The fraction of nonreflected radiation that is transmitted through a 10-mm thickness of a transparent material is 0.90. If the thickness is increased to 32 mm, what fraction of light will be transmitted

Answer:Falling or flying objects on a worksite can expose workers to relatively minor injuries, such as cuts and abrasions, as well as more serious injuries, such as concussions or blindness. Working beneath scaffolds or other areas where overhead work is being performed puts workers at risk from falling objects. Flying objects become a concern when workers are using power tools or performing tasks that involve pushing, pulling or prying.

Explanation:General

Always wear hard hats when work is being performed overhead or when other work conditions call for it.

Stack materials securely to prevent them from sliding, falling or collapsing.

Overhead work

Secure all tools and materials to prevent them from falling on people below.

Use toe boards or guardrails on scaffolds to prevent objects from falling. Alternately, use debris nets or catch platforms to grab falling objects.

Machine use

When working with machines or power tools that can produce flying particles, wear safety glasses, goggles or face shields.

Inspect tools prior to use, and be sure all guards are in place and in good working condition.

Allow only properly trained workers to use power-actuated tools.

Cranes/hoists

Whenever possible, avoid working under moving loads.

Erect barricades and post warning signs at hazardous work zones.

Inspect cranes and hoists prior to use to ensure all components are in good working order, including wire rope, lifting hooks and chains.

Never exceed the lifting capacity of cranes and hoists.

Compressed air

Reduce compressed air for cleaning to 30 psi, and always use proper personal protective equipment and guarding.

Never clean clothing with compressed air.

False, Plastic is not an organic material in the sense that it will naturally degrade over time.

Plastic is not an organic material in the sense that it will naturally degrade over time. While it is true that plastic is derived from oil, which is an organic material, the process of turning oil into plastic involves complex chemical reactions and polymerization.

This results in the formation of long chains of molecules that are highly resistant to natural degradation processes. In fact, the majority of plastic produced today is designed to be durable and long-lasting, which is why it persists in the environment for hundreds of years.

When plastic waste is disposed of in landfills or released into the environment, it can take centuries to break down. Exposure to sunlight, moisture, and microbial activity can cause some forms of plastic to fragment into smaller pieces, but they do not completely biodegrade like organic materials such as food waste or paper.

Instead, these smaller plastic particles, known as microplastics, can persist in the environment for even longer periods and pose significant threats to ecosystems and wildlife.

It is worth noting that there are ongoing research and development efforts to create biodegradable and compostable plastics. These types of plastics are designed to break down more readily under specific conditions, such as in industrial composting facilities.

However, they are not yet widely adopted or capable of degrading in natural environments. Therefore, the statement that plastic will eventually completely degrade naturally is false.

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For a laminar flow through a pipe, the pressure drop over the length of a smooth pipe will be less compared to that in a rough pipe, if all other flow conditions remain the same.

Pressure drop in a pipe is directly proportional to the length of the pipe, density, flow velocity, and the friction factor. It is inversely proportional to the diameter of the pipe. The laminar flow is a flow condition in which fluid flows in parallel layers without mixing. A rough pipe has the internal roughness, which results in increasing the friction factor of the pipe.

Thus, the pressure drop in a rough pipe is high as compared to a smooth pipe with no internal roughness. The smooth pipe is free from any internal roughness, which means that it is having low frictional resistance as compared to a rough pipe. Therefore, the pressure drop in a smooth pipe is less compared to that in a rough pipe, if all other flow conditions remain the same.

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Answer: South Africa is a constitutional democracy with a three-tier system of government and an independent judiciary.

Explanation: :^ hope this helps u dear!

Answer:

To estimate the mass feed rate of HOCl and NH3 to achieve a monochloramine residual of 1.8 mg/L in a flow rate of 38,000 m^3/d, we need to use the following equations:

C = (M1/M2) * (F1/F2)

Q = C * F2

where:

C = concentration of monochloramine (mg/L)

M1 = molecular weight of HOCl (g/mol)

M2 = molecular weight of NH3 (g/mol)

F1 = mass feed rate of HOCl (g/min)

F2 = flow rate of water (m^3/min)

Q = mass flow rate of monochloramine (g/min)

From the given information, we know that the flow rate of water is 38,000 m^3/d, which is approximately 26.4 m^3/min.

Assuming that the pH of the water is between 7.2 and 8.2, we can use the following equation to estimate the concentration of monochloramine:

C = [HOCl][NH3]/Kb

where:

[HOCl] = concentration of hypochlorous acid (mg/L)

[NH3] = concentration of ammonia (mg/L)

Kb = equilibrium constant for the reaction HOCl + NH3 ↔ NH2Cl + H2O

At pH 7.5, the value of Kb is approximately 3.7 x 10^-7.

