Steam enters a turbine operating at steady state with a specific enthalpy of 1407.6 Btu/lb and expands to the turbine exit where the specific enthalpy is 1236.4 Btu/lb. The mass flow rate is 5 lb/s. During this process, heat transfer to the surroundings occurs at a rate of 40 Btu/s. Neglecting kinetic and potential energy effects, the power developed by the turbine is
Answers
Answer:
The power developed by the turbine is 816 BTU per second.
Explanation:
Thermodynamically speaking, a turbine produces work at the expense of fluid energy. By First Law of Thermodynamics, the energy balance of a turbine working at steady state is:
\(-\dot Q -\dot W +\dot m\cdot (h_{in}-h_{out}) = 0\) (1)
Where:
\(\dot Q\) - Heat transfer rate, measured in BTU per second.
\(\dot W\) - Power developed by the turbine, measured in BTU per second.
\(\dot m\) - Mass flow rate, measured in pounds per second.
\(h_{in}\), \(h_{out}\) - Specific enthalpies at inlet and outlet, measured in BTU per pound.
If we know that \(\dot Q = 40\,\frac{BTU}{s}\), \(\dot m = 5\,\frac{lbm}{s}\), \(h_{in} = 1407.6\,\frac{BTU}{lbm}\) and \(h_{out} = 1236.4\,\frac{BTU}{lbm}\), then the power developed by the turbine is:
\(\dot W = -\dot Q + \dot m \cdot (h_{in}-h_{out})\)
\(\dot W = 816\,\frac{BTU}{s}\)
The power developed by the turbine is 816 BTU per second.
Related Questions
There is a GIS dataset of points of interest (POIs) in a region, and you would like to select only those located within a pre-defined study area. How will you translate it into a spatial query?
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Select POIs from the GIS dataset that intersect or are within the study area boundary.
To select the POIs that are located within a pre-defined study area, you can use a spatial query. A spatial query is a query that combines and manipulates spatial features or data within a GIS dataset. To execute the query, you need to specify a spatial relationship between the study area boundary and the POIs. In this case, you would want to select POIs that intersect or are within the study area boundary. To do this, you can use a spatial query such as ST_Intersects or ST_Within. ST_Intersects will select all the POIs that intersect the study area boundary, while ST_Within will select all the POIs that are located completely within the study area boundary. After running the query, you will have a list of POIs that meet the specified criteria.
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10.46 A 65-kVA load with a lagging power factor is combined with a 25-kVA synchronous motor load which operates at pf = 0.60 leading. Find the power factor of the 65-kVA load, if the overall power factor is 0.85 lagging. ??? Ans. 0.585 lagging
Answers
Answer:
Read Below
Explanation:
Apparent power (volt-amperes) is the trigonometric sum of Real power (watts) and reactive power (volt-amperes reactive - VARs). Stated mathematically: VA squared = watts squared plus VARs squared
similarly, power factor, the ratio of real power to apparent power, is the cosine of the angle between the real power leg and apparent power hypotenuse of a right triangle (Reactive power being the other leg).
Just use these relationships and a bit of high school trigonometry and you can calculate the apparent power and power factor for the system you are describing.
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The power factor of the 65-kVA load, if the overall power factor is 0.85 lagging is 0.585 lagging.
What is Apparent energy?
Apparent energy (volt-amperes) is the trigonometric sum of Real energy (watts) and reactive energy (volt-amperes reactive - VARs). Stated mathematically: VA squared = watts squared plus VARS squared similarly, energy component, the ratio of actual energy to obvious energy, is the cosine of the perspective among the actual energy leg and obvious energy hypotenuse of a proper triangle (Reactive energy being the opposite leg).
Just use those relationships and a chunk of excessive college trigonometry and you may calculate the obvious energy and energy component for the machine you're describing.
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floyds cycle detection algorithm advantages and disadvantages
Answers
The advantage of the Floyd algorithm is its versatility. Numerous problems can be resolved with the algorithm. A disadvantage is the algorithm is quite complex and can be difficult to understand.
What is Floyd's algorithm?Only two pointers—each moving through the succession at a different speed—are used in Floyd's method, which is a pointer-based algorithm. In reference to Aesop's story The Tortoises and the Hare, it is also known as the "turtle and the hare algorithm."
