Answer TWO of the following topics:
i. Explain the principles of designing injection-moulded polymer products to minimise sink marks.
ii. Referring to the features of a graph of strain versus time, outline the general creep characteristics of a metal and briefly explain why the secondary creep region is the most important consideration when designing with the presence of creep effects.

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The minimum required wire diameter, assuming a factor of safety of 2.0 and a yield strength of 860 MPa (125,000 psi) for the steel, is approximately 0.248 inches.

To determine the minimum required wire diameter, we can use the formula for stress:

Stress (σ) = Force (F) / Area (A)The yield strength of the steel is given as 860 MPa (125,000 psi), and we have a factor of safety of 2.0. Therefore, the maximum stress the wire can withstand is 860 MPa / 2.0 = 430 MPa (62,500 psi).

Let's calculate the minimum required wire diameter:

Step 1: Convert the load from Newtons to Pounds-force

Load = 13,300 N = 13,300 N * (1 lb f / 4.448 N) = 2,989.28 lb f

Step 2: Calculate the area of the wire

Stress = Force / Area

Area = Force / Stress = 2,989.28 lb f / 62,500 psi

Step 3: Convert the stress and yield strength to consistent units

Area = 2,989.28 lb f / (62,500 psi * (1 lb f / in^2)) = 0.04783 in^2

Step 4: Calculate the diameter of the wire

Area = π * (diameter / 2)^2

0.04783 in^2 = π * (diameter / 2)^2

Solving for the diameter:

(diameter / 2)^2 = 0.04783 in^2 / π

(diameter / 2)^2 = 0.01521 in^2

diameter / 2 = sqrt(0.01521 in^2)

diameter = 2 * sqrt(0.01521 in^2)

diameter ≈ 0.248 in

Therefore, the minimum required wire diameter, assuming a factor of safety of 2.0 and a yield strength of 860 MPa (125,000 psi) for the steel, is approximately 0.248 inches.

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At 1.2mpa pressure and 50c

What is pressure?
By pressing a knife against some fruit, one can see a straightforward illustration of pressure. The surface won't be cut if you press the flat part of the knife against the fruit. The force is dispersed over a wide area (low pressure).

a)Mass flow rate of the refrigerant
Therefore h1= condenser inlet enthalpy =278.28KJ/Kg
saturation temperature at 1.2mpa is 46.29C
Therefore the temperature of the condenser

T2 = 46.29C - 5
T2 = 41.29C

Now,
d)power consumed by compressor W = 3.3KW
Q4 = QL + w = Q4
QL = mR(h1-h2)-W
= 0.0498 x (278.26 - 110.19)-3.3
=5.074KW
Hence refrigerator load is 5.74Kg

(COP)r = 238/53
(Cop) = 4.490

Therefore the above values are the (a) mass flow rate of the refrigerant, b) the refrigerant load, c) the cop, and d) the minimum power input to the compressor for the same refrigeration load.

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Answer:

the world will not be the same it will change dramticily and

things will not be the same

Explanation:

The types of materials are best for preventing heat transfer through convection include the following:

In Science, there are three (3) main types of heat energy transmission and these include the following:

Convection can be defined as a heat energy transfer process which typically involves the transfer of heat, as a result of the movement of mass.

Based on scientific research and experiments, convection is generally considered to be a more effective and efficient means of heat transport on planet Earth when compared to conduction.

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Answer:

- Ultrasound scanning system

- Magnetic Resonance Imaging (MRI)

- Computed tomography (CT)

- X - Ray scan

Explanation:

\(.\)

Answer:

- USS Ultarsound

- Medical sonography

The angular velocity is ω = VA/L and the qngular acceleration is α = -g/L

The velocity of end A can be expressed as:

VA = Lω

where L is the length of the bar and ω is the angular velocity.

The acceleration of end A can be expressed as:

aA = Lα

where L is the length of the bar and α is the angular acceleration.

