8 ft office has a carbon dioxide air level of 1,100 ppm. Determine the time in hours necessary to reduce this concentration to ambient levels (approximately 325 ppm) assuming 20% of the return is "fresh" makeup air and there are two air changes per hour.
The total hours that are necessary to reduce carbon dioxide level to at least 325 ppm are 4 hours.
How does carbon dioxide concentration change over time?First hour:
1,100 - 20 %1,100 - 220 = 880880 - 20%880 - 176 = 704Second hour:
704 - 20% 704 - 140.8 =663.2663.2 - 20%663.2 - 132.64 = 530.56Third hour:
530.56 - 20% 530.56 - 106.112 = 424.44424.44 - 20%424.44 - 84.88 = 339.55Fourth hour:
339.55 - 20%339.55 - 67.91 = 271.64Learn more about carbon dioxide in: https://brainly.com/question/3049557
#SPJ1
s) Use Cramer’s rule to solve the system below, and state the condition at which solution exists. ax+by = 1 cx+dy =−1
(a) The solution to the system of equation is, x = (d + b)/(ad - cb) and y = (-a - c)/(ad - cb).
(b) The condition at which the solution exists is, ad - cb ≠ 0.
Solving the system of equation with Cramer's rule
ax + by = 1
cx + dy = -1
D = [a b]
[c d]
D = ad - cb
Dx = [1 b]
[-1 d]
Dx = d + b
Dy = [a 1]
[c - 1]
Dy = -a - c
x = Dx/D
x = (d + b)/(ad - cb)
y = Dy/D
y = (-a - c)/(ad - cb)
Cramer's rule applies to the case where the coefficient determinant is nonzero.
Thus, D ≠ 0 (ad - cb ≠ 0).
Learn more about Cramer's rule here: https://brainly.com/question/10445102
#SPJ1
what is a home that has its own roof, foundation, and a wall that extends from the roof through the foundation
Fire wall is a home that has its own roof, foundation, and a wall that extends from the roof through the foundation.
What is a Fire wall?This is known to be a form of rated assembly that ranges from the foundation to and via the roof of a building to lower the rate of fire spread.
Note that, Fire wall is a home that has its own roof, foundation, and a wall that extends from the roof through the foundation.
Learn more about Fire wall from
https://brainly.com/question/13024946
#SPJ1
You are about to perform PMCS on your M1114? What resource should you use for the procedures and instructions for performing PMCS?
The resources and instructions that should be used for the procedures of performing PMCS are:
Operator's manualsSafety cautions and warnings.Fording kitHeating and cooling systems.What is PMCS?PMCS is an acronym for preventive maintenance checks and services and it can be defined as the maintenance, checks, and services that are typically performed before, during, and after the use of any type of military equipment such as:
M1114M1151M1123Basically, the resources and instructions that should be used for the procedures of performing PMCS are:
Operator's manualsSafety cautions and warnings.Fording kitHeating and cooling systems.Read more on PMCS here: https://brainly.com/question/15720250
#SPJ1
Two technicians are discussing a vehicle that cranks slowly when the key is turned to the crank position. The positive battery terminal is noticably hotter than the negative terminal. Technician A says that the positive battery terminal must have an excessive voltage drop since it is hotter. Technician B says that the negative battery terminal must have an excessive voltage drop since it is cooler. Who is correct?
Answer:
Both are right
Explanation:
The solid cylindrical bar shown is subjected to a bending force F = 55kN, an axial load P = 8 kN, and a torsional load T = 30 kN-mm. The bar is made of AISI 1060 CD steel (Sy = 280 MPa, Sut = 330 MPa). Find the factor of safety based on Maximum Distortion Energy Theory.
The factor of Safety by Maximum Distortion Energy Theory is given as: N = 6.04
What is Maximum Distortion Energy Theory?
According to this idea, failure by yielding happens when the distortion energy per unit volume in a condition of combined stress equals that associated with yielding in a basic tension test at any location in the body.
What is the calculation for the above value?