Why Floyd algorithm is used?The Floyd algorithm is applied to find that shortest route via the weighted graph between each vertex. Both direct and undirected graphs can be used with this approach, but the graph having negative cycles cannot be used. Its space complexity is O, and its time complexity is O(N-L), where N represents the number of nodes in the linked list and L is the length of the loop (1).
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Facts about cellphones
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Answer:
Your mobile phone has more computing power than the computers used for the Apollo 11 moon landing.
Mobile phones have to “work harder” to get a signal if you are in a moving vehicle.
The first mobile phone was made in 1973.
The first mobile phones that went on sale in 1983 cost nearly $4,000 each.
In 2012 Apple sold 340,000 phones per day.
4 out of 10 Brits admit to snooping on their partners phone.
Out of the 53% of snoopers that found incriminating evidence on their partner’s phone, 5% went on to terminate their relationship.
Waterproof mobile phones came to market because Japanese youngsters like to use them in the shower.
Apparently mobile phones have 18 times more bacteria on them than toilet handles!
Phubbing describes the act of snubbing someone by using your mobile phone in their company.
In 2015 more people died from taking selfies than shark attacks.
Teenagers that use a phone more than 2 hours a day increase their risk of depression and anxiety.
Nomobophobia is severe anxiety caused by the thought or act of losing your phone or running out of battery.
Explanation:
Using a definition of the limit of function, prove that the following functions are continuous
at = 0:
) () = 1 − 2 + 52, 0 = 1
Answers
Answer:
... you gotta do divson?
Explanation:
Weight, density, electrical conductivity, and coefficient of thermal expansion are examples of _______ properties.
Answers
Answer:
"Physical" would be the right approach.
Explanation:
Those properties would be that can be established without even any alteration throughout the identification of that same object. Property (whenever color, compressive strength, vapor pressure) of substance which does not require a biochemical alteration including its representation.So the answer here is just the perfect one.
deduce the relationship between e.m.u and e.s.u in technology .
Answers
In the CGS system, the unit of charge is the charging unit (ESU). Also known as "Statistical Pendant" (StatC). In the CGS system, the load unit is the electromagnetic unit (E.M.E.).
The e.s.u. of charge, also known as franklin or statcoulomb, is the charge such that two similar q=1statC charges at a space of 1cm from each other exert an electrostatic force of 1dyn on each other.
The e.m.u. of current, also called the biot or abampere, is the current such that two infinitely-long straight, parallel conductors carrying 1abA of current and separated by 1cm exert a magnetostatic force of 2dyn on each other.
The relations between these units are such that
\(\frac{1 statC}{1 abA * 1s} = \frac{1 statC}{1abC} = \frac{1}{C} = \frac{1 statA}{1abA} = \frac{\frac{1 statC}{s} } {1 abA}\)
where c is the speed of light.
The ESU and EMU systems of electromagnetic units are different and they should generally be considered separate and independent (if relatively similar), and they do not coincide with the gaussian set of electromagnetic units.
For example, since the electrical displacement vector D is defined as \(E + 4\pi P\) in the ESU system and \(\frac{1}{c^{2} } E + 4\pi P\) the EMU system, it is not possible to exchange the formulas of one system for another without using a formula dictionary like the one at Jackson's end. There is not. classical electrodynamics.
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The rafter is fastened to the outside wall so that the plumb cut in the birdsmouth is tight to the exterior wall sheathing
Select one:
O True
O False
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How is the foundation for a skyscraper different from a house?
Answers
Answer:
Shallow foundations, often called footings, are usually embedded about a metre or so into soil. ... Another common type of shallow foundation is the slab-on-grade foundation where the weight of the structure is transferred to the soil through a concrete slab placed at the surface.
Explanation:
Because I said so.
Compare disk block allocation schemes for different operations.
A file consists of eight logical blocks, A through H.
The current position is at the beginning of block E. The following operations are performed:
read block D, read block F, delete block E, insert new block C' between C and D.
For each of the four disk block allocation schemes, contiguous, linked, using FAT, and indexed, determine which blocks must be read from and written to the disk to perform each of the four operations.
Answers
To determine the blocks that must be read from and written to the disk for each operation in different disk block allocation schemes, we need to consider the characteristics of each scheme and analyze the given sequence of operations.
