Ventilation systems are critical to ensuring the safety of our underground workers. They provide fresh, cool air while diluting and removing flammable gases and machine exhaust gases.
What exactly is ventilation?The goal of ventilation management systems is to protect the health and safety of underground workers by creating and implementing structured plans, procedures, and processes for the day-to-day operations of the mine ventilation system. When an upset condition occurs, the implementation of ventilation management programmes consists of audit, verification, and corrective action procedures to: (1) ensure regulatory compliance, or (2) return to compliance and safety standards. This paper describes how to create and implement a ventilation management programme in an operating environment to ensure regulatory compliance, increase safety, improve operational efficiency, lower operating costs in an operating mine. This paper discusses two case studies. The first case is presented to show how a ventilation management programme was used in response to a site inspection and audit, followed by the implementation of corrective action. The second case study describes how the development and implementation of a ventilation management programme for an active underground hard rock mine significantly improved air quality conditions.
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The amount of energy derived from an electric source, commonly measured in volts is called
The amount of energy derived from an electric source, commonly measured in volts is called voltage.
Step by step explanation:
Voltage is the electric potential difference between two points in a circuit, which measures the energy needed to move a unit charge from one point to another. The unit for measuring voltage is the volt (V). Voltage is frequently known as electric potential, electric tension, and electric pressure. Voltage can be defined as the amount of potential energy transferred from an electric source to an electric load per unit charge.
The formula for voltage is: V = W / Q
where V represents voltage, W represents work, and Q represents charge. Voltage is measured in volts (V). Voltage can be changed by using a transformer in a circuit, which can raise or decrease the voltage of an AC power supply. A transformer can be used to raise or decrease the voltage of an AC power supply in a circuit. Voltage regulation can also be achieved with a voltage regulator, which can maintain a fixed voltage level despite changes in load resistance or input voltage.
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A truck comes to a stop from an initial forward speed of 95 km/hr in a distance of 65 m with uniform deceleration. Determine whether or not the crate strikes the wall at the forward end of the flat bed. If the crate does not strike the wall, enter a value of 0, otherwise, calculate its speed relative to the truck as the impact occurs. The coefficients of friction between the flat bed of the truck and the crate are ms = 0.21 and mk = 0.16. The distance between the crate and the foward end of the flat bed is 3m.
Fmax > F, the crate remains stationary with respect to the truck when the truck comes to a stop. Therefore, vr = 0 m/s,
The data given in the question is as follows:
The initial speed of the truck = 95 km/h = 26.389 m/s
Stopping distance = 65 m
Deceleration = -a distance of the crate from the end of the flatbed = 3m
Coefficient of static friction = μs = 0.21
Coefficient of kinetic friction = μk = 0.16
To determine whether or not the crate strikes the wall at the forward end of the flatbed, we need to find the maximum distance the crate can travel without striking the wall. Let's begin by finding the deceleration of the truck using the first equation of motion,
Final velocity (v) of truck = 0m/s,
Initial velocity (u) of truck = 26.389 m/s,
Distance traveled (s) = 65m,
Deceleration (a) = ?v^2 - u^2 = 2as
a = (v^2 - u^2) / (2s)a
= (0 - 26.389^2) / (2 × 65)
a = -17.26 m/s^2
Now, let's find the maximum distance the crate can travel without striking the wall.
We can find this using the equation of motion,s = ut + 1/2 at^2
where,u = initial velocity of crate = 0m/s,
a = deceleration of truck = -17.26 m/s^2,
t = time taken by truck to stop =?
s = distance traveled by crate = 3m
Using the third equation of motion,v = u + at⇒ 0 = u + at⇒ t = -u/a = 0/17.26 = 0s
Therefore,s = ut + 1/2 at^2= 0 + 1/2 (-17.26) (0)^2= 0
The maximum distance the crate can travel without striking the wall is zero, which means the crate strikes the wall when the truck stops.
Now, let's find the speed of the crate relative to the truck as the impact occurs.
Let, vr = speed of crate relative to truck,
u = initial speed of crate with respect to the truck,
μs = coefficient of static friction between the flatbed and the crate,
μk = coefficient of kinetic friction between the flatbed and crate,
s = distance traveled by the crate before striking the wall.
