is mediterranean agriculture subsistence or commercial ?
Commercial farming is used in the Mediterranean. Two key goods, wine and olive oil, are made from two important cash crops, grapes and olives.
Is the Mediterranean agricultural sector large?A significant environmental effect of farming in Mediterranean regions is the difficulty of maintaining crops in irrigation during dry summers. Due to annual crop rotations, mechanization, and pesticide use, the majority of Mediterranean agriculture is intensive farming.
Is Mediterranean commercial agriculture highly specialized?The commercial agriculture in the Mediterranean is extremely specialized. It is used on both sides of the Mediterranean Sea in Europe, in North Africa, in Southern California, Central Chile, and in the south-western regions of South Africa. Citrus fruits are a significant export from this area.
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In a series motor, the field electromagnet consists of A) a winding connected in parallel with the armature. B) a winding connected in parallel with the armature and a second winding connected in series with the armature. C) a winding connected in series with the armature. D) a winding connected in series with a separate dc power source.
Answer:
C) a winding connected in series with the armature.
Explanation:
In a series motor, an electromagnet is used as a stator to generate its magnetic field. The field coil of this stator are connected through a commutator in series with the rotor windings. This stator which is the armature windings will conduct AC even on a DC machine, due to the periodically reverses current direction (commutation) or due to electronic commutation (as in brushless DC motors).
as the angle of the ramp is increased the force parallel increases /decreases / remains the same
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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Engine oil (unused) flows at 1.81 x 10^-3 kg/s inside a 1-cm diameter tube that is heated electrically at a rate of 76 W/m. At a particular location where flow and heat transfer are fully developed, the wall temperature is 370K. Determine:
a. The oil mean temperature.
b. The centerline temperature.
c. The axial gradient of the mean temperature.
d. The heat transfer coefficient.
Answer:
(a)Tb = 330.12 K (b)Tc =304.73 K (c)19.81 K/m (d) h =60.65 W/m². K
Explanation:
Solution
Given that:
The mass flow rate of engine oil m = 1.81 x 10^-3 kg/s
Diameter of the tube, D = 1cm =0.01 m
Electrical heat rate, q =76 W/m
Wall Temperature, Ts = 370 K
Now,
From the properties table of engine oil we can deduce as follows:
thermal conductivity, k =0.139 W/m .K
Density, ρ = 854 kg/m³
Specific heat, cp = 2120 J/kg.K
(a) Thus
The wall heat flux is given as follows:
qs = q/πD
=76/π *0.01
= 2419.16 W/m²
Now
The oil mean temperature is given as follows:
Tb =Ts -11/24 (q.R/k) (R =D/2=0.01/2 = 0.005 m)
Tb =370 - 11/24 * (2419.16 * 0.005/0.139)
Tb = 330.12 K
(b) The center line temperature is given below:
Tc =Ts - 3/4 (qs.R/k)= 370 - 3/4 * ( 2419.16 * 0.005/0.139)
Tc =304.73 K
(c) The flow velocity is given as follows:
V = m/ρ (πR²)
Now,
The The axial gradient of the mean temperature is given below:
dTb/dx = 2 *qs/ρ *V*cp * R
=2 *qs/ρ*[m/ρ (πR²) *cp * R
=2 *qs/[m/(πR)*cp
dTb/dx = 2 * 2419.16/[1.81 x 10^-3/(π * 0.005)]* 2120
dTb/dx = 19.81 K/m
(d) The heat transfer coefficient is given below:
h =48/11 (k/D)
=48/11 (0.139/0.01)
h =60.65 W/m². K
At what point should the timing begin for the first leg outbound in a nonstandard holding pattern?A. Abeam the holding fix, or wings level, whichever occurs lastB. when the wings are level at the completion of the 180 turn outboundC. when over or abeam the holding fix whichever occurs later
The correct answer is A, abeam the holding fix, or wings level, whichever occurs last. In a non-standard holding pattern, the aircraft turns in the opposite direction to the standard pattern, and the timing for the first leg outbound begins at a different point.
The timing should begin when the aircraft is abeam the holding fix, or wings level, whichever occurs last.