Which blocks need to be accessed and modified for each operation in various disk block allocation schemes?The disk block allocation schemes and their impact on the required read and write operations. In the contiguous allocation scheme, where files occupy consecutive blocks, the read operation for block D would require accessing block D directly. Similarly, the read operation for block F would require accessing block F directly. The delete operation of block E would entail modifying the file control information to skip block E. Finally, inserting a new block C' between C and D would involve shifting subsequent blocks and updating the file control information accordingly.
In the linked allocation scheme, where blocks are linked together via pointers, the read operation for block D would involve traversing the linked blocks until reaching block D. Similarly, the read operation for block F would involve traversing the linked blocks until reaching block F. The delete operation of block E would entail updating the pointers to bypass block E. Inserting a new block C' would require finding a free block and updating the pointers accordingly
Using the File Allocation Table (FAT) scheme, the read operation for block D would involve checking the FAT to find the location of block D. Similarly, the read operation for block F would involve checking the FAT to find the location of block F. The delete operation of block E would require updating the FAT to mark block E as free. Inserting a new block C' would involve finding a free block, updating the FAT to allocate it, and adjusting the pointers accordingly.
In the indexed allocation scheme, where each file has an index block containing pointers to its data blocks, the read operation for block D would involve accessing the index block to find the location of block D. Similarly, the read operation for block F would involve accessing the index block to find the location of block F. The delete operation of block E would require updating the index block to remove the pointer to block E. Inserting a new block C' would involve finding a free block, updating the index block to include a pointer to the new block, and adjusting the pointers accordingly.
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2. Why is pitch important to passenger comfort?
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Taking the convection heat transfer coefficient on both sides of the plate to be 860 W/m2 ·K, deter- mine the temperature of the sheet metal when it leaves the oil bath. Also, determine the required rate of heat removal from the oil to keep its temperature constant at 45°C.
Answers
Answer:
Hello your question is incomplete attached below is the complete question
answer :
a) 95.80°C
b) 8.23 MW
Explanation:
Convection heat transfer coefficient = 860 W/m^2 . k
a) Calculate for the temp of sheet metal when it leaves the oil bath
first step : find the Biot number
Bi = hLc / K ------- ( 1 )
where : h = 860 W/m^2 , Lc = 0.0025 m , K = 60.5 W/m°C
Input values into equation 1 above
Bi = 0.036 which is < 1 ( hence lumped parameter analysis can be applied )
next : find the time constant
t ( time constant ) = h / P*Cp *Lc --------- ( 2 )
where : p = 7854 kg/m^3 , Lc = 0.0025 m , h = 860 W/m^2, Cp = 434 J/kg°C
Input values into equation 2 above
t ( time constant ) = 0.10092 s^-1
Determine the elapsed time
T = L / V = 9/20 = 0.45 min
∴ temp of sheet metal when it leaves the oil bath
= (T(t) - 45 ) / (820 - 45) = e^-(0.10092 * 27 )
T∞ = 45°C
Ti = 820°C
hence : T(t) = 95.80°C
b) Calculate the required rate of heat removal form the oil
Q = mCp ( Ti - T(t) ) ------------ ( 3 )
m = ( 7854 *2 * 0.005 * 20 ) = 26.173 kg/s
Cp = 434 J/kg°C
Ti = 820°C
T(t) = 95.80°C
Input values into equation 3 above
Q = 8.23 MW
When the pressure relief valve in a system opens during work
Answers
Answer:
The relief valve will open as pressure caused by a downstream load or backpressure increases high enough to force the poppet or spool open against its spring.
Explanation:
What three modern products would not be available without watt’s contribution to the field?.
Answers
Locomotives, steam ships, and factories with coal-powered machinery these modern products would not be available without watt’s contribution.
How did James Watt's invention affect society?The industrial society of the 18th century was significantly impacted by James Watt's steam engine. Compared to preceding models, it was more economical and efficient.
The watt, a unit of power in the International System of Units (SI) equal to one joule of work performed per second, was called in honour of Watt because of his contributions to science and industry.
Watt's steam engine allowed the steam engine to be utilised to drive rotating equipment in factories like cotton mills, expanding its range of potential uses. It should come as no surprise that Watt's steam engine was in high demand and was swiftly adopted by numerous industries.