The maximum force of static friction that can act on the crate before it starts sliding is given by Fmax = μsN
where N = normal force acting on the crate. As the crate is at rest relative to the truck, the normal force acting on the crate is given by, N = mg
where,m = mass of the crate = 5 kg,g
acceleration due to gravity = 9.8 m/s^2
Therefore, N = 5 × 9.8 = 49 N
Now, Fmax = μsN= 0.21 × 49 = 10.29 N
If the maximum force of static friction is less than the force required to keep the crate stationary, the crate will start sliding. The force required to keep the crate stationary is given by
F = mgsinθ
where,θ = angle of inclination of the flat bed to the horizontal.
Now, let's calculate the force required to keep the crate stationary. The angle of inclination of the flatbed is zero, which means the force required to keep the crate stationary is
F = mg × 0 = 0
Since Fmax > F, the crate remains stationary with respect to the truck when the truck comes to a stop.
Therefore, vr = 0m/s, which is the final answer.
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in the 1850's, the hottest new technology was the telegraph. messages or telegrams could be sent via electrical forces traveling through a wire. write a program that will generate a bill for sending a telegram and give the user the opportunity to translate a message into morse code. the amount owed for sending a telegram is based on the number of words sent. customers are charged at a rate of $1.50 for blocks of 5 words and $0.50 for single words. named constants must be used in the calculation. for now, your program will only translate a single letter into morse code. in the next project, you will add the functionality to translate an entire message. use the tables below to translate letters into morse code.
To write a program that will generate a bill for sending a telegram and give the user the opportunity to translate a message into morse code, follow the steps given below.
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true/false. markov chain and determinant show that if 0 is an eigen value then cofactor matrix equal product of eigen value
False. The claim regarding the cofactor matrix and eigenvalues is not directly related to Markov chains and determinants.
The assertion itself is erroneous as well. The cofactor matrix is not always the same as the sum of the eigenvalue and the identity matrix when the eigenvalue of a matrix is 0. The matrix of determinants of the (n-1) x (n-1) matrices produced by deleting one row and one column from A, multiplied by (-1)(i+j), where I and j are the row and column indices of the element being removed, is known as the cofactor matrix for a matrix A. The answers to the equation det(A - I) = 0, where is an eigenvalue and I is the identity matrix, are the eigenvalues of a matrix A. These ideas, which are closely related to matrix algebra and linear algebra, are thoroughly researched in mathematics and fields that are related to it.
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False. Markov chain and determinant are not directly related to the statement that if 0 is an eigenvalue, then the cofactor matrix is equal to the product of eigenvalues.
In linear algebra, if 0 is an eigenvalue of a matrix, then the determinant of that matrix is 0. However, the cofactor matrix is not necessarily equal to the product of the eigenvalues. The cofactor matrix is a matrix that is used to calculate the inverse of a matrix, and it is related to the adjugate matrix, which is the transpose of the matrix of cofactors.
The product of the eigenvalues is equal to the determinant of the matrix, but this does not necessarily mean that the cofactor matrix is equal to the product of the eigenvalues.
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True or false: One factor that influences successful catching, which relates specifically to the visual observation of the object, is the amount of time of object contact with the hand and fingers.
The statement "One factor that influences successful catching, which relates specifically to the visual observation of the object, is the amount of time of object contact with the hand and fingers" is False.
What is Visual Observation?
Visual observation refers to the process of observing an object with the use of eyes. Visual observation is widely used in various fields, such as science and medicine, as well as art and design. It is one of the most common ways of gathering information about the environment and the world around us.
In catching a ball, what is the factor that influences successful catching?
The factor that influences successful catching is not the visual observation of the object. Rather, it is the trajectory of the object and the velocity at which it is moving. In addition, the timing of the catch, the position of the hands and fingers, and the force applied when catching the ball are all factors that determine successful catching. The statement is False.
The amount of time of object contact with the hand and fingers does not influence successful catching. Successful catching is influenced by various other factors, such as the velocity and trajectory of the object, timing, hand and finger position, and the force applied.
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in a distributor ignition system, what rotates under the distributor cap to send the high voltage to each spark plug wire?
In a distributor ignition system, the rotor rotates under the distributor cap to send the high voltage to each spark plug wire.
