3/4 + 1/2
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The concentration ratio for the PTC is approximately 1.48, and the length of the parabolic surface is approximately 5.2 meters.

To determine the concentration ratio and length of the parabolic surface for a Parabolic Trough Collector (PTC) with the given parameters, we can use the following formulas:

Concentration Ratio (CR) = Rim Angle / Aperture Angle

Length of Parabolic Surface (L) = Aperture^{2} / (16 * Focal Length)

First, let's calculate the concentration ratio:

Given:

Rim Angle (θ) = 80º

Aperture Angle (α) = 5.2 m

Concentration Ratio (CR) = 80º / 5.2 m

Converting the rim angle from degrees to radians:

θ_rad = 80º * (π / 180º)

CR = θ_rad / α

Next, let's calculate the length of the parabolic surface:

Given:

Aperture (A) = 5.2 m

Receiver Diameter (D) = 50 mm = 0.05 m

Focal Length (F) = A^{2} / (16 * D)

L = A^{2} / (16 * F)

Now we can substitute the given values into the formulas:

CR =\((80º * (π / 180º)) / 5.2 m\)

L = \((5.2 m)^2 / (16 * (5.2 m)^2 / (16 * 0.05 m))\)

Simplifying the equations:

CR ≈ 1.48

L ≈ 5.2 m

Therefore, the concentration ratio for the PTC is approximately 1.48, and the length of the parabolic surface is approximately 5.2 meters.

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The process of giving different colors to each vertex of a graph G so that no two neighboring vertices receive the same color is known as graph coloring.

When coloring a graph, the goal is to use as few colors as possible. The chromatic number of a graph G is the lowest set of colors needed to color that graph. A NP Complete problem is the graph coloring issue.

A unique characteristic of a graph coloring is that two neighboring vertices, or those with an edge connecting them, cannot have the same color.

The difficulty stems from the fact that two countries (or states) must have distinct colors when they are close to one another when coloring a map. The United States is depicted on the following four-color map.

Therefore, The process of giving different colors to each vertex of a graph G so that no two neighboring vertices receive the same color is known as graph coloring.

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Answer:

0.00695 A

Explanation:

µ represents \(10^{-6}\). Multiply this by 6,950.

The conditions of J=1, K=0, PRESET and CLEAR being active, and a 100-Hz clock pulse applied to the CLK, the output Q of the JK flip-flop will be 1. The correct option is (b) 1.

In an JK flip-flop, when J=1 and K=0, the output Q changes to a logic high or 1 on the rising edge of the clock pulse. Since both PRESET and CLEAR are active (logic 0 for IC 7476), the flip-flop will be in its normal mode of operation, and the 100-Hz clock pulse applied to CLK will cause Q to become 1 on every rising edge of the clock pulse.

Given the conditions of J=1, K=0, PRESET and CLEAR being active, and a 100-Hz clock pulse applied to the CLK, the output Q of the JK flip-flop will be 1. The correct option is (b) 1.

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To calculate the magnitude of the voltage drop Vab, we first need to find the current flowing through the circuit when switch S1 is closed and switch S2 is open. This can be done using Ohm's Law (V = IR), where V is voltage, I is current, and R is resistance.

1. Identify the total resistance in the circuit. Since switch S2 is open, the current will only flow through the resistors connected to switch S1.
2. Apply Ohm's Law to calculate the current flowing through the circuit: I = V/R, where V is the voltage source, and R is the total resistance.
3. Calculate the voltage drop across each resistor using Ohm's Law (V = IR).
4. Determine Vab, which is the voltage drop between points A and B.

To find the magnitude of the voltage drop Vab when switch S1 is closed and switch S2 is open, you need to follow these steps: identify the total resistance in the circuit, calculate the current using Ohm's Law, find the voltage drop across each resistor, and finally determine the voltage drop between points A and B (Vab).

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When calculating the magnitude of the voltage drop (Vab) across a circuit with switch S1 closed and switch S2 open, you need to consider the circuit configuration, the resistances, and the voltage source.