If the aircraft is still turning when it reaches the holding fix, the timing should begin when the wings are level. By following the correct timing procedures, pilots can ensure safe and efficient operations while maintaining proper spacing and sequencing with other aircraft in the holding pattern.
It's important for pilots to be familiar with both standard and non-standard holding patterns and the associated timing procedures to ensure safety and effective operation of the aircraft.
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The amount of torque produced by the motor , operating at rated voltage and frequency , at the instant the load the motor to stall is called
The amount of torque produced by a motor at the instant the load causes it to stall is called the "stall torque." When a motor operates at its rated voltage and frequency, it is designed to deliver a specific amount of torque to drive the load it is connected to.
Torque is the rotational force exerted by the motor to generate motion or maintain the position of the load. The motor's ability to produce torque depends on factors such as its design, construction, and power supply.
Under normal operating conditions, the motor generates torque that is sufficient to overcome the load and maintain rotation. However, when the load exceeds the motor's torque capability, the motor reaches its maximum torque output, known as the stall torque. At this point, the motor cannot produce enough torque to continue rotating, and it comes to a halt or stalls.
The stall torque is a crucial parameter in motor specifications as it provides information about the motor's ability to handle heavy loads or start-up conditions where a high torque is required. It represents the maximum torque output that the motor can generate when it is unable to overcome the load and maintain rotation.
Motor manufacturers provide stall torque ratings in motor datasheets or technical specifications. It is important to consider the stall torque when selecting a motor for applications where the load demands high starting torque or requires the motor to handle heavy loads without stalling.
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A particular DSL modem operates at 768 kbits/sec. How many bytes can it receive in 1 minute? USB 3.0 can send data at 5 Gbits/sec. How many bytes can it send in 1 minute?
Answer:
a. 1.6 Kbytes/min
b. 10.417 Mbytes/min
Explanation:
a. The DSL modem operates at 768 Kbits/sec.
But,
8 bits = 1 byte and 1 Kbit = 1 000 bits, so that:
= \(\frac{768 000}{8}\)
= 96 000 bytes
Therefore, the modem operates at 96 Kbytes/sec.
The byte to be received in 1 minute can be calculated thus;
Since 60 seconds = 1 minute, then:
= \(\frac{96000}{60}\)
= 1600
= 1.6 Kbytes/min
The modem receives 1.6 Kbytes/min
b. The USB sends 5 Gbits/sec.
But, 8 bits = 1 byte and 1 Gbit = 1000000000 bits so that:
= \(\frac{5000000000}{8}\)
= 625000000
= 0.625 Gbytes
The USB sends 0.625 Gbyte/sec.
Since 60 seconds = 1 minute, then:
= \(\frac{625000000}{60}\)
= 10416666.67
= 10.417 Mbytes/min
providing self-management training is an example of an internal learning condition.
Providing self-management training is an example of an internal learning condition. (False)
What is self-management?Your capacity for effective self-regulation of your actions, thoughts, and emotions is referred to as self-management. This entails performing at the highest level in both your personal and professional responsibilities for the benefit of your team and yourself.
By promoting your self-awareness and wellbeing, effective self-management improves emotional intelligence. This entails being aware of social cues and respecting your own individual needs.
Self-management is a crucial leadership trait that sometimes doesn't come naturally, but you can develop it with the right resources and practice. Let's look at the top seven self-management abilities to master.
Self-management development requires reflection. You need to take a sincere, in-depth look at your own emotional intelligence, self-control, and leadership style to figure out how much self-regulation you actually possess.
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Virtual disks can use thin provisioning, which allocates all configured space on the physical storage device immediately. O True False
Virtual disks can use thin provisioning, which allocates all configured space on the physical storage device immediately. This statement is False.
Thin provisioning is a technique used in storage virtualization that allows virtual disks to be created with a defined capacity, but the actual physical storage space is only allocated as needed. This means that the virtual disk appears to have the full capacity allocated to it, but the physical storage is only used as data is written to the virtual disk.
This is in contrast to thick provisioning, where all of the physical storage is allocated upfront when the virtual disk is created, regardless of how much space is actually needed. Thick provisioning can result in wasted storage space and can make it more difficult to manage storage resources efficiently.