The rotor is a small, cylindrical component that is typically made of plastic with a conductive metal tip on the end. It is attached to the distributor shaft and rotates at the same speed as the engine's crankshaft. As the rotor rotates, it passes over a series of metal contacts, known as the distributor cap terminals, which are connected to the spark plug wires. When the rotor passes over a terminal, it completes the circuit and sends a high voltage pulse to the corresponding spark plug wire, which ignites the fuel in the engine's cylinders.
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Determine the moment of the force about point O. Assume F = 750 lb. (Figure 1) Express your answer to three significant figures and include the appropriate units.
The moment of the force is 3750 lb-ft, where lb-ft stands for pound-feet, the unit of torque or moment.
To determine the moment of the force about point O, we need to calculate the perpendicular distance between the line of action of the force and point O. From the figure, we can see that the distance is given by the distance between points O and B, which is 5 feet. Therefore, the moment of the force about point O is given by:
Moment = F x d = 750 lb x 5 ft = 3750 lb-ft
Torque, also known as moment or moment of force, is a measure of the twisting force that causes an object to rotate around an axis or pivot point. It is a vector quantity, which means it has both magnitude and direction. The magnitude of torque is given by the product of the force applied and the perpendicular distance between the axis of rotation and the line of action of the force.
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Which method could be used to convert a numeric value to a string? a str b value cnum d chr True/False: Both of the following for clauses would generate the same number of loop iterations: for num in range (4): for num in range (1,5): What is the result of the following statement? x = random.randint (5, 15) * 2 a A random integer from 5 to 15, multiplied by 2, assigned to the variable x b A random integer from 5 to 15 assigned to the variable x C A random integer from 5 to 15, selected in 2 steps, assigned to the variable x d A random integer from 5 to 15, raised to the power of 2, assigned to the variable A(n) _gives information regarding the line number(s) that caused an exception. a) Reverse b) Traceback block c) Exception d) Try block Which block gets executed even if the error occours or it doesn't a. Finally b. Try c. Except d. Else What would you use if an element is to be removed from a specific index? a del statement b remove method Cindex method d slice method True/False: Strings can be written directly to a file with the write method, but numbers must be converted to strings before they can be written. Which mode specifier will open a file but will not let you change the file or write to it? a w br
Answer:
Which method could be used to convert a numeric value to a string? a str b value cnum d chr True/False: Both of the following for clauses would generate the same number of loop iterations: for num in range (4): for num in range (1,5): What is the result of the following statement? x = random.randint (5, 15) * 2 a A random integer from 5 to 15, multiplied by 2, assigned to the variable x b A random integer from 5 to 15 assigned to the variable x C A random integer from 5 to 15, selected in 2 steps, assigned to the variable x d A random integer from 5 to 15, raised to the power of 2, assigned to the variable A(n) _gives information regarding the line number(s) that caused an exception. a) Reverse b) Traceback block c) Exception d) Try block Which block gets executed even if the error occours or it doesn't a. Finally b. Try c. Except d. Else What would you use if an element is to be removed from a specific index? a del statement b remove method Cindex method d slice method True/False: Strings can be written directly to a file with the write method, but numbers must be converted to strings before they can be written. Which mode specifier will open a file but will not let you change the file or write to it? a w br
Explanation:
a) str method could be used to convert a numeric value to a string.
True. Both for clauses would generate the same number of loop iterations.
a) A random integer from 5 to 15, multiplied by 2, assigned to the variable x.
b) Traceback block gives information regarding the line number(s) that caused an exception.
a) Finally block gets executed even if the error occurs or it doesn't.
b) remove method is used to remove an element from a specific index.
False. Both strings and numbers can be written directly to a file with the write method.
b) r mode specifier will open a file but will not let you change the file or write to it.
Answer:
To convert a numeric value to a string, the method that could be used is "str."
True. Both "for" loops will generate the same number of iterations.
The result of the statement "x = random.randint(5, 15) * 2" is a) A random integer from 5 to 15, multiplied by 2, assigned to the variable x.
The information regarding the line number(s) that caused an exception is given by the traceback block.
The block that gets executed even if the error occurs or not is the "finally" block.
To remove an element from a specific index, we can use the "del" statement.
True. Strings can be written directly to a file with the write method, but numbers must be converted to strings before they can be written.
The mode specifier that will open a file but will not let you change the file or write to it is "r" (read-only) mode.
