Answer:
zzzzzzzzzzzzzzzzzzzzzzzz
A classroom that normally contains 40 people is to be air-conditioned with window air conditioning units of 5-kW cooling capacityeach. A person at rest may be assumed to dissipate heat at the rate of about 360 kJ/hr.There are 10 light bulbs in the room,each with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/hr. Ifthe room air is to be maintained at a constant temperature, determine the number of window air conditioning units required.
Answer:
The correct answer will be "2".
Explanation:
Given:
Heat generated through wall,
= 15000 kJ/h
= \(\frac{15000}{3600}\)
= \(4.17 \ KW\)
Heat generated by bulbs,
= \(10(100) \ W\)
= \(1000\)
= \(1 \ KW\)
Heat generated by people,
= \(40(360) \ KJ/h\)
= \(\frac{14400}{3600}\)
= \(4 \ KW\)
Heat removed by 1 AC,
= 5 KW
Now,
The total increase in heat will be:
= \(4+1+4.17\)
= \(9.17 \ KW\)
hence,
The required number of AC will be:
⇒ \(5n=9.17\)
⇒ \(n=\frac{9.17}{5}\)
⇒ \(=1.83\)
0r,
⇒ \(2\)
A wastewater treatment plant has a flow of 35,000 m3 /day. Calculate the mass of sludge wasted each day (QwXw, expressed in kg/day) for an activated-sludge system operated at a solids retention time (SRT) of 5 days. Assume an aeration tank volume of 1,640 m3 and an MLSS concentration of 2,000 mg/L.
Answer:
sorry di ko alam
Explanation:
Convert the following decimal numbers to 8-bit two's complement numbers or indicate that the decimal number would overflow the range. (a) 4210 (b) −6310
The conversions for the given numbers are: (a) 42 converts to 00101010, and (b) -63 converts to 11000001.
Convert decimal numbers to 8-bit two's complement: (a) 42, (b) -63.To convert decimal numbers to 8-bit two's complement representation, we first check if the number is within the range of -128 to 127 (for 8-bit signed representation).
For the decimal number 42, it is within the range, so we convert it to binary by representing its absolute value in binary and adding leading zeros to make it 8 bits. In this case, the binary representation is 00101010.
For the decimal number -63, it is also within the range. To represent negative numbers in two's complement, we first find the binary representation of the absolute value, which is 00111111.
Then, we flip the bits (complement) to get 11000000 and add 1 to the result. Thus, the 8-bit two's complement representation of -63 is 11000001.
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Determine the enthalpy, volume and density of 1.0 kg of steam at a pressure of 0.5 MN/m2 and with a dryness fraction of 0.96
Answer:
Enthalpy, hsteam = 2663.7 kJ/kg
Volume, Vsteam = 0.3598613 m^3 / kg
Density = 2.67 kg/ m^3
Explanation:
Mass of steam, m = 1 kg
Pressure of the steam, P = 0.5 MN/m^2
Dryness fraction, x = 0.96
At P = 0.5 MPa:
Tsat = 151.831°C
Vf = 0.00109255 m^3 / kg
Vg = 0.37481 m^3 / kg
hf = 640.09 kJ/kg
hg = 2748.1 kJ/kg
hfg = 2108 kJ/kg
The enthalpy can be given by the formula:
hsteam = hf + x * hfg
hsteam = 640.09 + ( 0.96 * 2108)
hsteam = 2663.7 kJ/kg
The volume of the steam can be given as:
Vsteam = Vf + x(Vg - Vf)
Vsteam = 0.00109255 + 0.96(0.37481 - 640.09)
Vsteam = 0.3598613 m^3 / kg
From the steam table, the density of the steam at a pressure of 0.5 MPa is 2.67 kg/ m^3
A triangular plate with a base 5 ft and altitude 3 ft is submerged vertically in water. If the base is in the surface of water, find the force against onr side of the plate. Express the hydrostatic force against one side of the plate as an integral and evaluate it. (Recall that the weight density of water is 62.5 lb/ft3.)