Note that we are given the following:
A solid Steel bar subjected to a bending force of F = 55kN
Torsional load T = 30 kN-mm; and
Yield Strength (sy) = 280Mpa
Sut = 330 Mpa
The formula for Normal Stress is given as:
[tex]\alpha _{x}[/tex] = [UP/πd²] + [ (32* f * L)/πd³]
= [(4 * 8 * 10³)/π * (0.02)²] + [(32 * 55 *10³ * 0.1)/ π * (0.02)³]
= 25.46 + 7.003
[tex]\alpha _{x}[/tex]= 32.5 Mpa
Tyz = (16T)/πd³
= (16 * 30)/ π * (0.02)³
= 19.098
Tyz = 19.098
Following from the above, sate of stress, we have:
α₁ = αₓ = 32.46 Mpa; and
α₂ = Tyz = 19.098 Mpa;
α₃ = -Tyz = -p19.098 Mpa;
Utilizing the formula given by the Maximum Distortion Energy Theory:
α₁² + α₂² + α₃² - (α₁α₂ + α₂α₃ + α₃α₁)
= Sy²/N²
→ 32.46² + 19.098² + 19.098² - ( 32.46* 19.098 - 19.098² -32.46 * 19.098)
= 280/N²
N = 6.04
Learn more about Maximum Distortion Energy Theory at:
https://brainly.com/question/22435706
#SPJ1
x cotx expansion using maclaurins theorem.
It is to be noted that it is impossible to find the Maclaurin Expansion for F(x) = cotx.
What is Maclaurin Expansion?The Maclaurin Expansion is a Taylor series that has been expanded around the reference point zero and has the formula f(x)=f(0)+f′. (0) 1! x+f″ (0) 2! x2+⋯+f[n](0)n!
What is the explanation for the above?
as indicated above, the Maclaurin infinite series expansion is given as:
F(x)=f(0)+f′. (0) 1! x+f″ (0) 2! x2+⋯+f[n](0)n!
If F(0) = Cot 0
F(0) = ∝ = 1/0
This is not definitive,
Hence, it is impossible to find the Maclaurin infinite series expansion for F(x) = cotx.
Learn more about Maclaurin Expansion at;
https://brainly.com/question/7846182
#SPJ1
A kitchen contains one section of counter that's 20 inches
long, one section that's 10 inches long, one section that's
32 feet long, and an island that's 4 feet long. How many
receptacles are needed for all of these areas?
A. Two
B. Three
C. Four
D. Five
The number of receptacles that are needed for all of these kitchen areas are: C. Four.
What are receptacles?Receptacles can be defined as types of sockets or series of outlets (openings) that provides a path where current can be taken in a wiring system, so as to run electrical appliances in buildings.
Based on the information provided, the number of receptacles that are needed for all of these kitchen areas are four because one would be used in each area.
Read more on receptacles here: https://brainly.com/question/23839796
#SPJ1
linear circuit consist independent and dependent element yes or no
A regulator is required on a nitrogen cylinder to
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.
Read more on regulator here: https://brainly.com/question/4652901
#SPJ1
Which product is superior for sound control and has a better thermal property, Standard batt Insulation, or HP Fiberglass Insulation? Explain why?
HP Fiberglass Insulation is superior for sound control and has a better thermal property.
What is Fiberglass Insulation is better?Fiberglass is a better insulator than wood. It is available in various widths, with the widest being 3/4 inch and having an R-value of 0.94. However, the R-value of fiberglass, the thinnest of which is 3/4 inch, is 3. Fiberglass is a superior insulator as a result.
Thus, option B is correct.
For more details about Fiberglass Insulation, click here:
https://brainly.com/question/14040359
#SPJ1
1. Write two statements for each of the following operators using the emp
and dept tables. Be sure to include AND & OR statements as well.
OPERATORS:
= (equals)
<> (not equal to)
> (greater than)
< (less than)
in
not in
LIKE
Answer:
the answer is simply 5000250 because the phenomicals add up to the mainstream with beacoups
As project manager, you approve a team member’s request to change the order of their tasks because they think it will be more efficient. However, this change disrupts another team member’s work process: they need to do two additional tasks not related to the project’s goal. What is happening on this project?
The project is going to scope if the situation happens. Option A is correct.
What is the function of a project manager?Project managers are in charge of organizing, planning, and guiding the execution of certain projects for an organization .
As the project manager, you grant a team member's request to rearrange their work in a way they believe will increase productivity.
However, this modification interferes with another team member's workflow since they now have to complete two more activities that are unrelated to the project's objective. The project will be within its scope.
Hence option A is correct.
To learn more about the project manager refer;
https://brainly.com/question/15404120
#SPJ1
= 1. Set Square should be placed against the lower edge of the T-Square.
True or false?
The Set Square should be placed against the lower edge of the T-Square, so the statement is true.
The T-square must be placed up against the edge of the drawing board. There must be no gaps otherwise the paper will not be set up correctly and drawing accurate horizontal and vertical lines will be impossible. The T-square must be placed up against the edge of the drawing board. There must be no gaps otherwise the paper will not be set up correctly and drawing accurate horizontal and vertical lines will be impossible.