His modifications to the steam engine's design transformed it from a water pump for coal mines with few other uses into the source of propulsion that sparked the Industrial Revolution. Rather than being a theorist, Watt is better renowned for his work as an innovator and mechanic.
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A horizontal poly crystalline solar panel module has to be investigated by natural cooling. For crystal silicon, the thermal coefficient approximately 0.0045/K is used. Investigate the effect of air velocity on the cooling performance of PV panels at 0-5 m/s air velocities, 25-40 ºC ambient temperatures, and 400-1000 W/ m2 solar radiation
Answers
Solution :
It is given that :
Thermal coefficient = 0.0045/K
Ambient temperature, \($T_a = 25 - 40^\circ$\)
air velocity, v = 0-5 m/s
Solar radiation, \($G= 400-100 \ W/m^2$\)
\($P=50 \ W$\)
Model calculations :
Cell temperature (\($T_c$\))
\($T_c = T_a + \left(\frac{0.25}{5.7+3.8 \ v_w}\right) G$\)
where \($ v_w - v_a = $\) wind speed / air speed
∴ \($T_c = 2 \pi + \left(\frac{0.25}{5.7+3.8 \times 1}\right) \times 400$\)
\($T_c = 35.526 ^\circ$\)
\($\Delta T = T_c -25$\)
= 35.526 - 25
= 10.526 K
Thermal coefficient = 0.0045 x 10.526
= 0.04737
Pv power = \($(1 -C_T) \times P \times \frac{G}{1000}$\)
\($=(1 -0.04737) \times 50 \times \frac{400}{1000}$\)
= 17.0526 W
Why did the government establish the Federal Deposit Insurance
Corporation (FDIC)?
Answers
The government established the Federal Deposit Insurance Corporation in order to regulate the stability and public confidence in the nation's financial system.
What is the main objective of the FDIC?The fundamental objective of FDIC is to examine and administer financial institutions for standard safety, soundness, and protection of the consumer. It also constructs other large and complex financial institutions with the intention of delivering the solution.
According to the context of this question, FDIC has generally served as an integral domain of the financial system of the nation for more than 50 years. It is typically established by the Banking Act of 1933 at the depth of the most severe banking crisis in the nation's history.
Therefore, the government established the Federal Deposit Insurance Corporation in order to regulate the stability and public confidence in the nation's financial system.
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identify a true statement about the procedure when a claim filed in court that is covered by the mandatory arbitration law is placed in the arbitration track at time of filing
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The court will refer the case to an arbitration service provider to be administered in accordance with the arbitration law.
When a claim is filed in court and covered by the mandatory arbitration law, the court will refer the case to an arbitration service provider to be administered in accordance with the arbitration law. This means that instead of the case being heard in court, it will be heard by an arbitrator. The arbitration process will typically involve both sides presenting their case and the arbitrator will make a binding decision. The court will not be involved in the decision making process and the decision of the arbitrator is final and cannot be appealed. This procedure helps to speed up the dispute resolution process, as well as reduce costs associated with court proceedings.
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The complete question is
identify a true statement about the procedure when a claim filed in court that is covered by the mandatory arbitration law is placed in the arbitration track at time of filing in court
since sprial stairs can be difficult to traverse they are generally allowed as part of the means of egress only within_____.
Answers
Since spiral stairs can be challenging to navigate, they are generally allowed as part of the means of egress only within specific limitations or certain contexts. These limitations depend on the building codes and regulations enforced in a particular jurisdiction. However, it is important to note that my knowledge cutoff is in September 2021, and building codes and regulations can evolve over time. Therefore, it is always advisable to consult the most recent local building codes or consult with a qualified architect or building professional for up-to-date information.
In general, the use of spiral stairs as part of the means of egress is typically limited to low occupant load or for secondary means of egress in certain situations. This is because spiral stairs have a narrower tread width and tighter radius compared to conventional straight stairs, making them more challenging to traverse, particularly for individuals with mobility impairments or during emergency evacuations.
Building codes often specify minimum tread width, riser height, and other requirements to ensure safe and efficient egress. Spiral stairs may be allowed in residential settings, small spaces, or as secondary means of egress in certain occupancies such as storage areas, mezzanines, or limited access spaces.
However, it is crucial to consult the specific building codes applicable to your jurisdiction, as they may provide more precise guidelines and restrictions regarding the use of spiral stairs within means of egress.