To accurately answer this question, I would need specific information about the circuit components such as resistor values and the voltage source value. However, I can explain the process:
1. With switch S1 closed and switch S2 open, identify the active portion of the circuit.
2. Determine the total resistance (Rt) of the active circuit.
3. Apply Ohm's Law (V = I * R) to find the current (I) flowing through the circuit. (If the voltage source is given)
4. Calculate the voltage drop (Vab) across the desired portion of the circuit using the current and the resistance of that portion.

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Answer:

Q = [ mCp ( ΔT) ] \(_{cooling water }\)

(ΔT)\(_{cooling water}\) and  Q  is given

\(m_{cooling water}\)  = \(\frac{Q}{Cp[ T_{out} - T_{in} ] }\)

next the rate of condensation of the steam

Q = [ m\(h_{fg}\) ]\(_{steam}\)

  \(m_{steam} = \frac{Q}{h_{fg} }\)

Total resistance of the condenser is

R = \(\frac{Q}{change in T_{cooling water } }\)

Explanation:

How will the rate of condensation of the steam and the mass flow rate of the cooling water can be determined

Q = [ mCp ( ΔT) ] \(_{cooling water }\)

(ΔT)\(_{cooling water}\) and  Q  is given

\(m_{cooling water}\)  = \(\frac{Q}{Cp[ T_{out} - T_{in} ] }\)

next the rate of condensation of the steam

Q = [ m\(h_{fg}\) ]\(_{steam}\)

  \(m_{steam} = \frac{Q}{h_{fg} }\)

Total resistance of the condenser is

R = \(\frac{Q}{change in T_{cooling water } }\)

Answer:

1. 1111.5MPa

2. 56.1GPa

Explanation:

1. Longitudinal tensile stress can be obtained by obtaining the strength and volume of the fiber reinforcement. The derived formula is given by;

σcl = σm (1 - Vf) + σfVf

Substituting the figures, we will have;

45(1 - 0.30) + 3600(0.30)

45(0.70) + 1080

31.5 + 1080

= 1111.5MPa

2. Longitudinal modulus of elasticity or Young's modulus is the ability of an object to resist deformation. The derived formula is given by;

Ecl = EmVm + EfVf

Substituting the formula gives;

= 2.4 (1 - 0.30) + 131 (0.30)

= 2.4(0.70) + 39.3

= 16.8 + 39.3

= 56.1GPa

Using the appropriate relation, the longitudinal tensile stress and the longitudinal modulus are 1111.50 and 56.10 respectively.

Longitudinal tensile stress can be obtained using the relation :

Substituting the values into the relation:

45(1 - 0.30) + 3600(0.30)

45 × 0.70 + 1080

31.5 + 1080

= 1111.50 MPa

2.)

Longitudinal modulus of elasticity is obtained using the relation :

Substituting the values thus :

2.4 (1 - 0.30) + 131 (0.30)

= 2.4 × 0.70 + 39.3

= 16.8 + 39.3

= 56.10 GPa

Hence, the longitudinal tensile stress and the longitudinal modulus are 1111.50 and 56.10 respectively.

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Answer:By obey peoples propertice

Explanation:

Answer:

Compute the first four central moments for the following data:

i xi

1 45

2 22

3 53

4 84Explanation:

farmers adapted to the environment on the huge plains is the right response (option C). built sod homes, employed dry agricultural methods, erected barbed wire fences, and utilized cow.

Windmills sold water, and steel was used to make difficult oil. How Farmers Adapted to Conditions on the Great Plains might be the ideal heading for this paragraph. We are discussing how farmers changed their way of life as the West was opened up. West of the Mississippi River is where you'll find the Great Plains. It is a vast, flat, dusty, environment area that significantly impacted the farmers who lived there, forcing them to innovate and build a variety of items in order to survive or live in better conditions, notably with reference to farming methods.