With that being said, it is true that the set square should be placed against the lower edge of the T-square.
See more about Drawing at: https://brainly.com/question/23033135
#SPJ1
calculate area moment of inertia for a circular cross section with 6 mm diameter
16 mm^4
64 mm ^4
113 mm^4
323 mm^4
1016 mm^4
The area moment of inertia for a circular cross-section with a 6 mm diameter will be 64 mm⁴. Option B is correct.
What is a moment of inertia?The moment of inertia is defined as the resistance offered in the rotation of the moment.
Given data;
The diameter of circular section ,d = 6 mm
The moment of inertia is, I
The moment of inertia for the circular cross-section;
[tex]\rm I = \frac{\pi d^4}{64} \\\\ \rm I = \frac{3.14 \times 6^4 }{64} \\\\ I = 63.585 mm^4[/tex]
The area moment of inertia for a circular cross-section with a 6 mm diameter will be 64 mm⁴
Hence option B is correct.
To learn more about the moment of inertia refer;
https://brainly.com/question/15246709
#SPJ1
The controller determines if a(n) _________ exists by calculating the difference between the SP and the PV.
The controller determines if a(n) error exists by calculating the difference between the SP and the PV.
How does a controller work in control system?The Control system is one where it entails if the output is one that has an effect on the input quantity.
So it uses the PV(Process Variable) set against the SP(Setpoint) to know if an error exists.
So, The controller determines if a(n) error exists by calculating the difference between the SP and the PV.
Learn more about controller from
https://brainly.com/question/14617664
#SPJ1
4. A banking system provides users with several services:
(a) to check their accounts to see recent transactions and balances;
(b) to pay bills online;
(c) to buy and sell investments.
All of these services require a secure log-in. If the system crashes or the network
connection fails during a transaction, all the financial data must be left in a consistent
state.
a. Draw use case diagrams for these requirements. Use standard symbols and shapes. MS
Office Visio, Lucidchart, draw.io, Creately, Smartdraw or Figma are optional tools
b. Give the use case specification for paying a bill online.
A diagram showing a use case diagrams for these requirements is given in the image attached.
What is system Case diagram?A use case diagram is known to be a kind of graphical illustration of a users in terms of their various possible association or interactions within any given system.
A use case diagram in banking can be used to prepare, depict and also to know all the functional requirements of the banking system.
Therefore, Give the use case specification for the banking system services and paying a bill online is given in the image attached.
Learn more about Case diagram from
https://brainly.com/question/12975184
#SPJ1
norton's theorem and thevenin's theorem related linearity property
Norton's theorem in regards to linearity property is known to be one that employ the use of a current source while the Thevenin's theorem is known to be one that employ the use of a voltage source.
Thevenin's theorem make use of a resistor in a kind of series, but Norton's theorem is known to use a resister set in a kind of parallel way in line with the source.
What is Norton's Theorem?
Norton's Theorem is known to be a law that states that one can be able to simplify any form of linear circuit, no matter how difficult or hard that it may be, to an equivalent circuit through the use of only one current source and also the use of a parallel resistance linked to a load.
Note that, Norton's theorem in regards to linearity property is known to be one that employ the use of a current source while the Thevenin's theorem is known to be one that employ the use of a voltage source.
Learn more about Norton's theorem from
https://brainly.com/question/1593664
#SPJ1
A large retirement community wants to host a grand birthday party for its residents who recently
became centenarians (a centenarian is someone who has lived 100 years). The party organizers learn
that 25 new centenarians will be the guests of honor at the party, so they decide to prepare some
interesting facts about this group's age. They start brainstorming, and one of the organizers says,
"Hey, the standard deviation of their ages would be an interesting fact."
Which of the following best represents the standard deviation for the ages of the new centenarians?
The ideal response for the age standard deviation would be zero.
Why is there a standard deviation?A standard deviation (or σ) is a measure of how distributed the data is in reference to the mean. When the standard deviation is low, the data are concentrated around the mean, and when it is large, the data are widely dispersed.
They invited 25 persons who recently turned 100 years old, so the majority of attendees will be between the ages of 100 and 102. There is extremely little likelihood that anyone will be older than 102.
Since the majority of the data are centered at 100, the standard deviation will be zero or very close to it.
Learn more about standard deviation on:
https://brainly.com/question/475676
#SPJ1
Which of the following best represents the standard deviation for the ages of the new centenarians?