Answer:
Hydrostatic force = 41168 N
Explanation:
Complete question
A triangular plate with a base 5 ft and altitude 3 ft is submerged vertically in water so that the top is 4 ft below the surface. If the base is in the surface of water, find the force against onr side of the plate. Express the hydrostatic force against one side of the plate as an integral and evaluate it. (Recall that the weight density of water is 62.5 lb/ft3.)
Let "x" be the side length submerged in water.
Then
w(x)/base = (4+3-x)/altitude
w(x)/5 = (4+3-x)/3
w(x) = 5* (7-x)/3
Hydrostatic force = 62.5 integration of x * 4 * (10-x)/3 with limits from 4 to 7
HF = integration of 40x - 4x^2/3
HF = 20x^2 - 4x^3/9 with limit 4 to 7
HF = (20*7^2 - 4*7^(3/9))- (20*4^2 - 4*4^(3/9))
HF = 658.69 N *62.5 = 41168 N
What signal propagation phenomena causes the diffusion, or the reflection in multiple different directions, of a signal?
In the radio communication system, multipath is the propagation phenomenon that causes diffusion or reflection in multiple different directions of a signal.
Multipath is a propagation mechanism that impacts the propagation of signals in radio communication. Multipath results in the transmission of data to the receiving antenna by two or more paths. Diffusion and reflection are the causes that create multiple paths for the signal to be delivered.
Diffraction occurs when a signal bends around sharp corners; while reflection occurs when a signal impinges on a smooth object. When a signal is received through more than one path because of the diffraction or reflection, it creates phase shifting and interference of the signal.
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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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How should backing plates, struts, levers, and other metal brake parts be cleaned?
Answer: Cleaning of mechanical parts is necessary to remove contaminants, and to avoid clogging of wastes which could restrict the functioning of the machine.
Explanation:
There are different agents used for cleaning different machine instruments to prevent their corrosion and experience proper cleaning.
Backing plates must be dry cleaned using a cotton cloth to remove the dirt, dust or any other dry contaminant.
Struts can be wet cleaned by applying alcoholic solvent.
Levers can be cleaned using a mineral spirit.
Metallic plates can be cleaned using water based solution or water.
green building emphasizes using what type of design process?
The green building emphasizes using sustainable design processes.
The is that green buildings are structures that are built with environmentally sustainable design processes, that save energy, water, and other natural resources, and that provide a healthier living environment for people. Green buildings are not only environmentally friendly but also sustainable and cost-efficient.What is green building?Green building refers to the process of building a structure that reduces its impact on the environment and human health throughout its life cycle. This process integrates into the design and construction of a building's sustainability and energy-efficiency, using a holistic approach from site selection to demolition.The most efficient way to reduce a building's environmental footprint is to design it with sustainable materials and technologies that minimize the use of natural resources and energy. This design process is called green building design. A green building design process aims to minimize a building's energy consumption, optimize its use of natural light and ventilation, and reduce the amount of waste it generates. A green building design process also emphasizes the use of renewable energy sources, such as solar and wind power, to reduce a building's reliance on nonrenewable sources of energy.
The green building emphasizes using sustainable design processes. These green buildings are structures that are built with environmentally sustainable design processes, that save energy, water, and other natural resources, and that provide a healthier living environment for people.
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Harry is using a backpack to carry all of his interior design supplies. He has his sketchbook, measuring tape, level, colored pencils, and water bottle placed in the main compartment of the bag. What risk is Harry taking by carrying his supplies like this?
A.
His level or sketchbook may mark or destroy his other items
B.
His measuring tape may leak ink on his sketchbook and other items
C.
His water bottle may leak or his colored pencils may mark items
D.
Harry isn’t taking any risk
A square coil, 2 in. on a side, has 240 turns of wire and is placed between the poles of a magnet that are slightly more than 2 in apart. if the horizontally directed field has a uniform flux density of 11,180 maxwells per square inch and the coil is rotated from a vertical plane to a horizontal plane in 0.05 sec, calculate the average generated voltage.