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Which of the following is an example of a tax
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Answer:
A tax is a monetary payment without the right to individual consideration, which a public law imposes on all taxable persons - including both natural and legal persons - in order to generate income. This means that taxes are public-law levies that everyone must pay to cover general financial needs who meet the criteria of tax liability, whereby the generation of income should at least be an auxiliary purpose. Taxes are usually the main source of income of a modern state. Due to the financial implications for all citizens and the complex tax legislation, taxes and other charges are an ongoing political and social issue.
I dont know I asked this to
Explanation:
15. Concerning blood, which virus poses the greatest risk for workers?
A) O HIV
B) O Hepatitis C
C) O Hepatitis A
D) O Hepatitis B
Answers
Answer:
I think the answer is A. HIV
A 2*8 inches wood member has a length =11 ft it's density is =30 Lb/ft^3 find the actual weight of this member in Lb
Answers
Answer:
359.046 Ib
Explanation:
density = m / v ---- ( 1 )
m = mass
v = volume = l * b * h
Given data :
density = 30 Ib / ft^3
l = 2 inches = 0.1667 ft
b = 8 inches = 0.6667 ft
h = 11 ft
v ( volume ) = 0.1667 * 0.6667 * 11 = 1.22 ft^3
back to equation 1
m = 30 * 1.22 = 36.6 Ib
Actual weight ( F ) = m * g
= 36.6 * 9.81 = 359.046 Ib.
The reverse leakage current of a transistor when connected to CB configuration is 0.2A and it is 18A when the transistor is connected in CE configuration. Calculate α DC and β of the transistor. 1B=13A
Answers
Answer:
0.988 and 89
Explanation:
1. Asbestos can be dangerous but is not a known carcinogen.
A) O True
B) O False
Answers
Asbestos may cause cancer by inhalation. Moreover, asbestos is also known to cause different respiratory diseases (especially asbestosis) by affecting the mucosa of the bronchi.
The statement "Asbestos can be dangerous but is not a known carcinogen" is FALSE.Asbestos is a group of materials that were widely used in building constructions until 1990.Asbestos is a toxic substance that may cause mesothelioma and lung cancer.Mesothelioma is a type of cancer that develops on the outer surface that covers different internal organs.Moreover, asbestosis is a chronic disease in the lungs caused by long-term exposure to asbestos.Learn more in:
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Answer:
False
Explanation:
Truckco manufactures two types of trucks: 1 and 2. Each truck must go through the painting shop and assembly shop. If the painting shop were completely devoted to painting Type 1 trucks, then 800 per day could be painted; if the painting shop were completely devoted to painting Type 2 trucks, then 700 per day could be painted. If the assembly shop were completely devoted to assembling truck 1 engines, then 1,500 per day could be assembled; if the assembly shop were completely devoted to assembling truck 2 engines, then 1,200 per day could be assembled. Each Type 1 truck contributes $300 to profit; each Type 2 truck contributes $500. How much capacity in percent does a single truck of each type uses at each shop?
Answers
Select the correct answer. What does a mechanical engineer do? O A. Designs buildings. OB. Designs roads. C. Designs consumer products. D. Designs machines,
Answers
Answer:
d
Explanation:
The ans is d, from the word mechanical dealing with machines
Water enters and leaves the 6-cm diameter pipe bend in Fig. P3.45 at an average velocity of 8.5 m/s. The horizontal force to support the bend against momentum change is 300 N. Find (a) the angle ϕ; and (b) the vertical force on the bend.
Answers
Answer:
Water enters and leaves the 6-cm diameter pipe bend in Fig. P3.45 at an average velocity of 8.5 m/s. The horizontal force to support the bend against momentum change is 300 N. Find (a) the angle ϕ; and (b) the vertical force on the bend.
a) The angle \(\phi\) is 62.06°.
b) The vertical force on the bend is 180.47 N.
The weight of the water and the reaction force must be considered to determine the vertical force exerted on the bend. This analysis provides valuable insights into the behavior and structural requirements of the pipe bend in relation to the fluid flow, ensuring its proper functioning and structural integrity.