Explanation:
to submit tenders for a structure to help people safely cross the river at KwaDukuza The Thukela Municipality placed a tender request in the newspaper asking contractors village. Municipalities are not allowed to choose a contractor without giving as many contractors as possible a chance to apply. This is to stop anyone from being favoured over others, and to prevent corruption. Each contractor writes a tender document, which is a description of their plan for the project and shows how much they will charge to complete the work. The job is given to the contractor who presents the best plan at the lowest price. You are going to build a structure to help the community. Read the story again and then investigate the different bridges below to decide which structure will be the best solution for the problem.
Answer:
In general, the choice of bridge design will depend on various factors such as the location, the environment, the length of the span, the expected traffic, the budget, and the construction time. Different types of bridges, such as beam bridges, arch bridges, suspension bridges, and cable-stayed bridges, have different strengths and weaknesses, and are suitable for different situations.
Some factors to consider when choosing a bridge design include:
Span: If the river is wide, a longer span bridge such as a suspension or cable-stayed bridge may be required.
Location: The local geology, topography, and environmental conditions may dictate the type of bridge that can be built.
Budget: Some bridge designs are more expensive than others. A beam bridge may be the most cost-effective option.
Traffic: If the bridge will carry heavy vehicles or high volumes of traffic, a stronger, more durable bridge such as a cable-stayed bridge may be required.
Ultimately, the choice of bridge design will depend on a careful evaluation of these factors and the needs of the community. It is important to consult with experts and stakeholders to ensure that the chosen design is safe, effective, and meets the requirements of the project.
Explanation:
ANSWER : PONTOON BRIDGES
OR SUSPENSION BRIDGES
PONTOON BRIDGES:
take a bunch boats or rafts
tie them together
put a path/road on top of them
if a boat can carry a truck then so can a pontoon bridge
armies use them
smaller cost & safe
SUSPENSION BRIDGES:
source of strength its flexibility to wind,gravity, physical considerations
can be made of steel
but even cheaply with rope or jute etc.
When considering the strength in terms of load-bearing capacity and versatility, truss bridges are often considered to be the strongest type of bridge. Truss bridges are made up of interconnected triangles that distribute weight evenly across the structure, making them highly resistant to bending and compression forces. They are also relatively easy to construct using simple materials such as wood or steel, which may make them a more practical option for underserved communities.
That being said, arch bridges can also be quite strong and durable, as they rely on the inherent strength of their curved shape to distribute weight. Suspension and cable-stayed bridges, on the other hand, require more advanced engineering and construction techniques, and may be less feasible for communities with limited resources. Beam bridges are typically the simplest type of bridge, but may not be as strong or versatile as truss or arch bridges.
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The nozzle has a diameter of 40 mm. Assume water is ideal fluid, that is, incompressible and frictionless (Figure 1) Part A If it discharges water with a velocity of 20 m/s against the fixed blade, determine the horizontal force exerted by the water on the blade. The blade divides the water evenly at an angle of θ-45° Express your answer to three significant figures and include the appropriate units. Figure 1 of 1 F-Value Units 40 mm Submit Request Answer Provide Feedback Next
From the given information, we can calculate the flow rate of water through the nozzle as follows:
Q = A * V
where Q is the flow rate, A is the cross-sectional area of the nozzle, and V is the velocity of the water.
The cross-sectional area of the nozzle can be calculated as:
A = (π/4) * d^2
where d is the diameter of the nozzle.
Substituting the given values, we get:
A = (π/4) * (0.04 m)^2 = 0.0012566 m^2
The flow rate can now be calculated as:
Q = A * V = 0.0012566 m^2 * 20 m/s = 0.02513 m^3/s
The force exerted by the water on the blade can be calculated using the momentum equation:
F = ρ * Q * V * tan(θ-45°)
where ρ is the density of water, and θ is the angle at which the water hits the blade.
Assuming a density of water to be 1000 kg/m^3, we get:
F = 1000 kg/m^3 * 0.02513 m^3/s * 20 m/s * tan(θ-45°)
Substituting θ = 45° (since the water is hitting the blade at an angle of θ-45°), we get:
F = 1000 kg/m^3 * 0.02513 m^3/s * 20 m/s * tan(0°) = 0 N
Therefore, the horizontal force exerted by the water on the blade is 0 N. This is because the water hits the blade at a perpendicular angle and there is no component of force in the horizontal direction.
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