By multiplying the peak voltage by the constant 0.637, which is equal to two divided by pi (), one can find the average voltage (VAV) of a sinusoidal waveform.
RMS and average voltage - what are they?An electromotive force source is identified by its root-mean-square (rms) voltage, or root-mean-square voltage (Vrms). Its value is the voltage squared's square root as a function of time. V0/2, or 0.707V0, is used to calculate the value of Vrms.
What does an AC voltage typically look like?Sinusoidal alternating voltage or current has a cycle-average value of zero. This is due to the fact that the area of the positive and negative half cycles are equidistant from one another.
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Prove that for an arbitrary vector a (x, y, z) and an arbitrary scalar function φ(x, y, z) that ∇⋅ (∇× a) = ∇× ( ∇ x A ) = 0, ∇× ( ∇φ ) = 0Hint: It is easiest if you use rectangular coordinates to prove these identities. (But keep in mind that if you prove them in any coordinate system, the identities must be true in all coordinate systems.
We have proven that ∇⋅ (∇× a) = ∇× ( ∇ x A ) = 0, ∇× ( ∇φ ) = 0, in rectangular coordinates.
To prove that ∇⋅ (∇× a) = ∇× ( ∇ x A ) = 0, ∇× ( ∇φ ) = 0, we will use rectangular coordinates. We can express the vector a as (x,y,z). We can express the scalar function φ as φ(x,y,z).
The first identity states that ∇⋅ (∇× a) = 0. To prove this, we use the fact that the divergence of a cross product is zero:
∇⋅ (∇× a) = ∇⋅ [∂ay/∂z - ∂az/∂y, ∂az/∂x - ∂ax/∂z, ∂ax/∂y - ∂ay/∂x]
= (∂/∂x)[∂ay/∂z - ∂az/∂y] + (∂/∂y)[∂az/∂x - ∂ax/∂z] + (∂/∂z)[∂ax/∂y - ∂ay/∂x]
= 0 + 0 + 0
= 0
The second identity states that ∇× ( ∇ x A ) = 0. To prove this, we use the fact that the curl of the gradient is zero:
∇× ( ∇ x A ) = [∂/∂y (∂A/∂z) - ∂/∂z (∂A/∂y), ∂/∂z (∂A/∂x) - ∂/∂x (∂A/∂z), ∂/∂x (∂A/∂y) - ∂/∂y (∂A/∂x)]
= 0 + 0 + 0
= 0
The third identity states that ∇× ( ∇φ ) = 0. To prove this, we use the fact that the curl of the gradient is zero:
∇× ( ∇φ ) = [∂/∂y (∂φ/∂z) - ∂/∂z (∂φ/∂y), ∂/∂z (∂φ/∂x) - ∂/∂x (∂φ/∂z), ∂/∂x (∂φ/∂y) - ∂/∂y (∂φ/∂x)]
= 0 + 0 + 0
= 0
Therefore, we have proven that ∇⋅ (∇× a) = ∇× ( ∇ x A ) = 0, ∇× ( ∇φ ) = 0, in rectangular coordinates.
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A 360 kg/min stream of steam enters a turbine at 40 bar pressure and 100 degrees of superheat. The steam exits the turbine as a 100% saturated vapor at a pressure of 5 bar. Write and simplify the appropriate energy balance and then determine the energy generated by the steam as it passes through the turbine in kW.
Estimate properties and pipe diameter Determine the diameter of a steel pipe that is to carry 2000 gal/min of gasoline with a pressure drop of 5 psi per 100 ft of horizontal pipe. Pressure drop is a function of flow rate, length, diameter, and roughness. Either iterative methods OR equation solvers are necessary to solve implicit problems. Total head is the sum of the pressure, velocity, and elevation. What is the density of gasoline
Answer:
Diameter of pipe is 0.535 ft
Explanation:
see attachment, its works out 1st half
“Snow Cover Area change Analysis for Kabul Basin”
Summarize how GIS & Remote Sensing is incorporated in this study.