Assuming that the ratio of [HOCl] to [NH3] is 1:1, we can write:

C = ([HOCl]^2)/Kb

Solving for [HOCl], we get:

[HOCl] = sqrt(C * Kb)

Substituting the given values, we get:

[HOCl] = sqrt(1.8 * 10^-3 * 3.7 * 10^-7) = 0.0025 mg/L

Since the ratio of [HOCl] to [NH3] is 1:1, we can assume that the concentration of NH3 is also 0.0025 mg/L.

Substituting the values of C, M1, M2, and F2 into the equation Q = C * F2, we get:

Q = 0.0025 * 26.4 * 1000 = 66 g/min

Therefore, the total mass flow rate of monochloramine required to achieve a residual concentration of 1.8 mg/L is 66 g/min, assuming a 1:1 ratio of HOCl to NH3.

lmk if u need more help! :D

The mass feed rate of HOCl is approximately 28.9 g/min, and the mass feed rate of NH₂Cl is approximately 39.5 g/min to achieve a monochloramine residual of 1.8 mg/L in a flow rate of 38,000 m³/d.

To estimate the mass feed rates of HOCl and NH₂Cl to achieve a monochloramine residual of 1.8 mg/L, we can use the following formula:

Mass feed rate = Flow rate x Desired concentration x Molecular weight / 1000

The molecular weight of HOCl is 52.46 g/mol, and the molecular weight of NH2Cl is 51.47 g/mol.

The desired concentration of monochloramine is 1.8 mg/L, or 0.0018 g/L.

The flow rate is given as 38,000 m³/d, which is equivalent to 38,000,000 L/d.

Using the formula above, we can calculate the mass feed rates as follows:

Mass feed rate of HOCl = 38,000,000 x 0.0018 x 52.46 / 1,000 = 28.9 g/min

Mass feed rate of NH2Cl = 38,000,000 x 0.0018 x 51.47 / 1,000 = 39.5 g/min

Therefore, the estimated mass feed rates of HOCl and NH₂Cl are approximately 28.9 g/min and 39.5 g/min, respectively, to achieve a monochloramine residual of 1.8 mg/L in a flow rate of 38,000 m³/d.

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Answer:

C

Explanation: Freedmens Bureau provided resources for southerners and newly freed slaves

Determine whether each function is O(x²), we need to find witnesses C and k such that f(x) < Cg(x) whenever x > k, where g(x) = x².

a) f(x) = 12x + 10:

To establish that f(x) is O(x²), we need to find C and k such that 12x + 10 < Cx² for x > k.

Since the coefficient of x² in g(x) is 1, we can choose C = 13 and k = 1. For x > 1, we have 12x + 10 < 13x², satisfying the condition. Therefore, f(x) is O(x²).

b) f(x) = x² + 1500:

In this case, f(x) is exactly x². Therefore, f(x) is O(x²) as x² is the same order of magnitude.

c) f(x) = x log x:

To determine if f(x) is O(x²), we need to find C and k such that x log x < Cx² for x > k.

Since the logarithmic function grows slower than a quadratic function, we can choose C = 1 and k = 1. For x > 1, x log x < x², satisfying the condition. Therefore, f(x) is O(x²).

d) f(x) = [x] + [x]:

In this case, [x] represents the floor function, which returns the largest integer less than or equal to x. Since both terms inside the brackets are less than or equal to x, we can conclude that [x] + [x] ≤ 2x for all x. Thus, f(x) is O(x).

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All the parts are listed below.

Open System

Closed System

Single Cylinder

Ported Tandem Cylinder

Portless Master Cylinder

A suitable analysis for one discrete independent variable with four levels and one continuous dependent variable would be a one-way analysis of variance (ANOVA) .It allows for the comparison of means across the different levels and provides statistical evidence of any significant differences observed.

ANOVA is used to determine whether there are any significant differences between the means of two or more groups. In this case, the four levels of the discrete independent variable represent the different groups or categories being compared, while the continuous dependent variable represents the measurement or outcome being assessed.

By conducting a one-way ANOVA, we can assess whether there are any significant differences in the mean values of the continuous dependent variable across the four levels of the independent variable. The ANOVA analysis will provide an F-statistic, p-value, and potentially other relevant statistics that help determine the significance of the observed differences.

If the p-value is below a predetermined significance level (usually 0.05), it suggests that there are significant differences between at least two of the groups. In such cases, additional post-hoc tests, such as Tukey's Honestly Significant Difference (HSD) test, can be conducted to identify which specific groups differ significantly from each other.

Overall, a one-way ANOVA is an appropriate analysis to examine the relationship between a discrete independent variable with four levels and a continuous dependent variable. It allows for the comparison of means across the different levels and provides statistical evidence of any significant differences observed.