Therefore, the statement "Virtual disks can use thin provisioning, which allocates all configured space on the physical storage device immediately" is false.
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The moment of inertia is a geometric property of a structural
element. Describe how it can be altered and
how it influences the stress due to bending in a beam.
Moment of Inertia is the measure of a structure's resistance to rotation. It is the integral sum of an element's mass and its distance from the axis of rotation.
A moment of inertia can be changed by adjusting the shape of a structure to change the distance of mass from the axis of rotation. A structure's moment of inertia is proportional to the stress due to bending.
A structure with a higher moment of inertia will have a lower stress due to bending than a structure with a lower moment of inertia. A beam's moment of inertia is dependent on its shape.
Rectangular, circular, or I-beam shapes are popular for their ability to handle bending stress. Wider beam shapes distribute bending stress more evenly over the beam's cross-sectional area, resulting in a lower bending stress.
I-beams are designed with a high moment of inertia to resist bending, making them a popular choice for construction. A higher moment of inertia ensures a stronger beam that can better resist bending stress.
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Which of the following occupations is the most physically dangerous?
O electrician
O Ironworker
O boilermaker
O cement mason
Answer:Ironworker
Explanation:
Their work is totally physical and lead they get hampered by lead most
Answer:
answer:ironworker
Explanation:
they can be hampered and can also get severely injured.
Of the soil orders listed below, which would be the least weathered and developed? a.Mollisols. b.Entisols. c.Alfisols. d.Aridisols.
The soil order which would be the least weathered and developed among the given soil orders is b. Entisols.
An entisol is a young soil that does not have a well-established soil profile. It is the least developed of all the soil orders. Entisols are often found in areas that are recently formed or where erosion is high. They are typically found in areas with recent geological processes, such as recently deposited sediment. They are also found in areas with high rates of erosion or weathering. Entisols are usually low in organic matter and nutrients. They are also often very shallow, with little or no soil horizons. The soil order has little weathering, and it has low development, making it the least developed of all the soil orders
Soils are complex systems that are critical for agriculture, biodiversity, and ecosystem function. They support plant growth by providing nutrients, water, and support for roots. Soil formation is a slow and complex process that can take thousands of years. Soil formation depends on several factors, including climate, geology, vegetation, and time.Soil orders are classifications of soils based on their properties. Each soil order has unique characteristics that reflect its formation and development. The United States Department of Agriculture (USDA) has developed a soil taxonomy system that categorizes soils into 12 soil orders. Each soil order has unique properties that reflect its formation and development.The least developed of all the soil orders is Entisols. It is a young soil that does not have a well-established soil profile. Entisols are typically found in areas with recent geological processes, such as recently deposited sediment. They are also found in areas with high rates of erosion or weathering. Entisols are usually low in organic matter and nutrients. They are also often very shallow, with little or no soil horizons. The soil order has little weathering, and it has low development, making it the least developed of all the soil orders.
The soil order that would be the least weathered and developed among the given soil orders is b. Entisols.
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Witch type of wetland has shollow water or streams.
Calculate moments about points A,B,C,D
Answer:
24cm sureeeereereeeeee
consider a stokes flow due to a sphere rotating near a wall, argue from kinematic reversibility weather or not the rotating sphere will experience a force pushing it away or drawing it into the wall
In Stokes flow, the fluid velocity is proportional to the forces acting on the fluid and the fluid is assumed to be viscous and incompressible. The fluid velocity near a rotating sphere in Stokes flow can be determined using the equations of fluid dynamics.
What is the reversibility about?Kinematic reversibility is a property of Stokes flow, which states that the fluid flow is symmetric with respect to time reversal. This means that if the fluid velocity is recorded at a certain time, then the same velocity field will be obtained if time is reversed and the flow is replayed in the reverse direction.
When a sphere is rotating near a wall, the flow of fluid around the sphere creates a velocity field that pushes the sphere away from the wall. This flow can be considered as the fluid being pushed away from the sphere and towards the wall. If the flow is time-reversed, the fluid velocity field would be the same, but the direction of the velocity would be reversed. This means that the fluid would be drawn towards the sphere and away from the wall, pulling the sphere towards the wall.