GIS
The full for GIS is : Geographic Information System.
The GIS is a system of mapping that is used to create, analyze, manage and map all the types of data.
It is a method capturing, checking as well as displaying all the data that is related to the position of the surface of earth.
Remote Sensing
Remote sensing is defined as a process where the various physical characteristics of an area are constantly monitored and detected by a process of measuring the reflection of the emitted radiations at ta distance.
The snow covered areas of the Kabul basin can be monitored and analyzed by using the process of GIS and remote sensing.
They provide a continuous source of information and data about snow covered peaks, the amount of snow to the authorities.
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Datums and benchmarks are used for ______
Answer:
Measuring elevations
Explanation:
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Structural Safety Assessment and Traffic Control Strategies of Widened Highway Bridges under Maintenance Works Requiring Partial Lane Closure
Structural Safety Assessment and Traffic Control Strategies of Widened Highway Bridges under Maintenance Works Requiring Partial Lane Closure journal is based on the way and techniques that can be used in maintaining the Safety on the road as well as the Assessment of Traffic Control.
What are the techniques in controlling the traffic?
There are Devices that are typically used in the traffic control, and this can include speed bumps as well as the barricades to block streets.
Others techniques are:
turn prohibitions stop signs raised pavement markers.Traffic restraint can also entails the includes programs that can foster bicycle as well as the pedestrian travel.
The rapid structural safety assessment help in inspecting and evaluating the concrete structure as well in determining the damaged structure if it is unsafe for personnel within the building .
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AC motor characteristics require the applied voltage to be proportionally adjusted by an AC drive whenever the frequency is changed. True or false?
Where's an inductor most likely to be found in a power-supply circuit?
A commercial jet is flying at a standard altitude of 35,000 ft with a velocity of 550 mph: (a) what is the Mach number? (b) should the flow be treated as incompressible, why or why not?
Answer:
Mach number = 0.68168
The flow should be treated as compressible.
Explanation:
Given that:
The altitude of a commercial jet = 35000
The properties of air at that given altitude are as follows:
Pressure = 24.577 kPa
Temperature T = 50.78176° C
Temperature T = ( 50.78176 + 273 )K = 328.78176 K
\(\varphi = 0.38428 \ kg/m^3\)
The velocity is also given as: 550 mph = 245.872 m/s
Therefore, the sonic velocity is firstly determined by using the formula:
\(a = \sqrt{ \vartheta \times R \times T\\)
\(a = \sqrt{1.4 \times 287 \times 323.78176\)
\(a = \sqrt{130095.5112\)
a = 360.68755 m/s
Then, we can calculate the Mach number by using the expression:
\({Mach \ number = \dfrac{V}{a}}\)
\(Mach \ number = \dfrac{245.872}{360.68755}\)
Mach number = 0.68168
b) Ideally, all flows are compressible because the Mach number is greater than 0.3, suppose the Mach number is lesser than 0.3, then it is incompressible.
The leakage from the artificially constructed Tempe Town Lake in Tempe, AZ, can be as low as 0.5 m/day or as high as 3 m/day. The lake covers 230 surface acres. If the specific yield of the subsurface formation is 30 percent, estimate the average regional groundwater level rise assuming that the aerial extent of the effect of leakage is: a) 250 acres and b) 2.5 km2 .
The estimated average regional groundwater level rise is 5.365 m/day for an aerial extent of 250 acres and 2.171 m/day for an aerial extent of 2.5 km².
How to solveTo estimate the average regional groundwater level rise, we need to first calculate the volume of water leaking from Tempe Town Lake daily and then divide that by the area and specific yield.
First, we need to find the average leakage rate. The leakage rate varies from 0.5 m/day to 3 m/day.