0
100
30
25
Split point twist drills
Answer:
A split point twist drill is a self-centering speed bit with a cutting angle of 135 degrees. It is specifically designed to drill into metal and other hard materials without wandering around on the surface.
how to write a 5bit register if a series is moved to the shift register from left to right
The Bidirectional Shift Register is the shift register that allows one to write a 5bit register if the series is shifted from left to right.
What is a value of a 5-bit register?A 5-bit register is valuable because it can represent up to 32 items. It is to be noted that a bit is a digit that is binary that is indicative of two states.
While a 5-bit register can have a possible number of 32 values,
6 can hold 64;7 can hold 128;8 can hold 256 etc.Learn more about registers at;
https://brainly.com/question/19091159
#SPJ1
Electronic returnless fuel systems use the question 3 options: a) throttle bodymounted regulator. b) mechanical bypass regulator. c) in-line fuel supply pump. d) pressure vent valve in tank.
Electronic returnless fuel systems use an in-line fuel supply pump.
What is the role of electronic Returnless fuel systems?Electronic returnless EFI systems is known to bean “On Demand” returnless EFI systems due to the fact that it make use of fuel tank pressure sensor to examine fuel pressure.
Therefore, one can say that an Electronic returnless fuel systems use an in-line fuel supply pump.
Learn more about fuel systems from
https://brainly.com/question/25870707
#SPJ1
A fair cubical die is thrown four times. use the binomial probability formula to calculate the probability of at least two 3's.
By using the binomial probability formula, the probability of at least two 3's is equal to 0.1319.
How to calculate the probability of at least two 3's?Since the fair cubical die is thrown four times, the number of times is given by n = 4 and the probability of 3's is P = 1/6.
Mathematically, the binomial probability formula is given by:
[tex]P(X \geq x) =\sum^{n}_{r=x} ^nC_r (p)^r (q)^{(n-r)}\\\\P(X \geq 2) = \; ^4C_2 (\frac{1}{6} )^2 (\frac{5}{6} )^{(4-2)} + ^4C_3 (\frac{1}{6} )^3 (\frac{5}{6} )^{(4-3)} + ^4C_4 (\frac{1}{6} )^4 (\frac{5}{6} )^{(4-4)}\\\\P(X \geq 2) = 6 \times \frac{1}{36} \times \frac{25}{36} + 4 \times \frac{1}{216} \times \frac{5}{36} + 1 \times \frac{1}{1296} \times 1\\\\P(X \geq 2) = \frac{150}{1296} + \frac{20}{1296}+ \frac{1}{1296}[/tex]
P(X ≥ 2) = 19/144
P(X ≥ 2) = 0.1319.
Read more on probability here: https://brainly.com/question/25870256
#SPJ1
Why are diode logic gates not suitable for cascading operation?
Please do not copy anything from anywhere.
Diode logic gates are not suitable for cascading operation because the pull-down or pull-up resistance within makes them a high output resistance device.
What is a cascading operation?A cascading operation refers to a process in electrical engineering which involves the use of a circuit breaker's current-limiting capacity, so as to enable an installation of lower-rated and lower-cost circuit breakers.
According to the National Electrical Code (NEC), diode logic gates are not entirely suitable for cascading operation due to the fact that the pull-down or pull-up resistance within makes them a high output resistance device.
Read more on logic gates here: https://brainly.com/question/24708297
#SPJ1
Describe how you will a use a feedback mechanism to monitor Marissa’s wellbeing and ensure that support measures are working.
Feedback mechanisms gives a way to effectively to change behavior and it can be used to monitor Marissa's wellbeing by:
Asking her consistently how she feels, how she is and getting her settled.With it, one can be able to deduce what is wrong with her and address it.What is a feedback mechanism?The aim of a feedback mechanism is one that is known to be forward focused as it helps to link one's current actions to your future results.
Therefore Feedback mechanisms gives a way to rightly to alter behavior and it can be used to monitor Marissa's wellbeing though asking her consistently how she feels, how she is and getting her settled and one can be able to find what is wrong with her and address it.
See full question below
Due to a change in ownership and management of your facility, there has been a high turnover of managers in the past six months. Staff are very confused as to what to do, what is required and who to report to causing a lot of stress and issues in the workplace. The new management put into place a change management initiative to clarify business objectives and work roles. After a few weeks, things started to settle down and staff are performing better.
Beth, a support worker approached you one day and said that Marissa, a colleague has been having emotional breakdowns lately at work, crying unexpectedly, unable to concentrate on her tasks and taking longer breaks than usual. Beth needs to repeat instructions several times before Marissa can understand a task. Her actions are disrupting other staff and Beth is concerned about any accidents with client care due to Marissa's lack of concentration.