We can see from the diagram that the acceleration of end A is equal to the acceleration due to gravity, minus the centripetal acceleration.

aA = g - Lω²

Substituting VA = Lω into the equation for aA, we get:

g - Lω² = Lα

Solving for ω, we get:

ω = VA/L

Substituting ω = VA/L into the equation for aA, we get:

α = -g/L

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The average current induced in the loop during expansion from 0.50 m to 1.00 m over 1.0 s in a magnetic field of 52 mT is 4.2 μA in the counterclockwise direction.

The average current produced within the loop and the direction of the current can be determined as follows:

Initial radius of the circular loop, r₁ = 0.50 m

Final radius of the circular loop, r₂ = 1.00 m

Magnetic field, B = 52 m T

Time taken for the transformation, t = 1.0 s

Internal resistance of the wire, R = 30 Ω

Formula:The induced emf can be given by the following formula:

ε = ΔΦ/Δt

where,

ε is the induced emf and

ΔΦ is the change in flux.

As the magnetic field is pointing into the page, the magnetic flux can be given as:

Φ = BA

where,

A is the area of the loop.

As the loop expands, the area of the loop increases.

The area can be calculated using the formula of the area of the circle.

A = πr²

The change in the area can be calculated as:

ΔA = π(r₂² - r₁²)

The change in magnetic flux can be given as:

ΔΦ = BΔA = Bπ(r₂² - r₁²)

Now, the induced emf can be given as:ε = ΔΦ/Δt = Bπ(r₂² - r₁²)/t = 52 × 10⁻³ × π(1.00² - 0.50²)/1.0 = 0.15 V

ε= 0.15 V

The induced emf can be given as the following formula:

ε = IR + Ir

where, I is the current and

R is the internal resistance of the wire.

Now, the current can be given as:

I = (ε - Ir)/RI = (0.15 - 0.5 × 10⁻⁶ × π(1.00² - 0.50²))/30 = 4.2 μA

I = 4.2 μA

Thus, the average current produced within the loop is 4.2 μA in the counterclockwise direction.

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Answer:

True because some ducks can't swim but have to learn it

Answer:

  infinite

Explanation:

The impedance of an ideal parallel resonant circuit is infinite at the resonant frequency. The sum of the admittances of the branches of the circuit is zero.

The characteristic equation of a system is a polynomial in the variable s that is equal to zero when the system is at rest.

The roots of the characteristic equation are the poles of the system's transfer function. The poles of a system determine the stability of the system.

A system is stable if all of its poles lie in the left half-plane of the complex plane. A system is unstable if any of its poles lie in the right half-plane of the complex plane.

The characteristic equation of the system in the question can be factored as follows:

(s + 1)(s + 2)(s + 4)(s - 1)(s - 2)(s - 4) = 0

The roots of this equation are s = -1, s = -2, s = -4, s = 1, s = 2, and s = 4. All of these roots lie in the left half-plane of the complex plane, so the system is stable.

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Possible candidate keys for this automobile dealership include the stock number and the vehicle identification number (VIN), as they are unique identifiers for each vehicle in the dealership's inventory.

The likely primary key would be the stock number or VIN, as they are both unique and can be used to easily search and retrieve information about a specific vehicle.A probable foreign key could be the invoice number, as it may be used to link vehicle information with the dealership's accounting system. For example, a sales transaction for a specific vehicle may reference the invoice number, which can be used to retrieve the invoice cost and other financial information.Potential secondary keys could include the make, model, year, and color of the vehicle. These fields can be used to search and filter the inventory based on specific criteria, such as finding all vehicles of a certain make or year.

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In HTML, the attribute used to specify that an input field must be filled out is "required" (option A). This attribute ensures that the user must provide a value for the input field before submitting the form, promoting proper form completion and data validation.