We can calculate the average as follows:
Average leakage rate = (0.5 + 3) / 2 = 3.5 / 2 = 1.75 m/day
Next, we need to calculate the volume of water leaking daily. The lake covers 230 surface acres, which we need to convert to square meters:
1 acre = 4046.86 m²
230 acres = 230 * 4046.86 m² = 930,776.8 m²
Now, we can find the volume of water leaking daily:
Volume = Surface area * Leakage rate
Volume = 930,776.8 m² * 1.75 m/day = 1,628,859 m³/day
Now, let's find the average regional groundwater level rise for each scenario:
a) 250 acres
First, convert the area to square meters:
250 acres = 250 * 4046.86 m² = 1,011,715 m²
Groundwater level rise = Volume / (Area * Specific yield)
Groundwater level rise = 1,628,859 m³/day / (1,011,715 m² * 0.3) = 5.365 m/day
b) 2.5 km²
First, convert the area to square meters:
2.5 km² = 2.5 * 1,000,000 m² = 2,500,000 m²
Groundwater level rise = Volume / (Area * Specific yield)
Groundwater level rise = 1,628,859 m³/day / (2,500,000 m² * 0.3) = 2.171 m/day
In summary, the estimated average regional groundwater level rise is 5.365 m/day for an aerial extent of 250 acres and 2.171 m/day for an aerial extent of 2.5 km².
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Explain why the scenario below fails to illustrate an understanding of the importance of metrology. Situation: Natalie is a calibration technician at a food production plant. Natalie: "The oven is just a couple of degrees off. I will just wait a few hours to see if it will level out on its own"
Answer:
Explanation:
The situation being described completely fails in regard to the importance of metrology. This is because the main importance of metrology is making sure that all of the measurements in a process are as accurate as possible. This accuracy allows an entire process to function efficiently and without errors. In a food production plant, each individual department of the plant relies on the previous function to have completed their job with the correct and accurate instructions so that they can fulfill their functions correctly and end up with a perfect product. If the oven (like in this scenario) is a couple of degrees off it can cause the product to come out burned or undercooked, which will then get transferred to the next part of production which will also fail due to the failed input (burned or undercooked product). This will ultimately lead to an unusable product at the end of the process and money wasted. Which in a large production plant means thousands of products in a single batch are thrown away.
In terms of the necessity of metrology, the situation stated absolutely fails. This is because metrology's primary goal is to ensure that all measurements in a process are as precise as feasible. This precision allows a whole process to run smoothly and error-free. If the oven temperature is wrong by a few degrees, the product will come out charred or undercooked, and the product will be sent to the next step of the process, which will also fail owing to the failed input. This will result in a useless product and a waste of money at the end of the procedure. In a big manufacturing facility, this means thousands of goods are discarded in a single batch.
Describe and sketch the locus of a point A which moves according to the equation R^x=atcos(2πt),R^y=atsin(2πt),R^z=0
The locus of point A is a circle in the xy-plane with radius |a|/2 and center at the origin.
How to explain the locusWe can plot the parametric equation of a curve in the xy-plane using the x and y coordinates as a starting point:
x = at cos(2t) and y = at sin(2t).
This curve has a radius of |a|/2 and a center at the origin. The rotational direction is determined by the sign of a.
The z coordinate, which is always 0, is then added. This means that the locus of point A is a circle centered at the origin in the xy-plane. |a|/2 is the radius of the circle.
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Water is to be transported at a rate of 2 m3/s in uniform flow in an open channel whose surfaces are asphalt lined. The bottom slope is 0.001. Determine the dimensions of the best cross section if the shape of the channel is (a) rectangular and (b) trapezoidal.
With regard to the dimension,
a) Therefore, the best cross-section for a rectangular channel is a width of 3.172 m and a depth of 1.086 m.
What is the explanation for the above response?(a) Rectangular channel:
The hydraulic radius of a rectangular channel is half the depth of flow, and the cross-sectional area is equal to the product of the width and depth.
Let's assume the depth of flow as "y" and the width of the channel as "b". Then, the cross-sectional area of the channel is:
A = b * y
The wetted perimeter of the rectangular channel is:
P = b + 2y
The hydraulic radius is:
R = A/P = (b*y) / (b+2y)
The discharge Q is given as:
Q = VA = R * (b*y) * sqrt(S)
where S is the bottom slope, and V is the average velocity of the flow.