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Answer:

true

Explanation:

The statement "Safety and environmental training are important in keeping employees safe and free from injuries and illness" is definitely true.

Injury may be characterized as a circumstance of being damaged or injured due to any physical means. This activity impacts the overall health and fitness of an individual.

Employees are working in their respective fields on the basis of their educational background, skills, and interests. But the fact that is common to all forms of employees is safety and security.

This safety prevents the employees from being injured and ill with the help of some crucial safety and environmental training in their respective trades. This approach by their company is beneficial for maintaining the health of their employees as well as the growth of the company.

Therefore, the statement "Safety and environmental training are important in keeping employees safe and free from injuries and illness" is definitely true.

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The expression that represents the correct approach to retrieve a single array element with ReportType 'police' is:

thisOfficial.Reports.hasMatch(\ r -> r.ReportType == typelist.ReportType.TC_POLICE)

Information is stored in arrays. An array is made up of a group of elements used to store data. A scalar integer number called an index, which is assigned to each element in an array, is what makes up the indexing system.

The data size and the data type or data representation of an array's elements must be the same.

On the base address of the array is the first element.

To determine the element's position (or address), which is used to retrieve the element's actual value, three factors must be considered: the base address, the size of the data type, and the index.

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Answer:

Metamorphic manufacturing

Explanation:

I don't know what form of an answer you wanted but I hope this helps :)

Answer:

It should be within 10%

Explanation:

Cranking compression is simply the pressure that builds up inside cylinders when the valves are closed and the piston then moves up the bores to lead to compression of the mixture.

Cranking compression is normally measured in pounds per square inch (PSI).

When checking cranking compression, we should be looking for signs of replication between cylinders. It means that each cylinder should build pressure within about 5 percent of the others under the same number of starter revolutions. Thus, the variation between the highest and lowest readings should not be more than 10%

Answer:

  100 μs

Explanation:

The Thévenin equivalent source impedance is the parallel impedance of the two resistors, so 50 ohms. The R·C product is then ...

  (50 ohms)(2 microfarads) = 100 microseconds

There are a few potential factors that could cause an air compressor to cycle frequently and build air pressure slowly. Here are some possible reasons:

1. Leaks in the system: If there are any leaks in the air compressor system, such as in the hoses or connections, the compressor will have to work harder to maintain the desired pressure, leading to more frequent cycling and slower pressure build-up.

2. Inadequate compressor size: If the compressor is undersized for the demand, it may struggle to keep up with the air pressure requirements. This can result in frequent cycling as it tries to catch up, and a slower build-up of air pressure.

3. Faulty pressure switch: The pressure switch is responsible for turning the compressor on and off at the desired pressure levels. If the switch is malfunctioning, it may cause the compressor to cycle more frequently or fail to shut off properly, leading to slow pressure build-up.

4. Dirty or worn-out compressor components: Over time, the compressor's components, such as valves and filters, can become dirty or worn out. This can restrict airflow and cause the compressor to work harder, resulting in frequent cycling and slower pressure build-up.

To determine the exact cause, it's recommended to inspect the compressor system, check for leaks, and perform any necessary maintenance or repairs.

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Answer & Explanation:

i) If a student foolishly decides to binge drink 21 beers on their 21st birthday, they would consume a total of 21 x 170 = <<21*170=3570>>3570 calories of digestible energy. Since one calorie is equivalent to raising the temperature of one gram of water by one degree Celsius, and one gallon of water is equivalent to 3,785 grams, the student would have consumed enough energy to raise the temperature of 3,785 grams x 3570 calories = 13,678,950 calories of water from 24 °C to 100 °C. This means that the student could have heated 13,678,950 / 100 = <<136789500/100=136789.5>>136789.5 grams of water from room temperature to boiling, which is equivalent to 136789.5 / 3,785 = <<136789.5/3785=36.19>>36.19 gallons of water.

ii) The energy equivalent of the beer consumed by the student is 3570 calories x 4.184 joules/calorie = 14,889.48 joules. Since one BTU is equivalent to 1,055 joules, this energy is equivalent to 14,889.48 joules / 1,055 joules/BTU = <<14889.48/1055=14.15>>14.15 BTU.

iii) If the student had purchased an equivalent amount of electrical energy from the utility company, they would have to pay 14.15 kW-hr x $0.10/kW-hr = $<<14.15*0.1=1.42>>1.42. This is cheaper than buying beer, as a can of beer typically costs more than $1.42.

Based on the information, the tube thickness that should be used is 3.18 mm.

Power = Torque * Angular velocity

100 kW = Torque * (2 * pi * 36 Hz)

Torque = 2212.14 N-m

In this case, the polar moment of inertia is:

J = pi * 50⁴ / 32 = 196250 pi mm⁴

Maximum shear stress = Torque / J

Maximum shear stress = 2212.14 N-m / 196250 pi mm⁴ = 0.0499 MPa

Tube thickness = 2 * ✓(60 MPa / pi * 50²) = 3.18 mm

Therefore, the tube thickness that should be used is 3.18 mm.