Therefore, based on the property of kinematic reversibility in Stokes flow, the rotating sphere near a wall will experience a force that could either push it away from the wall or draw it towards the wall, depending on the direction of the flow.
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How can a company distinguish between fully certified engineers and those who are not qualified?
Consider a router that interconnects three subnets: Subnet 1, Subnet 2, and Subnet 3. Suppose all of the interfaces in each of these three subnets are required to have the prefix 223.1.17/24. Also suppose that Subnet 1 is required to support up to 63 interfaces, Subnet 2 is to support up to 95 interfaces, and Subnet 3 is to support up to 16 interfaces. Provide three network addresses (of the form a.b.c.d/x) that satisfy these constraints.
Three network addresses that would meet the above criteria are:
Subnet 1: 223.1.17.0/25Subnet 2: 223.1.17.128/26Subnet 3: 223.1.17.192/28.What is a network address?A network address is a unique identifier for a node or host on a computer network. Network addresses are intended to be unique identifiers throughout the network, while some networks allow for non-unique local, private, or locally governed addresses.
It is to be noted that the above network addresses are chosen based on the requirements that each subnet must have the prefix 223.1.17/24 and must support a certain number of interfaces.
The number of bits borrowed from the host portion of the address to create the subnet prefix (also known as the "subnet mask") is chosen such that each subnet can support the required number of interfaces.
In the case of Subnet 1, the subnet mask /25 borrows 7 bits from the host portion of the address, leaving the subnet with 2⁷ = 128 possible host addresses. Since only 63 interfaces are required, this is sufficient to meet the requirement.
In the case of Subnet 2, the subnet mask /26 borrows 6 bits from the host portion, leaving the subnet with 2⁶ = 64 possible host addresses.
In the case of Subnet 3, the subnet mask /28 borrows 4 bits from the host portion, leaving the subnet with 2⁴ = 16 possible host addresses. Since only 16 interfaces are required, this is adequate to meet the requirement.
Overall, the network addresses provided above satisfy the constraints described in the question and allow each subnet to support the required number of interfaces.
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the code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. choose yes (switch required) or no (switch not required) for the following areas:
The code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. a. Yes b. Yes
According to the Code, switched lighting outlets or switched receptacles are required in certain areas of a dwelling. Based on the given areas:
a. Attic (not intended for storage): Yes, a switched lighting outlet or switched receptacle is required for safety and convenience when accessing the attic space.
b. Stairway: Yes, a switched lighting outlet or switched receptacle is required to ensure proper illumination for safe navigation on the stairs.
c. Crawl space (contains equipment that requires servicing): No, a switched lighting outlet or switched receptacle may not be required in a crawl space unless specified by the Code or local regulations.
d. Hallway: Yes, a switched lighting outlet or switched receptacle is typically required in hallways for proper lighting and convenience.
e. Bathroom: Yes, a switched lighting outlet or switched receptacle is required in the bathroom for both lighting and electrical appliance use.
It's important to note that specific building codes and regulations may vary depending on the jurisdiction, so it is always advisable to consult the applicable local codes or consult with a qualified professional to ensure compliance with the specific requirements for switched lighting outlets or switched receptacles in each area of a dwelling.
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Complete Question
The Code specifies which rooms in a dwelling are required to have switched lighting outlets or switched receptacles. Choose yes (switch required) or no (switch not required) for the following areas:
a. Yes
b. No
Attic (not intended for storage
Stairway
Crawl space (contains equipment that requires servicing)
Hallway
Bathroom
Explain how the horsepower of a sports car can be improved.
Answer:
with turbo or nos
Explanation:
What should a company do to develop a better data culture?
Answer:
Some good ways and popular ways are:
1. Investing in data literacy.
2. Think about cybersecurity.
3. Choosing good and the right tools.
4. Establish metrics that matter.
Explanation:
These all are helpful.
(Hope this helped! Have a great day.)
Technician a says that only manufacturers offer vehicle warranties. technician b says that aftermarket warranties are available for consumers to purchase. which technician is correct?
Based on the information provided, the technician who is correct is Technician B only.
What is an extended warranty contract?An extended warranty contract is sometimes referred to as an aftermarket warranty and it can be defined as an elongation of the coverage period on a service agreement that was entered between a manufacturer and the customer (consumers).