We are given Q = 2 m^3/s, and S = 0.001. Let's assume the velocity of flow as "v".
Substituting the values, we get:
2 = (by) * sqrt(0.001) * (by) / (b + 2y)
Solving for y, we get:
y = 1.086 m
Substituting this value in the equation for b, we get:
b = 3.172 m
Therefore, the best cross-section for a rectangular channel is a width of 3.172 m and a depth of 1.086 m.
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If a transformer is operated at rated frequency but voltage higher then the rated value, how do you expect the following quantities to change:-
A) No-load current.
B) Hysterics loss.
C) Eddy current loss.
how to find controling resistnace to heat transfer?
Answer:
Explanation:
The controlling resistance to heat transfer can be found by analyzing the different mechanisms of heat transfer involved in a given system and identifying the limiting factor that controls the overall rate of heat transfer.
There are three main mechanisms of heat transfer: conduction, convection, and radiation. Conduction occurs when heat flows through a solid material or between two materials in contact. Convection occurs when heat is transferred by the movement of fluids such as air or water. Radiation occurs when heat is transferred through electromagnetic waves.
The controlling resistance to heat transfer can be calculated using the following equations:
For conduction:
Rc = L / (k * A)
where Rc is the thermal resistance due to conduction, L is the distance over which heat is transferred, k is the thermal conductivity of the material, and A is the cross-sectional area through which heat flows.
For convection:
Rc = 1 / (h * A)
where Rc is the thermal resistance due to convection, h is the heat transfer coefficient for the fluid, and A is the surface area of the object.
For radiation:
Rc = 1 / (ε * σ * A * (T1^2 + T2^2) * (T1 + T2))
where Rc is the thermal resistance due to radiation, ε is the emissivity of the object, σ is the Stefan-Boltzmann constant, A is the surface area of the object, T1 and T2 are the temperatures of the object and the surrounding environment, respectively.
Once the thermal resistances for each mechanism of heat transfer have been calculated, the controlling resistance can be determined by identifying the highest value among them. The mechanism with the highest thermal resistance is the limiting factor that controls the overall rate of heat transfer in the system.
The heat transfer resistance control can be found with the following equation: R = L / (kA).
To find the controling resistnace to heat transfer, you must first understand what these terms mean.
Controling resistnace, also known as thermal resistance, is a measure of how difficult it is for heat to flow through a material. The higher the thermal resistance, the more difficult it is for heat to transfer.
Heat transfer, on the other hand, is the process of heat moving from one object or substance to another due to a difference in temperature. There are three main types of heat transfer: conduction, convection, and radiation.
To find the controling resistnace to heat transfer, you must consider the material's thermal conductivity, thickness, and surface area. The thermal resistance can be calculated using the equation R = L / (kA), where R is the thermal resistance, L is the thickness of the material, k is the thermal conductivity, and A is the surface area.
By understanding the factors that contribute to controling resistnace and using the equation above, you can find the controling resistnace to heat transfer for a given material.
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A large gas-turbine power plant delivers a net power output of 325 MW to an electric generator. The minimum temperature in the cycle is 300 K, and the maximum temperature is 1500 K. The minimum pressure in the cycle is 100 kPa, and the compressor pressure ratio is 12. Calculate the power output of the turbine, the back work ratio, and the thermal efficiency of the cycle. Also, determine the improved thermal efficiency if a regenerator, with an effectiveness of 85 percent, were installed in the power plant.