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The complete question is-

Built sod houses , used dry farming techniques , used barbed wire fences , burned cow and buffalo chips for fuel , windmills pimped water , steel pow used for tough oil . What would be the best title for these ? A. Methods used by forty niners to stake claims. b. Sources of conflict between ranchers and farmers. C. How farmers adapted to conditions on the great plains. D. How american indians and western farmers cooperated

Answer:

good shoes

Explanation:

yes

Answer: Neutrals

Explanation: System grounding on a power system is a term used to describe the entire processes involved when a neutral is used as the conductor to connect to the solid earth. This ensures that power is generated. This is usually done using either an inductor, an impendance or a resistor. It is very important and necessary to carry out a proper grounding of a power system in order to ensure the safety of the equipment and the personnel etc

The reinforcement must be stored in such a manner as to prevent: deterioration and corrosion.

Concrete reinforcement is accomplished by inserting deformed steel bars or welded wire fabric inside newly cast concrete. The goal of reinforcing is to give strength to concrete where it is required.

All exposed reinforcing surfaces should be carefully cleaned of loose mortar, corrosion, and other pollutants. To prevent overbuilding and limit bond development loss at rebar deformations, the high-performance protective coating should be placed at a thickness of 305 microns.

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Full Question:

What are the words that complete the sentence below:

The reinforcement must be stored in such a manner as to prevent:

Note that the toughness of the material is 0.0226 kJ.

Toughness = (Area of triangle * Cross-sectional area) / 1,000

= (0.5 * 380 kN * 200 GPa * 0.004 m2) / 1,000

= 0.0226 kJ

Toughness is important in physics as it measures a material's ability to absorb energy and withstand deformation or fracture.

It helps determine the material's resistance to cracking and breaking under stress, making it crucial in applications where durability and reliability are required.

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The PW method allows the analysis of the respective alternative lives. The statement is true.The PW (Present Worth) technique is a procedure that assesses the cost-effectiveness of a project or investment in the current year.

PW measures the present worth of cash inflows and outflows and is used to analyze cash flow series.The PW method allows analysis over the respective alternative lives. This is because of the time value of money. The PW technique is typically utilized for long-term projects because it calculates a net present worth that enables evaluations between investments with different timescales. Thus, the statement is true.A conventional cash flow series is characterized by one or more negative net cash flows and then a string of positive net cash flows that are entirely returned to the company or investor. The term "conventional" refers to the fact that cash flow is negative in the beginning and positive in the end. Multiple "i" values may exist when there are more than one sign change in net cash flow (CF) series. This is true.Selection of an independent project using the ROR (Rate of Return) method imposes certain constraints. Out of the given options, the correct answer is option A: select all alternatives with ROR greater than or equal to MARR (Minimum Acceptable Rate of Return).Why choose alternatives with ROR greater than or equal to MARR?ROR is an approach that calculates the internal rate of return of a project, which is the interest rate at which the project's net present value (NPV) is zero. MARR, on the other hand, is the required rate of return that the company or investor requires from a particular investment. If the ROR is greater than or equal to MARR, the project is profitable. Therefore, to choose a profitable independent project using the ROR method, all alternatives with ROR greater than or equal to MARR should be selected.

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Answer:

thanks for the poiunts

Explanation:

Answer:

Total contraction on the bar = 1.238 mm

Explanation:

Modulus of Elasticity, E = 85 GN/m²

Diameter of the aluminium bar, \(d_{Al} = 40 mm = 0.04 m\)

Load, P = 160 kN

Cross sectional area of the aluminium bar without hole:

\(A_1 = \frac{\pi d_{Al}^2 }{4} \\A_1 = \frac{\pi 0.04^2 }{4}\\A_1 = 0.00126 m^2\)

Diameter of hole, \(d_h = 30 mm = 0.03 m\)

Cross sectional area of the aluminium bar with hole:

\(A_2 = \frac{\pi( d_{Al}^2 - d_{h}^2)}{4} \\A_2 = \frac{\pi (0.04^2 - 0.03^2) }{4}\\A_2 = 0.00055 m^2\)