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Answer: The failure of engineers working on the Mars Climate-Orbiter to coordinate measurement standards, resulting in a major public embarrassment for NASA, is an example of a communication issue known as cultural difference or cross-cultural communication. This refers to the difficulties that can arise when people from different cultures, with different languages, customs, and communication styles, work together on a project. In this case, the interaction between the British and U.S. teams working on the Mars Climate-Orbiter project is an example of cultural differences that led to communication issues and ultimately resulted in the failure of the project.

Specifically, the engineers from the US team used the imperial system of measurement, while the engineers from the UK team used the metric system, this led to a misinterpretation of the data, and the orbiter was lost due to a miscalculation in the trajectory.

Explanation:

The orientation of the strain gages would need to change if an axial load was applied to the rod. This is because the axial load will cause longitudinal strains in the rod, which are in a different direction than the strains caused by torsion.

The orientation of the strain gages at 45 degrees from the longitudinal member axis would still be valid for measuring strain caused by torsion even if an axial load is applied to the rod. This is because strain caused by axial loading is different from strain caused by torsion. The strain gages positioned at 45 degrees from the longitudinal member axis are only sensitive to strains in the principal tensile and compressive stress directions caused by torsion. Thus, they would not accurately measure the longitudinal strains caused by the axial load. To measure the longitudinal strains, strain gages would need to be positioned along the longitudinal axis of the rod.

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Answer:

This shows that the technological designs are similar to the scientific investigation processes.

Explanation:

Scientists carry out scientific investigations and discoveries. They learn from their environment by investigating the natural world. The scientist investigates by problem identification, research the related information, designing and conceptualizing, investigating and analyzing the results and deriving out conclusions.

Similarly the engineers follow the same step and provide solutions to the problems of the society through their products and technological designs. The engineers first identify the need of the product, design and implement the design to provide solution and then evaluate the solution. These are the similar steps that an engineer follow in a technological design of a product or a solution.

Answer:

True

Explanation:

Answer:

A video camera with onboard storage(whether is a tape or digital memory) will record sound

Even if it doesn't evaluate all 8000 possible combinations, it is still a thorough test. Only a few combinations are tested on the test bench in order to account for all potential outcomes.

An environment known as a test bench or testing workbench is used to confirm the accuracy or reliability of a design or model.

The phrase first appeared when engineers would manually check the accuracy of electronic devices while seated at a lab bench with measuring and manipulation equipment including oscilloscopes, multimeters, soldering irons, wire cutters, etc (DUT).

A test bench is a testing environment where the product under development is put through its paces using hardware and software tools in the context of software, firmware, or hardware engineering. In some circumstances, the program may need to be somewhat updated to function with the test bench, but careful coding can assure.

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Answer:

Engine oil level.

Brake fluid.

Power steering fluid.

True. The design team can require more stringent inspections than required by the building code to ensure that the construction meets their design specifications and standards.

While the building code sets minimum requirements for safety, health, and welfare, the design team may have additional requirements based on their design intent and project specifications. These additional requirements may be necessary to ensure that the project is constructed in a manner that meets their design standards and specifications. The design team can communicate these requirements to the construction team, who can then incorporate them into the construction process. The more stringent inspections can help ensure that the construction meets these additional requirements and that the final project meets the design team's vision.

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Answer:

yea of cose you can do it physical inwesment a long risalt can wery high coletty so do it you can

Answer:

Super critical

1.2 m

Explanation:

Q = Flow rate = \(12\ \text{m}^3/\text{s}\)

w = Width = 3 m

d = Depth = 90 cm = 0.9 m

A = Area = wd

v = Velocity

g = Acceleration due to gravity = \(9.81\ \text{m/s}^2\)

\(Q=Av\\\Rightarrow v=\dfrac{Q}{wd}\\\Rightarrow v=\dfrac{12}{3\times 0.9}\\\Rightarrow v=4.44\ \text{m/s}\)

Froude number is given by

\(Fr=\dfrac{v}{\sqrt{gd}}\\\Rightarrow Fr=\dfrac{4.44}{\sqrt{9.81\times 0.9}}\\\Rightarrow F_r=1.5\)

Since \(F_r>1\) the flow is super critical.

Flow is critical when \(Fr=1\)

Depth is given by

\(d=(\dfrac{Q^2}{gw^2})^{\dfrac{1}{3}}\\\Rightarrow d=(\dfrac{12^2}{9.81\times 3^2})^{\dfrac{1}{3}}\\\Rightarrow d=1.2\ \text{m}\)

The depth of the channel will be 1.2 m for critical flow.