Due to crashes at a railroad crossing in Salem, Oregon, an overpass (with a roadway surface 26 ft above the existing road) is to be constructed on an existing level highway. The existing highway has a design speed of 50 mi/h. The overpass structure is to be level, centered above the railroad, and 180 ft long. What length of the existing level highway must be reconstructed to provide an appropriate vertical alignment
Answer:
Oregon had 19 railroad crossing accidents in 2018, up from 10 in 2013. Marion County has more than most counties, logging 28 since 2008.
Explanation:
It provides explicit guidance to improve railroad crossing safety to support ODOT’s mission of a safe and efficient transporta-tion network, but is not a policy plan. Rather, it is an action plan to help ODOT achieve greater railroad crossing safety.
To establish a suitable vertical alignment, the present level highway's 2115-foot length needs to be rebuilt.
What is Vertical alignment?The ground's gradient and vertical curves are both included in vertical alignment.
For above given example,
Calculating the maximum permitted gradient is possible.
[tex]G = (V^2) / (29.83R)[/tex]
where, G is the gradient,
V is the design speed in mph.
R is the curvature's radius in feet.
[tex]G = (55^2) / (29.83 * 26)[/tex]= 0.72%
Calculating the minimum viewing distance as:
[tex]S = 1.47Vt + 2.3(t^2) / (3.5K) (3.5K)[/tex]
where t is the perception-reaction time in seconds, K is the coefficient of friction, and S is the minimum sight distance in feet.
The minimum sight distance can be estimated as follows using an assumption of a perception-reaction time of 2.5 seconds and a coefficient of friction of 0.3:
524.3 feet are equal to S = 1.47 x 55 x 2.5 + 2.3(2.52)/(3.5 x 0.3)
Now that we know how long the current level highway is,
The overpass's length and the sag curve's length are equal.
The following equation can be used to determine the length of the crest curve:
[tex]L = (S^2) / (8G)[/tex]
where L is the length of the crest curve, S is the shortest sight distance, and G is the highest permitted gradient.
[tex]L = (524.3^2) / (8 * 0.0072) = 188,607.8 ft[/tex]
The length of the sag curve, the length of the crest curve, and the length of the transition curves all make up the entire length of the level highway that needs to be rebuilt.
Assuming a 50-foot-long transition curve, we obtain:
Overall length is equal to 180 + 188,607.8 + (2 x 50) ft.= 2115 feet
Thus, the existing level highway measures 188,887.8 feet in length, which is equal to 2,265,853.6 inches or 2115 feet.
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Your question is incomplete, most probably the complete question is:
Due to crashes at railroad crossing, an overpass (with a roadway surface 26 ft above the existing road) is be constructed on an existing level highway. see illustration below. the existing highway has a design speed of 55 mi/hr. the overpass structure is to be level, centered above the railroad, and 180 ft long.
What is the length of the existing level highway must be reconstructed to provide an appropriate vertical alignment? assume that the sag and crest vertical curves are directly connected (i.e., there is no constant grade section).
At a given point in the high-speed flow over an airplane wing, the local Mach number, pressure and temperature are 0.7,0.9 atm, and 250 K, respectively. Calculate the values of p,, To, p*, T*, and a* at this point.
