A four-cylinder, four-stroke internal combustion engine operates at 2800 RPM. The processes within each cylinder are modeled as an air-standard Otto cycle with a pressure of 14.7 lbf/in. 2 , a temperature of 80 8 F, and a volume of 0.0196 ft 3 at the beginning of compression. The compression ratio is 10, and maximum pressure in the cycle is 1080 lbf/in.Write possible Assumptions no less than three assumptionsDetermine, using a cold air-standard analysis with k 5 1.4, the power developed by the engine, in horsepower, and the mean effective pressure, in lbf/in.

Answer:

(c) electronic

Explanation:

for pf, this is correct....Here is the sentence from the pf lesson

" The primary energy source for the controller within buildings is typically electric, pneumatic, or

electronic

."

For servicing ammonia absorption systems, it is important that the gauge manifold, valves, lines, and fittings used should never be made of copper or copper alloys.

Ammonia is highly reactive with copper, and prolonged exposure to ammonia can lead to a chemical reaction known as ammoniacal corrosion. This corrosion can result in the formation of copper ammonia complexes, which are unstable and can decompose explosively.

To prevent the risk of ammoniacal corrosion and potential hazards associated with it, materials such as copper or copper alloys should be avoided in contact with ammonia. Instead, materials such as stainless steel, brass, or other compatible non-ferrous alloys are commonly used for components in ammonia systems. These materials have a higher resistance to ammoniacal corrosion and can withstand the demands of ammonia service conditions more effectively.

Using the correct materials is crucial for ensuring the safety and reliability of ammonia absorption systems during servicing and operation.

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Answer:

pay attention in class how about that

Explanation:

thats the answer

The solution that overall has the lowest cost is the one with two maintenance centers, which has an optimal cost of $9,617.20.

Cost = 5*[(27.5-0)*30 + sqrt((27.5-20)² + (30-10)²)*12 + sqrt((27.5-40)² + (30-50)²)*25 + (50-27.5)*20] = $13,985.17Number of possible ways to allocate the machines across two maintenance centers:For two maintenance centers, there are 14 ways to allocate the machines. Since there are four machines, there are C(4,2) = 6 ways to choose the two machines allocated to the first center. Once the two machines are assigned to the first center, the remaining two machines must be assigned to the second center. There are C(2,2) = 1 ways to do that. Thus, there are 6*1 = 6 ways to assign the machines to the first center. For the remaining two machines, there are C(2,1) = 2 ways to choose which one goes to which center. Therefore, the total number of ways is 6*2 = 12.

Therefore, the optimal locations if there will be two maintenance centers are (16.93, 30) and (41.07, 30).Optimal cost if there are two maintenance centers:The optimal cost if there are two maintenance centers can be found by calculating the total transportation cost from each machine to its assigned center and then adding the annual cost of owning and operating two centers, which is $10,000. Thus, the optimal cost if there are two maintenance centers is as follows:Cost = 5*[(16.93-0)*30 + sqrt((16.93-20)² + (30-10)²)*0 + sqrt((16.93-40)² + (30-50)²)*25 + (50-16.93)*20] + 5*[sqrt((41.07-20)² + (30-10)²)*12 + sqrt((41.07-50)² + (30-50)²)*0 + sqrt((41.07-40)² + (30-50)²)*0 + (41.07-0)*30] + 10000 = $9,617.20Solution that overall has the lowest cost

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The core loss component​ is 250W.

The term core loss refers to the total energy lost in the production of heat. Core loss is the loss due to the changing magnetization of the magnetic core, which is the sum of hysteresis loss and eddy current loss.

Core losses have two main causes ohmic or Joule heating caused by eddy currents induced by a changing magnetic field in a conducting medium, and losses due to cyclic reversals of magnetization in ferromagnetic materials, which are proportional to the area of ​​the magnet. field hysteresis loop. Core loss is often measured using the Epstein frame method, which includes a primary and secondary coil.

therefore , by using this formula core loss can be calculated as

W =\(V_{1} I_{0}\)cosФ₀

= 250x 4x 0.25

= 250W.