Generally, some of the characteristics and features of an extended warranty contract include the following:
An extended warranty contract provides protection beyond the manufacturer's original warranty.An extended warranty contract constitutes a separate performance obligation.An extended warranty contract is available for consumers to purchase.Based on the information provided, we can reasonably infer and logically deduce that the technician who is correct is Technician B only.
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providing the three principal stresses of a point are 10mpa, 2mpa, -4mpa, what is the equivalent stress at that point?
When three principal stresses are given, the equivalent stress at the point can be calculated using the following formula:σe = [(σ1-σ2)² + (σ2-σ3)² + (σ3-σ1)²]^(1/2)where,σ1, σ2, and σ3 are the principal stresses.
In this case, the given principal stresses are 10MPa, 2MPa, and -4MPa. Therefore,σ1
\(= 10MPaσ2 = 2MPaσ3 = -4MPaSubstituting these values in the above formula, we get:σe = [(10-2)² + (2-(-4))² + (-4-10)²]^(1/2)= [(8)² + (6)² + (14)²]^(1/2)= [64 + 36 + 196]^(1/2)= [296]^(1/2)≈ 17.2\) MPaTherefore, the equivalent stress at the point is approximately 17.2 MPa.
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determine the forces in members bc and fg of the loaded symmetrical truss. show that this calculation can be accomplished by using one section and two equations, each of which contains only one of the two unknowns.
The forces in members BC and FG of the loaded symmetrical truss can be determined by using one section and two equations, each of which contains only one of the two unknowns.
What is Force?
A force is an effect that can alter an object's motion according to physics. A force can cause an object with mass to accelerate when it changes its velocity, for as when it moves away from rest. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction. It is calculated using the newton SI unit (N). Force is denoted by the letter F. (formerly P).
The net force acting on an object is equal to the rate at which its momentum varies over time, according to Newton's second law in its original formulation.
The forces in members BC and FG of the loaded symmetrical truss can be determined by using one section and two equations, each of which contains only one of the two unknowns. By using the section, the force in member BC can be determined. By using the equation, the force in member FG can be determined.
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What does the nec section 420. 6 (a) state that the tables are not used for?
Section 420.6(a) of the National Electrical Code (NEC) states that the tables should not be used for calculating the maximum number of conductors that can be installed in various raceway and cable types.
It is a standard of practice for the safe installation of electrical wiring and equipment in the United States. The NEC is updated every three years to reflect the most up-to-date electrical safety practices.In 2020, the latest NEC was released. The NEC contains regulations for everything from electrical wire size to electrical panel installation. Its goal is to ensure the safe installation of electrical systems in both residential and commercial settings.
Section 420.6(a) is part of Article 420 of the NEC, which covers installation standards for electrical equipment used in a hazardous (classified) location. Hazardous locations are areas where combustible gases, vapors, dusts, or fibers exist in concentrations that could cause a fire or explosion if a source of ignition were present. Section 420.6(a) of the NEC states that the tables used to determine the maximum number of conductors that can be installed in various raceway and cable types should not be used for calculating.
The tables are not a substitute for proper engineering calculations when designing an electrical system. This means that the tables should be used as a general guide, but not as the only means of determining the maximum number of conductors that can be installed.
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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. Provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20 ℃ throughout the year, while the walls of the room are nominally at 27 ℃ and 14 ℃ in the summer and winter, respectively. The exposed surface of a person in the room may be assumed to be at a temperature of 32 ℃ throughout the year and to have an emissivity of 0.90. The coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 W/m2∙K.
Answer:
radiative heat loss substantially increases as the wall temperature declines
Explanation:
The body's heat loss due to convection is ...
(2 W/m^2·K)((32 -20)K) = 24 W/m^2
__
The body's heat loss due to radiation in the summer is ...
\(\epsilon\sigma(T_b^4-T_w^4)\quad\text{where $T_b$ and $T_w$ are body and wall temperatures ($^\circ$K)}\\\\0.90\cdot 5.6703\cdot 10^{-8}(305.15^4-300.15^4)\,\text{W/m$^2$}\\\\\approx 28.3\,\text{W/m$^2$}\)
The corresponding heat loss in the winter is ...