You invite Marissa for an informal meeting to find out how she's coping. Before the meeting, you checked Marissa's HR file and discovered that she is from the Philippines and English is her second language. She's a very hard worker and clients have commended her for her caring and sensitive nature.
In the meeting with Marissa, she nervously disclosed to you that she is worried about losing her job due to all the changes in management. She cannot afford to lose her job as she is a single parent responsible for her three children. She is also having a hard time coping with different instructions and expectations from different managers and she doesn't know who she can talk to anymore.
Question 1
Describe how you will a use a feedback mechanism to monitor Marissa's wellbeing and ensure that support measures are working.
Learn more about feedback mechanism from
https://brainly.com/question/8726791
#SPJ1
Miguel’s presentation on the Iron Age moving into the Middle Ages was detailed. He outlined the process of smelting and clarified how metals such as copper, tin, and bronze could be combined with intense heat to create strong iron. He added some images of tools that came into wide use, such as adzes and axes and even armor. Miguel left out one tool, however, that was highly important to the civilization’s progress. What might have been that tool, and why is it important?
A.
hammer, invaluable for building homes
B.
drinking vessel, essential for carrying water
C.
fencing, to create separation between properties
D.
heavy plough, which advanced food production
The heavy plough is the most important tool that Miguel left out of his presentation. The correct option is D.
The heavy plough was an important tool in the Iron Age and Middle Ages because it allowed farmers to cultivate more land and produce more food. This led to a population increase and a more prosperous society.
The other tools mentioned are also important, but they are not as essential as the heavy plough.
The hammer is useful for building homes, but it is not as important as the plough for food production. The drinking vessel is essential for carrying water, but it is not as important as the plough for advancing food production.
Fencing is useful for creating separation between properties, but it is not as important as the plough for advancing food production.
Therefore, the correct option is D.
To learn more about the iron age;
https://brainly.com/question/32988416
#SPJ3
Which of the following is NOT true?
a. The Thevenin voltage is equal to the open circuit voltage
b. We can find the Thevenin resistance for any circuit by zeroing all sources and finding the equivalent resistance of the resulting network.
c. We can do a source transformation to switch between Thevenin and Norton equivalent circuits.
d. The Norton current is equal to the short circuit current.
e. The Thevenin resistance is equal to the Norton resistance.
A statement which isn't true is that: B. we can find the Thevenin resistance for any circuit by zeroing all sources and finding the equivalent resistance of the resulting network.
The true statements about these theorems.In Electrical engineering, the true statements about Thevenin's theorem and Norton's theorem include the following:
The Thevenin voltage is generally equal to the open circuit voltage.We can do a source transformation to switch between Thevenin and Norton equivalent circuits.The Norton current is the same as the short-circuit current.The Thevenin resistance is the same as the Norton resistance.In this context, we can infer and logically deduce that we cannot find the Thevenin resistance for an electrical circuit by zeroing all sources and finding the equivalent resistance of the resulting network.
Read more on Thevenin's theorem here: https://brainly.com/question/28007778
#SPJ1
You test a diode with an ohmmeter. The two readings indicate a very low value of resistance. The diode is probably __________.
Answer:
shorted
Explanation:
A diode is a device that passes current much better in one direction than in the reverse direction.
Ohmmeter testConceptually, an ohmmeter applies a voltage to the device under test and reports the current through the device on a scale calibrated in ohms. It typically has a low enough open-circuit voltage, and a high enough internal resistance so as to avoid damage to parts under test.
A "continuity" tester may have an open-circuit voltage of a few tens of millivolts and/or a short-circuit current of a few microamps, so as to properly detect continuity and avoid contact damage in "dry" circuits. Such a tester is virtually useless for diode testing.
An ohmmeter suitable for diode testing will generally have an open-circuit voltage of a few volts, and a short-circuit current of a few milliamps. When such a meter is used to test a diode, it will indicate a few kilohms (or less) in the "forward" direction, and several 10s or 100s of megohms in the reverse direction.
Low-resistance readingsIf the "forward" resistance reading is unusually low (a few ohms), the diode may be damaged. If both forward and reverse readings are unusually low, the diode my be considered to be shorted.
How does a tempering valve work?
By mixing hot water with cold water, the tempering valve enables hot water to be kept at a temperature that kills bacteria while distributing it to the fixtures at a temperature that won't burn people. By adjusting the tempering valve's adjuster, the required temperature may be set for the valve. A thermostatic mixing valve can hold water at 1°C +/- and responds more quickly to changes in incoming water temperature than a tempering valve, which is accurate to around 3°C +/-.