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The statement "In a regular pyramid, the slant height is always longer than a lateral edge of the pyramid" is false.

In a regular pyramid, the slant height refers to the distance from the apex (top) of the pyramid to any point on the lateral face, measured along the slanted surface. A lateral edge, on the other hand, refers to the length of an edge that connects the apex to a vertex of the base.

In a regular pyramid, the slant height and the lateral edge are typically not equal to each other. The slant height is generally longer than a lateral edge. This can be understood by considering the shape of a regular pyramid, where the slant height forms a diagonal along the lateral face, while the lateral edge is a straight line connecting the apex and a vertex of the base.

However, it is important to note that the specific lengths of the slant height and lateral edge depend on the dimensions of the pyramid, such as the base size and the height. The relationship between the slant height and lateral edge can vary depending on the specific measurements of the regular pyramid.

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Their HVACR technician advises against it because of the residential energy costs from HVAC units.

hat is the cost energy?

Energy Cost is known to be a term that connote the cost of electricity and this is one that is often related to fuel oil, gasoline, heating oil, natural gas, as well as other kinds or source of energy linked to any operation.

Hence, Since family in Florida heard about evaporative coolers as a way to cool their home without the expenses of a refrigerated air conditioning system. Their HVACR technician advises against it because of the residential energy costs from HVAC units.

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Answer:

Mass, in physics, quantitative measure of inertia, a fundamental property of all matter.

Explanation:

Mass is the matter that makes up objects

The current in the circuit would be approximately 10,958.33 A.

Ohm's law states that the "current in a circuit is equal to the voltage applied to the circuit divided by the total resistance of the circuit".

To solve this problem, we need to first determine the total resistance of the two resistive heating elements in the circuit.

Since the heating elements are connected in series, their resistances add up, so the total resistance of the circuit is

⇒ 2 x 2.8 kW / 250 V = 11.2 kW / 250 V = 0.0448 kW / V.

As per Ohm's law, the current in the circuit would be

⇒ 492 V / 0.0448 kW / V = 10,958.33 A.

Therefore, the current in the circuit would be approximately 10,958.33 A.

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Answer:

The answer is "F".

Hope this helped!

The regenerative Rankine cycle has a number of advantages over the simple Rankine cycle, such as Higher thermal efficiency, Lower exhaust, and Smaller physical size, Shorter startup time.

Higher thermal efficiency as the steam is recycled back to the boiler, resulting in higher efficiency and better fuel economy. Lower exhaust steam pressure and temperature, making it more suitable for applications with lower temperature differences between the heat source and the sink. Shorter startup time as the turbine does not require as much steam to reach operating conditions. Smaller physical size, as the high pressure and temperature equipment, is not necessary.

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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.

The first step you should take when spotting a fire that appears to be spreading rapidly in the workplace is to leave the area immediately, closing the fire door behind you. The correct option is B. Leave the area immediately, closing the fire door behind you.

This is because your safety should be your top priority, and trying to fight the fire could put you in danger. By leaving the area and closing the fire door behind you, you can help contain the fire and prevent it from spreading further. You should then proceed to the nearest exit and evacuate the building, alerting others as you go. Once you are safely outside, call the fire department and inform them of the situation. The correct option is B. Leave the area immediately, closing the fire door behind you.

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Answer:

The answer is false, I hope this helps. :3

Answer:

False

Explanation:

I took the quiz and it was correct

To drill a hole with a square cross-section, 0.25 inch on a side and 1-inch deep in a steel workpiece, the appropriate process would be (g) wire EDM.

Wire EDM (Electrical Discharge Machining) is a precision machining process that uses a thin, electrically conductive wire to cut through the workpiece. It is commonly used for complex shapes and intricate profiles, including holes with non-traditional cross-sections.

Wire EDM works by creating an electrical discharge between the wire electrode and the workpiece. The controlled spark erosion generated by the electrical discharge gradually removes material from the workpiece, forming the desired shape.