Answer:
a) p₀ = 1.2484 atm
b) T₀ = 274.5 K
c) p* = 0.6595 atm
d) T* = 228.74 K
e) a* = 303.16 m/s
Explanation:
Given that;
Local Mach number M = 0.7
Pressure P = 0.9 atm
Temperature T = 250 K
First we obtain the following ratios corresponding to Mach Number 0.7 from Appendix(A) table { ISENTROPIC FLOW PROPERTIES }
For M = 0.7; Pressure→ P/P₀ = 0.7209, Temperature; T/T₀ = 0.91075
Now we calculate;
a) value of p₀
we that; P/P₀ = 0.7209
p₀ = p / 0.7209
we substitute
p₀ = 0.9 / 0.7209
p₀ = 1.2484 atm
b) value of T₀
we know that;
T/T₀ = 0.91075
T₀ = T / 0.91075
we substitute
T₀ = 250 / 0.91075
T₀ = 274.5 K
c) value of p*
To obtain value of p*, we say;
(p* / p₀)[tex]_{ma=1}[/tex] = 0.52828
p* = 0.52828 × 1.2484
p* = 0.6595 atm
d) value of T*
To obtain value of T*, we say;
(T* / T₀)[tex]_{ma=1}[/tex] = 0.8333
T* = 0.8333 × 274.5
T* = 228.74 K
e) value of a*
we know that;
a* = √(γRT*)
so
a* = √(1.4 × 287 × 228.74)
a* = √(91907.732)
a* = 303.16 m/s
A transmission channel between two communicating DTEs is made up of three sections. The first introduces an attenuation of 16 dB, the second introduces an amplification of 20 dB, and the third introduces an attenuation of 10 dB. Assuming a mean transmitted power level of 400 mW, determine the mean output power level of the channel. (3 points)
Answer:
the mean output power level of the channel is 100.475 mW
Explanation:
Given the data in the question;
for the first section; attenuation
16 = 10log₁₀ 400/P₂
P₂ = 10.0475 mW
For the second section; amplification
20 = 10log₁₀ p₂/10.0475
p₂ = 1004.75 mW
For the third section; attenuation
10 = 10log₁₀ p₂/1004.75
p₂ = 100.475 mW
i.e the mean output power level is 100.475 mW
or better still overall attenuation channel = ( 16 - 20) + 10 = 6dB
so
6 = 10log₁₀ 400/P₂
p₂ = 100.475 mV
the mean output power level of the channel is 100.475 mW
The one end of a hollow square bar whose side is (10.01) in with (1.01) in thickness is under a tensile stress 102,500 psi and the other end is connected with a U bracket using a double-pin system. Find the minimum diameter of pin is used according to shear strength. Take the factor of safety as 1.5 and σ_all=243 ksi for pin material.
Answer:
The one end of a hollow square bar whose side is (10+N/100) in with (1+N/100) in thickness is under a tensile stress 102,500 psi and the other end is connected with a U bracket using a double-pin system. Find the minimum diameter of pin is used according to shear strength. Take the factor of safety as 1.5 and σ_all=243 ksi for pin material.
Explanation:
first person to awnser gets brainlyest!!
Answer:
ok bet
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.
7fyuum
.
Explanation:
httrr
.
An organization sets its standards for quality according to the best product it can produce.
True
False
Answer:
True!! took the test
Explanation:
Most technicians install rebuilt or new power steering pumps rather than overhauling the defective unit in the shop. True or False?
Answer:
Most technicians install rebuilt or new power steering pumps rather than overhauling the defective unit in the shop.
True
Explanation:
It has been established that most technicians, instead of overhauling the defective power steering pumps, prefer to install rebuilt or revamped pumps or even new pumps when they could have overhauled the unit themselves. Some are afraid that leakage could occur again. They are not confident enough to do the overhauling in-house or some claim that they do not have the time and other tools to carry out the overhauling. Acknowledgedly, overhauling a power steering pump is not a job for the novice. They require experienced and skilled hands to do the hard work.
1. Lift swing arm restraints are to be used only by non-experienced
employees, because they will prevent the vehicle from falling.
O
True
False
Multiple Choice
Which of the following analogies best describes the relationship between urban planning and zoning?
Zoning is like a hammer because it is used as a tool for urban planning.
Zoning is like a butterfly because it is the final form of urban planning.
Zoning is like a stop sign because it is an obstacle to urban planning.
Zoning is like an egg because it is the process from which urban planning emerges.
Answer:
Zoning is like a hammer because it is used as a tool for urban planning.
Which device can connect many computers and sends packets out every port?
A device that can connect many computers and sends packets out of every port is known as Hub.
What is the name of a device that usually connects many computers?The name of the device that usually connects many computers is known as a hub. It typically connects multiple computer networking devices together. It also acts as a repeater in that it amplifies signals that worsen after traveling long distances over connecting cables.
According to the context of this question, a hub usually connects multiple computers together in a Local Area Network (LAN). All types of information are generally processed or sent to the hub is then sent through each port to every device in the network. It is noted that all types of devices are definitely connected to a network hub and share all available bandwidth equally.
Therefore, a device that can connect many computers and sends packets out of every port is known as Hub.
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37. WHICH OF THESE STATEMENTS IS TRUE ABOUT KEEPING CHILDREN SAFE IN
VEHICLES?
A. Infants should not ride in the front seat of vehicles
B. Children under one year and over 20 lbs. should ride buckled up in the front seat
C. The back seat is generally not the safest place in the car for all children 12 years and younger
A
It would be B but I say that it isn't because children under 3 should be riding a buckle up just for safety
Multiple Select
Which of the following do New Urbanists seek to maximize? (Select all that apply.)
suburban sprawl
universal accessibility
automobile traffic
population diversity
Answer:
population and universal
Explanation:
EDG 2021
Explain when single-stranded or multistranded wire should be used.