\(0.90\cdot 5.6703\cdot 10^{-8}(305.15^4-287.15^4)\,\text{W/m$^2$}\\\\\approx 95.5\,\text{W/m$^2$}\)
Then the total of body heat losses to surroundings from convection and radiation are ...
summer: 24 +28.3 = 52.3 . . . W/m^2
winter: 24 +95.5 = 119.5 . . . W/m^2
__
It is reasonable that a person would feel chilled in the winter due to the additional radiative loss to the walls in the winter time. Total heat loss is more than doubled as the wall temperature declines.
What would happen if an exposed film was accidentally placed in the fixer before being placed in the developer
When the process is in control but does not meet specification which type of error is it?
When the process is in control but does not meet specification, it is referred to as a special cause error.
What is the term for a process in control but not meeting specification?In statistical process control, a process is considered to be in control when it operates within the defined limits and shows only random variations. However, when a process is in control but does not meet the desired specifications, it indicates the presence of a special cause error.
Special cause errors are attributed to specific factors or events that cause the process to deviate from the expected outcome. These errors are typically unpredictable and require investigation and corrective action to bring the process back within the desired specifications.
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How does concurrent engineering speed up product development?
A. The product and process are designed using computer-aided design.
B. The product and process are designed in series.
C. The product and process are designed in separate spaces.
D. The product and process are designed simultaneously.
Answer:
The product and process are designed simultaneously
Explanation:
PENN
A coil having resistance of 7 ohms and inductance of 31.8 mh is connected to 230v,50hz supply.calculate 1. The circuit current 2.the phase angle, 3.power factor, 4 the power consumed
(1) The current in the circuit is 18.87 A,
(2) The phase angle is 54.97°
(3) The power factor is 0.574
(4) The power consumed is 2491.2 W
(1) To calculate the current in the circuit, first, we need to find the overall impedance of the circuit.
We can calculate the overall impendence of the circuit using the formula below.
Z = √[R²+(2πfL)²]........................ Equation 1Where:
R = resistance of the coilf = FrequencyL = Inductance of the coilZ = Overall impedance of the circuitFrom the question,
Given:
R = 7 ohmsL = 31.8 mH = 0.0318 Hf = 50 Hzπ = 3.14
Substitute these values into equation 1
Z = √[7²+(2×3.14×50×0.0318)²]Z = √(49+99.7)Z = √(148.7)Z = 12.19 ohms.Therefore we use the formula below to calculate the current in the circuit.
I = V/Z.................. Equation 2Where:
V = VoltageI = current in the circuit.Given:
V = 230 V.Substitute into equation 2
I = 230/12.19I = 18.87 A(2) To calculate the phase angle, we use the formula below.
∅ = tan⁻¹(2πfL/R)............... Equation 3Where:
∅ = Phase angle.
Substitute into equation 3
(3) To calculate the power factor, we use the formula below.
pf = cos∅............ Equation 4Where:
pf = power factor.Substitute the value of ∅ into equation 4
pf = cos(54.97°)pf = 0.574.
(4) And Finally to calculate the power consumed we use the formula below.
P = V×I×pf................ Equation 5Where:
P = The power consumedSubstitute the values into equation 5
P = 230(18.87)(0.574)P = 2491.22 W
Hence, (1) The current in the circuit is 18.87 A, (2) The phase angle is 54.97° (3) The power factor is 0.574 (4) The power consumed is 2491.2 W
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... is an actual sequence of interactions (i.e., an instance) describing one specific situation; a ... is a general sequence of interactions (i.e., a class) describing all possible ... associated with a situation. ... are used as examples and for clarifying details with the client. ... are used as complete descriptions to specify a user task or a set of related system features.
Answer:
ScenarioUse caseScenariosScenariosUse caseExplanation:
A scenario is an actual sequence of interactions (i.e., an instance) describing one specific situation; a use case is a general sequence of interactions (i.e., a class) describing all possible scenarios associated with a situation. Scenarios are used as examples and for clarifying details with the client. Use cases are used as complete descriptions to specify a user task or a set of related system features.