If the required attribute is not satisfied, the form will not be submitted, and the user will receive a prompt to fill in the necessary information. The attribute used to specify that an input field must be filled out in HTML is the "required" attribute. This attribute is used in conjunction with the "input" tag to indicate that the user must fill out the specified field before submitting the form. When the user tries to submit the form without filling out the required field, an error message will appear prompting them to fill out the required field. The "validate" and "mandatory" attributes are not used in HTML to achieve this functionality. While the term "input_required" could potentially be used as a custom attribute, it is not a standard attribute in HTML. Therefore, the correct answer is A) required.

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When a light wave enters a medium of greater optical density, there will be a decrease in the wave's **A) speed, only**.

The frequency of a light wave remains constant when it transitions between different media, so option B) frequency, only is not correct.

However, the wavelength of a light wave can change when it enters a medium with a different optical density, but it does not necessarily decrease. It can increase or decrease depending on the specific conditions. Therefore, option D) frequency and wavelength is not accurate.

The speed of light in a medium depends on the refractive index of that medium. When light enters a medium with a higher refractive index, its speed decreases. This is due to the interaction of light with the atoms or molecules of the medium, causing it to slow down. Thus, option A) speed, only is the correct answer.

While the wavelength of the light wave can be affected by the change in speed, it is not necessarily decreased. The relationship between speed and wavelength is inversely proportional, meaning that as the speed decreases, the wavelength can either increase or decrease depending on the specific conditions. Therefore, option C) speed and wavelength is not accurate.

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Answer:

0.0659 A

Explanation:

Given that :

\(I_{0} = 6nA\) ( saturation current )

at 25°c = 300 k ( room temperature )

n = 2  for silicon diode

Determine the saturation current at 100 degrees = 373 k

Diode equation at room temperature = I = Io \(\frac{V}{e^{0.025*n} }\)

next we have to determine the value of V at 373 k

q / kT = (1.6 * 10^-19) / (1.38 * 10^-23 * 373) = 31.08 V^-1

Given that I is constant

Io = \(\frac{e^{0.025*2} }{31.08}\) =  0.0659 A

The saturation current at 100 degrees Celsius will be "0.0659 A".

According to the question,

Saturation current, \(I_0\) = 6nA

At 25°C,

Room temperature = 300 k

Silicon diode, n = 2

The value of V will be:

= \(\frac{q}{kT}\)

By substituting the values,

= \(\frac{1.6\times 10^{-19}}{1.38\times 10^{-23}\times 373}\)

= 31.08 V⁻¹

hence,

By using Diode equation,

→ I = I₀ \(\frac{V}{e^{0.025\times n}}\)

or,

The current will be:

I₀ = \(\frac{V}{e^{0.025\times n}}\)

  = \(\frac{e^{0.025\times 2}}{31.08}\)

  = 0.0659 A

Thus the answer above is right.

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The angle of attack of a wing directly controls the C) distribution of pressures acting on the wing.

When the angle of attack of a wing is increased, the air moving over the curved upper surface of the wing must travel a greater distance and faster than the air moving beneath the wing's flat lower surface. This creates an area of lower air pressure above the wing and an area of higher air pressure beneath the wing, resulting in lift. The greater the angle of attack, the greater the lift produced.

However, if the angle of attack is too great, the airflow over the wing may separate, causing a loss of lift and potentially leading to a stall. Therefore, proper control of the angle of attack is crucial for safe and efficient flight.

Option C is answer.

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The correct answer is To calculate the discrete settling velocity of a grit particle, we can use the following formula:

\(V_s = (2/9) * (ρ_p - ρ_f) * g * r^2 / η\)

V_s = discrete settling velocity

ρ_p = density of particle

ρ_f = density of fluid

g = acceleration due to gravity

r = radius of particle

η = dynamic viscosity of fluid Given that the radius of the grit particle is 0.05mm and its specific gravity is 2.65, we can calculate its density as:

ρ_p = specific gravity * ρ_water

\(= 2.65 * 1000 kg/m^3= 2650 kg/m^3\)

At a water temperature of 20°C, the dynamic viscosity of water is\(1.004 × 10^-6 m^2/s,\)which we are given.