Answer:
A) Power output = 541.67 MW
B) Backwork ratio = 0.4
C) Improved thermal efficiency = 0.598
Explanation:
We are given;
Net power output; W'_net = 325 MW
Minimum Temperature; T1 = 300 K
Maximum Temperature; T4 = 1500 K
Compression Pressure ratio;P2/P1 = 12
From online tables, we have the following properties of air;
Specific heat capacity; C_p = 1.004 KJ/Kg
Adiabatic constant; k = 1.4
Temperature at stage 2 will be given by the formula;
T2 = T1(P2/P1)^((k - 1)/k)
Plugging in the relevant values gives;
T2 = 300(12)^((1.4 - 1)/1.4)
T2 = 610.18 K
Similarly, Temperature at stage 3 will be;
T3 = T4(P2/P1)^((k - 1)/k)
Plugging in the relevant values gives;
T3 = 750(12)^((1.4 - 1)/1.4)
T3 = 1525.45 K
Now, let's calculate the specific heat addition given by the formula;
q = C_p(T3 - T2)
q = 1.004(1525.45 - 610.18)
q = 918.93 KJ/Kg
Let's now calculate the specific net work output;
w_net = C_p[(T3 - T4) - (T2 - T1)]
w_net = 1.004[(1525.45 - 750) - (610.18 - 300)]
w_net = 467.13 KJ/Kg
A) Power output is given by;
W_T = (W'_net/W_net) × C_p(T3 - T4)
W_T = (325/467.13) × 1.004(1525.45 - 750)
W_T = 541.67 MW
B) back work ratio is;
f = (T2 - T1)/(T3 - T4)
f = (610.18 - 300)/(1525.45 - 750)
f = 0.4
C) Thermal efficiency is given by;
η = w_net/q
Since we are told that a regenerator, with an effectiveness of 85 percent, were installed in the power plant.
Thus;
η = (w_net/q)÷0.85
η = (467.13/918.94) ÷ 0.85
η = 0.598
An instrument weighing Sibs is mounted on the housing of a pump that rotates at 30 rpm. The amplitude of motion of the housing is 0.003 ft. We want no more than 10% of the housing's motion to be transmitted to the instrument.
a. Design a suitable isolator having negligible damping. b. Compute the force transmitted to the instrument.
To design a suitable isolator with negligible damping, we can use a spring-mass system. The isolator will consist of a spring that connects the housing of the pump to the instrument. The spring should be selected to have a natural frequency significantly lower than the rotational frequency of the pump (30 rpm). This ensures that the isolator does not resonate with the pump's motion.
To compute the force transmitted to the instrument, we can use the equation for the force transmitted through a spring-mass system:
F = k * xwhere F is the force transmitted, k is the spring constant, and x is the displacement of the housing. Given that the amplitude of motion of the housing is 0.003 ft and we want no more than 10% of the housing's motion to be transmitted, we can set the force transmitted to be 10% of the maximum force:F_transmitted = 0.1 * k * 0.003 ftThe specific value of the force transmitted will depend on the chosen spring constant (k) and can be determined based on the desired level of isolation.
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A company sent prototypes of a newly designed hair dryer for trial use to 100 homes along with a satisfaction survey. A month later the company received 82 completed surveys. This process is part of which step of the engineering design process?
Answer:
The answer is "evaluating outcomes ".
Explanation:
The assessment of the results shows that maybe a program has achieved its goals. The assessment with results measures the results of the program and decides whether intended results were achieved. Its results allow you to achieve people by the measurable changes made through participating in your project by students enrolled. It is a form of assessment that examines if changes occur for students enrolled or if these adjustments are related to a program.
1. a major reason for the projected shortage of trained craft professionals is
a. construction salaries are too low
b. technology has eliminated many construction careers
c. demand for construction projects is declining
d. the retirement of baby boomers
A major reason for the projected shortage of trained craft professionals is that: b. technology has eliminated many construction careers.
What is computing?Autonomic computing can be defined as a process which involves the use of both computer hardware and software to manage, analyze, and process, so as to complete a goal-oriented task.
Also, autonomic computing systems are self-managing and it is similar in operations with the autonomic nervous system in humans, and as such it can be used in construction projects and assembly lines for optimum automated production.
In conclusion, automation technology through robots, smart machines and computers has reduced the need for people in many jobs, including trained craft professionals.
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