Length of the aluminium bar, \(L_{Al} = 600 mm = 0.6 m\)

Length of the hole, \(L_h = 100mm = 0.1 m\)

Contraction in aluminium bar without hole  \(= \frac{P * L_{Al}}{A_1 E}\)

Contraction in aluminium bar without hole  \(= \frac{160*10^3 * 0.6}{0.00126 * 85 * 10^9 }\)

Contraction in aluminium bar without hole = 96000/107100000

Contraction in aluminium bar without hole = 0.000896

Contraction in aluminium bar with hole  \(= \frac{P * L_{h}}{A_2 E}\)

Contraction in aluminium bar without hole  \(= \frac{160*10^3 * 0.1}{0.00055 * 85 * 10^9 }\)

Contraction in aluminium bar without hole = 16000/46750000

Contraction in aluminium bar without hole = 0.000342

Total contraction = 0.000896 + 0.000342

Total contraction = 0.001238 m = 1.238 mm

If the value to which s refers is in the set the_set, the following expression will evaluate to True:

s in the_set

This expression uses the in keyword to check if the value of s is contained in the set the_set. If the value of s is in the set, the expression will evaluate to True, and if the value is not in the set, the expression will evaluate to False.

The resultant horizontal anchoring force required to hold the nozzle in place is 65.42 lb, acting at an angle of 20.57 degrees from the vertical.

To solve the problem of determining the resultant horizontal anchoring force required to hold the nozzle in place, we need to apply the principles of fluid mechanics and vector addition. We can calculate the force exerted by the water on the nozzle using the mass flow rate equation, assuming that the water covers a semi-circular area. Next, we need to add the weight of the nozzle to the force of water, which is assumed to act vertically downwards. The resultant force can be found by vector addition, and its magnitude can be calculated using trigonometry. Finally, we can determine the direction of the resultant force with respect to the vertical using trigonometry.

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Dilution is the process of decreasing the concentration of a solute in a solution, usually simply by mixing with more solvent like adding more water to the solution.

In order to lower the concentration of the solute in a solution, dilution is the act of adding a solvent. In order to increase the concentration of the solute in the solution, concentration is the process of eliminating solvent from a solution.

In both dilution and concentration, the solute's quantity stays constant. As a result, we are able to determine the new solution volume needed to achieve the target solute concentration. referring to the concept of molarity.

Molarity is equal to the moles of solute per litre of solution.

Molarity = moles of solute (liters of solution)

MV = moles of solute

This number is constant both before and after a concentration change, hence the product MV must remain constant throughout the process. Those are the beginning and ultimate circumstances, respectively.

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Answer:

Explanation:

In satellite communications, downlink is the establishment of a communications link from an orbiting satellite down to one or more ground stations on Earth. Contrast with uplink.

Answer:

A misfire code is a type A DTC.

Explanation:

A misfire code is a type A DTC.

A Misfire generate unburned hydrocarbons thereby increasing the load on the catalytic converter. Misfires are due to incomplete combustion or lack of combustion.

Diagnostic Trouble Code (DTC) is a type of code used by the vehicle’s onboard diagnostics (OBD) system to alert when the vehicle has a problem. Type A DTC is the most serious DTC, this are emissions related.  It requests illumination of the MIL after one failed driving cycle and stores a freeze frame DTC after one failed driving cycle.

For the square packed RVE model, the maximum fiber volume fraction is 0.41. For the hexagonal packed RVE model, the maximum fiber volume fraction is 0.52.

Fiber is an discipline that deals with the design, construction, and operation of systems that use optical fibers as the principal transmission medium. Optical fibers are thin strands of glass that carry electromagnetic waves over long distances, allowing for high-speed data transmission. Fiber engineering is used to create optical networks that enable communication, entertainment, and other services. It is also used for the transmission of data over long distances, such as for telecommunication systems, and for the distribution of electricity over power grids. Fiber engineering involves a variety of techniques, such as fiber splicing, which is the joining of two or more optical fibers; fiber optic testing, which is the testing of the quality of optical fibers; and fiber optic sensing, which is the detection and measurement of various parameters such as temperature, pressure, and strain.