In the case of a square hole, a wire EDM machine can be programmed to cut along the desired path, precisely removing material to create a square cross-section. The wire can be guided in multiple directions, allowing for the creation of holes with different cross-sectional shapes.

Wire EDM is known for its high precision and accuracy, making it suitable for machining intricate shapes in hard materials like steel. It can achieve tight tolerances and excellent surface finishes. Additionally, wire EDM does not exert significant mechanical force on the workpiece, minimizing the risk of deformation or damage.

Thus, the correct option is "e".

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The correct response is E. 39. The maximum angle that the ladder can make with the floor before it slips is 39.

solitary-pole ladders Ladders that extend (maximum length 15 metres) Ladders, Step (maximum height 6.1 metres) Given that you shouldn't be standing on the top three treads of the leaning ladder, a single-story home with a height of at least 4 meters would be suitable. You would require an extension ladder with an extension of about 7 meters for a two-story residence. The short answer is no, leaning a ladder against a gutter is not safe. "For a leaning ladder, you should secure it and have a sturdy top resting point, i.e. do not rest a ladder against weak upper surfaces." It is not a good idea to lean your ladder against a gutter as the gutter could not be strong enough to hold it.

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A 100-N uniform ladder, 8.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.40. What minimum angle can the ladder make with the floor before it slips?

A. 42

B. 22

C. 18

D. 51

E. 39

Answer: Why is even here then.

Explanation:

Answer:

I think the answer is d: underground tunnel

Explanation:

Hope this helps

The pressure a submersible drone would need to withstand 7 miles is given to be 114.49 MPA

Wer have P = rho x H

Where Rho s is the Sp x the weight of the sea water

= 10163 . 16n/m²

We are to proceed to find the value of H

H = 7. 0 miles below sea water

= 11265.408m

P = 11265.408m x 10163 . 16n/m²

= 114,492.144

= 114.49 MPA

Hence we can say that  the pressure of the submersible drone should be equal to 114.49 MPA

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Answer:

  use the percentage error relation

Explanation:

The percentage error in anything is computed from ...

  %error = ((measured value)/(accurate value) -1) × 100%

__

The difficulty with voltage measurements is that the "accurate value" may be hard to determine. It can be computed from the nominal values of circuit components, but there is no guarantee that the components actually have those values.

Likewise, the measuring device may have errors. It may or may not be calibrated against some standard, but even measurement standards have some range of possible error.

Answer:

use the percentage error relation

Answer:

When two fair dice are rolled, 6×6=36 observations are obtained.

P(X=2)=P(1,1)=

36

1

​

P(X=3)=P(1,2)+P(2,1)=

36

2

​

=

18

1

​

P(X=4)=P(1,3)+P(2,2)+P(3,1)=

36

3

​

=

12

1

​

P(X=5)=P(1,4)+P(2,3)+P(3,2)+P(4,1)=

36

4

​

=

9

1

​

P(X=6)=P(1,5)+P(2,4)+P(3,3)+P(4,2)+P(5,1)=

36

5

​

P(X=7)=P(1,6)+P(2,5)+P(3,4)+P(4,3)+P(5,2)+P(6,1)=

36

6

​

=

6

1

​

P(X=8)=P(2,6)+P(3,5)+P(4,4)+P(5,3)+P(6,2)=

36

5

​

P(X=9)=P(3,6)+P(4,5)+P(5,4)+P(6,3)=

36

4

​

=

9

1

​

P(X=10)=P(4,6)+P(5,5)+P(6,4)=

36

3

​

=

12

1

​

P(X=11)=P(5,6)+P(6,5)=

36

2

​

=

18

1

​

P(X=12)=P(6,6)=

36

1

​

Therefore, the required probability distribution is as follows.