The density of water at 20°C is approximately \(1000 kg/m^3,\) and the acceleration due to gravity is\(9.81 m/s^2.\)

Substituting these values into the formula, we get:

\(V_s = (2/9) * (2650 - 1000) * 9.81 * (0.05 × 10^-3)^2 / (1.004 × 10^-6)= 0.086 m/s\)(rounded to three decimal places)

Therefore, the discrete settling velocity of the grit particle is approximately 0.086 m/s.

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A real operational amplifier (op amp) generally has five terminals, which are labeled as the inverting input (−), non-inverting input (+), output (OUT), positive power supply (V+), and negative power supply (V−). Each of these terminals has a specific function that determines the behavior of the op amp.

The inverting input terminal (−) is the input that is connected to the inverting amplifier circuit, where the input signal is amplified with a negative gain. This terminal is responsible for inverting the input signal and feeding it into the op amp. The non-inverting input terminal (+) is the input that is connected to the non-inverting amplifier circuit, where the input signal is amplified with a positive gain. This terminal is responsible for amplifying the input signal and feeding it into the op amp. The output terminal (OUT) is the output of the op amp, which is the amplified signal that is produced by the op amp's internal circuitry. This terminal is responsible for delivering the amplified signal to the load or other circuit components.

The positive power supply terminal (V+) is the input that is connected to the positive power supply, which provides the op amp with a positive voltage to operate. This terminal is responsible for supplying the op amp with the required voltage to operate. The negative power supply terminal (V−) is the input that is connected to the negative power supply, which provides the op amp with a negative voltage to operate. This terminal is responsible for supplying the op amp with the required voltage to operate. In summary, the inverting input (−) and non-inverting input (+) terminals are responsible for receiving and amplifying the input signal, while the output (OUT) terminal delivers the amplified signal to the load or other circuit components. The positive power supply (V+) and negative power supply (V−) terminals provide the op amp with the required voltage to operate.

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Correct response is Driving may cause your air pressure to go too low, requiring an immediate halt.

Your air pressure could drop too low while you're driving, necessitating an emergency stop, if it doesn't return to normal in the allotted amount of time.

The weight of air molecules pressing down on the Earth is known as air pressure. As you ascend from the surface of the ocean into the atmosphere, the pressure of the air molecules changes. At sea level, where the density of the air molecules is maximum, there is the highest pressure.

1. Air pressure is measured by barometers.

When predicting the weather and analyzing weather patterns, meteorologists use barometers to measure the air pressure. The barometer reading is presented in either inches or centimeters when the barometric pressure is mentioned in weather reports. A mercury column in a cylinder is moved up or down by pressure on the barometer. Barometric pressure readings are taken by examining the marks on the glass cylinder's outside. Inches or centimeters are used to calibrate barometers.

2. Pressure measurements made using mercury

When reporting meteorological conditions on the Earth's surface, the National Weather Service of the United States utilizes inches of mercury. The units of measurement aloft are millibars. It is becoming less common to use millibars and barometers that measure in inches and centimeters.

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Answer:

up up down down

Explanation:

left right left right b a select start

Answer:

a) the ultimate tensile stress is 66717.8 psi

b) the ductility of the material in terms of percent elongation is 26%

Explanation:

Given the data in the question;

ultimate load P = 13,100 lb

elongation δl = 0.52 in

diameter of specimen d = 0.50 in

gage length l = 2.00 inch

First we determine the cross-sectional area of the specimen

A = \(\frac{\pi }{4}\) × d²

we substitute

A = \(\frac{\pi }{4}\) × ( 0.50 )²

A = 0.1963495 in²

a) the ultimate tensile stress σ\(_u\)

tensile stress σ\(_u\) = P / A

we substitute

tensile stress σ\(_u\) = 13,100 / 0.1963495

tensile stress σ\(_u\) = 66717.766 ≈ 66717.8 psi

Therefore, the ultimate tensile stress is 66717.8 psi

b) ductility of the material in terms of percent elongation;

percentage elongation of specimen = [change in length / original length]100

% = [ δl / l ]100

we substitute

% = [ 0.52 in / 2.00 in ]100

= [ 0.26 ]100

= 26

Therefore, the ductility of the material in terms of percent elongation is 26%

Since  Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water, the type of investigation that Charles perform is known as option C:  laboratory experiment.