Which is the maximum length for any opening on the surface of a 2G SMAW guided bend test specimen?
O 1/3 inch
O 1/4 inch
O 1/8 inch
O 1/2 inch
Answer:
1/8 is the maximum length for opening any on the surface of 2 gtam guided bend test specimen
Multiple Choice
Most regional planners work for the federal government.
False
True
Answer:
Most regional planners work for the federal government.- True
Technician A says automotive gasoline engines run on the 2 stroke principal. Technician B says Diesel engine hace less compression than a gasoline engine. Who is correct?
Answer:
both are incorect
Explanation:
2 stroke principal is a mix of gasoline and engine oil a normal gasoline engine does not run on 2 stroke fuel
technician B is also wrong Diesel engines generally generate much higher compersion than gasoline engines
A group of engineers meets with a local farm cooperative to discuss features of a new fertilizer. What stage of the product development life cycle is this?
detailed product design
concept development
product planning
product systems design
Answer:
i think it is concept development
Explanation:
Why must fire extinguishers be routinely maintained
Answer:
Fire extinguishers controls the amount of pollution caused by smoke and burning. Although they have no expiring date, they won't last forever. Extinguishers should work for 5 to 15 years, but fire extinguishers be routinely maintained to make sure they remain effective.
Explanation:
BRAINLEST PLZ
Answer:
Fire extinguishers control the amount of pollution caused by smoke and burning. Although they have no expiring date, they won't last forever. Extinguishers should work for 5 to 15 years, but fire extinguishers are routinely maintained to make sure they remain effective.
what are 3 good wood working projects that are easy
Answer:
I've found makimg cups, spoons/bowls/etc, & transferring images to wooden frames are good.
All of the following are ways to help locate a coolant leak source except?
Dye test
Scan tool
Visual inspection
Pressure test
Answer:
Scan tool
Explanation:
pressure testing is the best way of testing for a colant leak
a scan tool literally does nothing for a coolant leak
In an experiment to determine relative velocities of a feather, ball, and anvil, what is the object called?
relative variable
control variable
dependent variable
independent variable
Which type of memory is programmed at the factory? RAM ROM Cache or Virtual memory
Answer:
RAM, which stands for random access memory, and ROM, which stands for read-only memory, are both present in your computer. RAM is volatile memory that temporarily stores the files you are working on. ROM is non-volatile memory that permanently stores instructions for your computer.
Explanation:
If you are unsure about holding a piece of wood to be drilled, then you should always use a
to secure the place while a.drilling,
B.Clamp
C.farger drill bit
D.Smallor drill bit
E.Awl
If a 180 RPM synchronous motor and gear train rated for 60Hz is run on 50Hz, what speed will the output shaft have?
What was the opening price of Dow Jones Industrial Average on July 06,2017 in the format of XXXXX.XX?
Answer:
hello your question is poorly written hence I will give you a general answer
answer :
Hence the opening price = 140 - ( 14 * 3 )
= 140 - 42 = 98.00
Explanation:
To determine the opening price we will subtract or add the percentage Increase or decrease of the Dow Jones from the Final price of the Dow Jones
Lets assume :
Dow Jones Increased by 30 %
Dow Jones final price = 140
Hence the opening price = 140 - ( 14 * 3 )
= 140 - 42 = 98.00
People with skills and training in areas such as marketing or accounting are an important part of the manufacturing industry.
True
False
Answer:
true
Explanation:
Select the correct text in the passage.
Identify which of the following sentences describes the working of a piezoelectric gauge.
Answer:
The gauge converts the charge into a measurable electrical signal.
Explanation:
trust me
will give brainliest and 10 points
what are 5 good wood working projects that are easy.
Answer:
a bowl, plate,
Explanation:
. Describe the “seven deadly wastes”
Answer:
The original seven wastes, or muda, are transportation, inventory, motion, waiting, overproduction, overprocessing and defects. ... When manufacturers are able to identify the seven wastes, they can correct and prevent further loss of time, money and other resources.
Explanation:
Answer:
transportation, inventory,motion, waiting,overproduction,overprocessing,and defects
Explanation:
they are often referred to by the acronym TIMWOOD
Is (3x+1)(4x-5) the factor form of 12x^2-11x-5?
Answer:
Yes good job
Explanation:
Answer:
Yes
Explanation:
Yes, the factored form of 12x^2-11x-5 is (3x+1)(4x-5)