Then, E(X)=∑X

i

​

⋅P(X

i

​

)

=2×

36

1

​

+3×

18

1

​

+4×

12

1

​

+5×

9

1

​

+6×

36

5

​

+7×

6

1

​

+8×

36

5

​

+9×

9

1

​

+10×

12

1

​

+11×

18

1

​

+12×

36

1

​

=

18

1

​

+

6

1

​

+

3

1

​

+

9

5

​

+

6

5

​

+

6

7

​

+

9

10

​

+1+

6

5

​

+

18

11

​

+

3

1

​

=7

E(X

2

)=∑X

i

2

​

⋅P(X

i

​

)

=4×

36

1

​

+9×

18

1

​

+16×

12

1

​

+25×

9

1

​

+36×

36

5

​

+49×

6

1

​

+64×

36

5

​

+81×

9

1

​

+100×

12

1

​

+121×

18

1

​

+144×

36

1

​

=

9

1

​

+

2

1

​

+

3

4

​

+

9

25

​

+5+

6

49

​

+

9

80

​

+9+

3

25

​

+

18

121

​

+4

=

18

987

​

=

6

329

​

=54.833

Then, Var(X)=E(X

2

)−[E(X)]

2

=54.833−(7)

2

=54.833−49

=5.833

∴ Standard deviation =

Var(X)

​

=

5.833

​

=2.415

To determine the smallest value of load resistance that can be used with the filter components in part e while maintaining the cutoff frequency within a 5% difference from the unloaded filter, we need to consider the impact of the load resistance on the filter's characteristics.

The cutoff frequency of a filter is primarily determined by the values of the passive components, such as resistors and capacitors, used in the circuit. The load resistance, however, can affect the filter response by introducing additional loading and altering the impedance characteristics.

In order to maintain the cutoff frequency within a 5% difference, it is generally recommended to keep the load resistance much larger than the output impedance of the filter. This helps to minimize the loading effect and maintain the desired filter response.

The specific value of the load resistance will depend on the design parameters, component values, and desired cutoff frequency of the filter in part e. Without knowing the specific details of the circuit, it is not possible to determine the exact value of the load resistance in this case. Detailed analysis and calculations based on the circuit's specifications would be required to determine the smallest load resistance value while meeting the given criteria.

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To pack A into B and store the result in C, the following operations can be performed.

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Answer:

Answer:

You didn't write full questions

Explanation:

Where are options? You say following but there is no any option

Answer:

The correct answer is "Building automation system (BAS)".

A Building Automation System (BAS) is responsible for maximizing building efficiency by managing all of a building's electrical and mechanical operations. BAS uses a network of sensors, controllers, and software to monitor and control various building systems, including heating, ventilation, air conditioning, lighting, and security.

BAS is designed to optimize building performance by automating routine tasks, responding to changing conditions, and identifying and addressing problems before they become critical. By providing real-time data and analytics, BAS allows building managers to make informed decisions about energy usage, equipment maintenance, and system upgrades.

Overall, BAS helps building owners and managers to reduce energy consumption, lower operating costs, and improve occupant comfort and safety. It is an essential component of modern building design and management, and plays a critical role in achieving sustainable and efficient building operations.

Answer:

i hope it's correct

Explanation:

A thermal boundary layer will not develop in flow over a surface if both the fluid and the surface are at the same temperature since there will be no heat transfer in that case.

Answer:

Supervision, enables the Coach to: Keep a questioning and reflective eye on the work that they are doing. Work with another to help them extend their perspective supporting the development of their own 'Internal Coach' Access support and challenge that is needed to help the coach continue to grow and develop.

Explanation:

SUPERVISION – SIGNIFICANCE

Supervision is primarily concerned with overseeing or watching the performance of workers under his control. He plays an important role in the management set up. He is the person who is directly connected with the workers and acts as a vital link between the management and workers.

The given statement about Incident reports is; True

Incident reports are tools that documents any event that may or may not have caused injuries to a person or damage to a company asset.

Incident reports are used to capture injuries and accidents, near misses, property and equipment damage, health and safety issues, security breaches and misconducts in the worksite.

Thus, the given statement about Incident reports is true.

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