The term Laboratory experiments is known to be a term that connote any for of research method  which is one where researchers are known to make controllable environments so that they can be able to test hypotheses.

Note that Laboratories are known to be used for academic research such as rooms or specifically set up spaces.

Therefore, based on the above, one can say that since  Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water, the type of investigation that Charles perform is known as option C:  laboratory experiment.

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Charles knows that adding salt to water causes the freezing point of water to be lowered, but he wants to know if rock salt affects the freezing point more than table salt. Charles performed an investigation in his classroom in which he measured the freezing point of 250 mL of water. He used this measurement as his control. Then, he dissolved equal amounts of rock salt and table salt in two identical 250 mL beakers of water. Finally, he measured the freezing points of each beaker of water, analyzed his results, and formed a conclusion. What type of investigation did Charles perform? A. observational field study B. collection of specimens C. laboratory experiment D. model-building

On the vehicle with the circuit depicted, the brake lights are not functional. The technician examines the dmm readings while applying the brakes and notices that a short to ground might be the issue.

Motor vehicles include cars, trucks, motorcycles, vans, and other on- and off-road vehicles, as well as self-propelled agriculture and construction equipment. An airplane is a type of vehicle that can fly, has wings, and one or more engines. Despite the fact that it can also refer to other types of vehicles, such helicopters, the word "aircraft" is usually used to denote planes. Any piece of machinery used to transport goods, live animals, or both is referred to as a vehicle. Cars, trucks, buses, wagons, motorbikes, bicycles, boats, airplanes, and spacecraft are just a few examples of vehicles. Some dictionaries, meanwhile, underline that the phrase only refers to equipment that transports people, live cargo, or goods on land

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Cut that photo by

1. Left click your mouse on the photo

2. Click cut

Then enter the file where you want to transfer and press

1. ctrl+v

Answer:

you can go to your file and then select the phpto and hold on a little bit and choose the delete option

The range of values for the series resistance Rs will depend on the small signal source impedance Zs. Generally, the range of values for Rs should be between (Zs/10) and (Zs/2).

Impedance is a measure of the opposition that a circuit presents to an alternating current (AC) when voltage and current are applied. It is measured in ohms and is the equivalent of resistance in a DC circuit. Impedance is a complex measure that is made up of both resistance and reactance. Resistance is the opposition to the flow of electric current, while reactance is the opposition to the flow of AC current due to inductance or capacitance. Impedance increases with frequency, meaning higher frequencies will experience more opposition than lower frequencies. Impedance also determines how much power is dissipated in a circuit and how much current is drawn from the source. It is important to consider the magnitude of the impedance in a circuit, as too little or too much can cause problems.

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Answer:

Hydraulic conductivity =  878.53 gpd / ft^2

Explanation:

Calculate the hydraulic conductivity of the confined aquifer

Thickness of aquifer ( b )  = 100 ft

Pump rate ( Q ) = 1500 gpm

r₂ =  700 ft

r₁  = 70 ft

h1 = 1 ft , h2 = 10 ft  

To determine the hydraulic conductivity we will apply the relation below

Q = 2πKb (( h2 - h1) / In(r₂ / r₁ ) )

1500 = 2 * π * k * 100  (( -1 -(- 10 ) / In ( 700 / 70 ) )

∴ K ( hydraulic conductivity ) = [ 1500 / (( 9 / 2.30 )  ] / 2π*100

                                                = 383.33 / 628.32

K = 0.610087 gpm /ft^2

   = 878.53 gpd / ft^2