The objective is to determine two key parameters: the angle of deflection QQ of the pipe bend and the vertical force acting on it. By applying principles of fluid mechanics and equilibrium, the solution requires calculating the change in momentum of the water passing through the bend and equating it to the known horizontal force required to support the bend.
Given that,
The diameter (d)= 6 cm
The average velocity (v)=8.5 m/s
Consider the rate of change of momentum along the x-direction.
\(F_x=mass \times (\frac{Intial \ velocity-Final \ Velocity}{time})\)
\(F_x=m'[(V-(-Vcos\phi)]\)
\(F_x=\rho AV^2[1+cos\phi]\)
\(300=100\times(\frac{\pi}{4}(0.06)^2)\times(8.5)^2[(1+cos\phi)]\)
\([(1+cos\phi)]=1.4685\)
\(cos\phi=0.4685\)
\(\phi=cos^{-1}(0.4685)\)
\(\phi=62.06^{^\circ}\)
(b) Calculate the vertical force on the bend.
Consider the rate of change of momentum along the y-direction.
\(F_y=mass \times (\frac{Intial \ velocity-Final \ Velocity}{time})\)
\(F_y=m'[(0-(V-Vsin\phi)]\)
\(F_y=\rho AVsin\phi\)
\(F_y=(1000)\times(\frac{\pi}{4}(0.06)^2)\times(8.5)^2\times sin62.06^{\circ}\)
\(F_y=180.47 \ N\)
Therefore,
a) The angle \(\phi\) is 62.06°.
b) The vertical force on the bend is 180.47 N.
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Should you prefer rooftop solar panels?
Answers
The rooftop solar is a form of solar energy that can be installed on the roof of a home or business. It is cost-effective, environmentally friendly, and provides many benefits to homeowners and businesses.
The rooftop solar has many advantages over other forms of solar energy. One of the main advantages is that it provides 100% clean electricity from renewable sources. In addition, it can be combined with other sources such as wind power and geothermal power for even more benefits.
There are also many uses for rooftop solar panels in homes and businesses. One example is using it to heat water for hot water systems or heating swimming pools.
For me Bluebird Solar Private Limited is the best website in India for rooftop solar panels in India.
T/F. Documenting position sensitivity enables security personnel to prioritize their activities in accordance with the possible risk and loss
Answers
True. Documenting position sensitivity allows security personnel to prioritize their activities based on the potential risk and loss associated with different positions within an organization.
How to explainBy understanding the sensitivity of various positions, security personnel can allocate their resources effectively and focus their efforts on protecting the most critical areas or individuals.
This assists in customizing security protocols according to the degree of potential threat, enabling optimal allocation of resources. Moreover, the act of recording the level of sensitivity in job positions can aid security staff in spotting weaknesses and enforcing suitable safeguarding strategies to lessen the possible impact of a security violation in positions that pose a considerable threat.
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The reading on the 0 to 25 mm micrometer provided is
A. 15.20
B. 15.70
C. 15.45
D. 0.1520
Answers
Based on the image attached, the reading of micrometer is= 15.20.
What do the numbers on a micrometer represent?You will see a line of numbers running down the barrel of your micrometer, starting with the barrel scale. On the barrel scale, each number corresponds to 0.100. Looking at the barrel, 1 equals 0.100, 2 equals 0.200, 3 equals 300, and so on. The distance between each tick mark and the larger numbers on the barrel is 0.025, or 25 thousandths.
Note that micrometer is one that is also referred to as a micrometer screw gauge—is a tool with a calibrated screw that is frequently used for precise measurement of components in mechanical engineering, and others.
Looking at the image, you will see the stop ends at 15 and and 20 so adding them together will be option A. 15.20.
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which type of contract is specifically and clearly stated?
Answers
A written agreement with specific conditions to which both parties are obliged at the time of formation is known as an express contract. This agreement may be expressed orally or in writing.
What is express contract?An express contract is a promise exchange in which the conditions by which the parties agree to be bound are stated at the moment the promise is made, either verbally, in writing, or in a mix of the two.An express contract is a written agreement with specific conditions that binds both parties at the time it is established. You have the option of an oral or written contract.A contract is created by the use of words, either written or spoken, in an express contract, as opposed to acts in an implicit contract.An implicit contract, which, to review, begins an agreement based on the behaviors of the parties concerned, is sometimes described as the reverse of an express contract.Learn more about express contract refer to :
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