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Given values: Diameter of segment AC, d₁ = 0.5 in Diameter of segment CB, d₂ = 1 inLength of segment CB, L = 10 inUniform distributed torque along segment CB, t = 60 lb.in^(-1) Shear modulus of elasticity, G = 11 × 10³ ksi The formula for maximum shear stress τ is given as,τ = (t × r) / J …(1)

Here,r is the radius of the shaftJ is the polar moment of inertiaThe polar moment of inertia J is given as,J = (π / 2) × (d²₁ + d²₂) …(2 )

Now, substituting the given values in Equation (2), we haveJ = (π / 2) × (0.5² + 1²)J = 0.9817 in⁴

Therefore, substituting the values of t, r, and J in Equation (1), we have,τ = (60 × 0.5) / 0.9817τ = 30.55 psiThus, the absolute maximum shear stress in the shaft is 30.6 psi (approx) and the unit is psi. Therefore, option (c) is correct.

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Based on  the data given, the regression equation y on-x is y = 3/4x + 1.

y = (3/4)x + 100

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Answer:

Primary cell with a nominal open circuit voltage of 1.5 Volts produced in very high volumes. Chemistry based on a zinc anode and a cathode/depolariser of manganese dioxide which absorbs the liberated hydrogen bubbles which would otherwise insulate the electrode from the electrolyte.

Answer:

Explanation:

(1) The electrolyte is a paste of ammonium chloride.

(2) The positive terminal (anode) is a carbon rod surrounded bymangAnese Dioxide as a depolarised .

(3) The negative terminal is zinc container.

The most negative value can take before the amplifier saturates. Suppose, Consider a non-ideal op amp where the output can saturate. Hence, The most negative value of is 0.5 mV

The most negative value v2 can take before the amplifier saturates.Suppose, Consider a non-ideal op amp where the output can saturate.The open voltage gain is2*10 4 where,According to figure,

The negative output value is

v0 = -10V

We need to calculate the most negative value of  

Using given formula

v0 = -A(Vs)

Where, = output value

A = voltage gain

Put the value into the formula

-10 = -2 *10 4* Vs

vs = 10/2*10  4

Vs = 0.0005v

Vs = 0.5MV

Hence, The most negative value of  is 0.5 mV.

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The most negative value can take before the amplifier saturates. Suppose, Consider a non-ideal op amp where the output can saturate. Hence, The most negative value of is 0.5 mV

The most negative value v2 can take before the amplifier saturates. Suppose, Consider a non-ideal op amp where the output can saturate. open voltage gain is2*10 4 where, According to figure,

The negative output value is

v0 = -10V

We need to calculate the most negative value of  

Using given formula

v0 = -A(Vs)

Where, = output value

A = voltage gain

Put the value into the formula

-10 = -2 *10 4* Vs

vs = 10/2*10  4

Vs = 0.0005v

Vs = 0.5MV

Hence, The most negative value of  is 0.5 mV.

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The prompt is asking for various SQL queries to retrieve specific information from a database.

To list the information of each sale item where 2 or more items were sold but only for sizes 5, 6, and 7, and to show all sale item information, the SQL query would be:

SELECT *

FROM Saleltem

WHERE (ProductID, ItemSize) IN (

SELECT ProductID, ItemSize

FROM Saleltem

WHERE ItemSize IN (5, 6, 7)

GROUP BY ProductID, ItemSize

HAVING COUNT(*) >= 2

)

The prompt is asking for various SQL queries to retrieve specific information from a database. The database includes tables such as Customer, Product, Manufacturer, InventoryItem, SaleItem, PurchaseItem, and Employee. The queries should only display the columns requested and should not produce duplicate records.

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