1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vlada-n [284]
3 years ago
8

an existing highway-railway at-grade crossing is being redesigned as grade separated to improve traffic operations. The railway

must remain at the same elevation. The highway is being reconstructed to travel under the railway. The underpass will be a sag curve that has an initial grade of -2% and a final grade of 2%. The PVI of the sag curve will be centered under the railway (a symmetrical alignment). The sag curve design speed is 45 mi/h. How many feet below the railway should the curve PVI be located

Engineering
1 answer:
Gekata [30.6K]3 years ago
7 0

Answer:

Please find attached solution

Explanation:

You might be interested in
If an elevator repairer observes that cables begin to fray after 15 years, what process might he or she use to create a maintena
otez555 [7]

Answer:

inductive reasoning

Explanation:

Inductive reasoning is one of the type of reasoning method in which generalized consequences are derived from limited observations. By observing few data, general conclusions are drawn. The conclusions drawn are false in inductive reasoning. In the given situation, the conclusion drawn by the elevator repairer has been drawn by inductive reasoning. His observation of some cables led him to draw the conclusion about all the cables. The result of the reasoning is false.

5 0
3 years ago
Silicon chips are used primarily in ?
VMariaS [17]

Answer:

4th generation computers

5 0
2 years ago
Yield and tensile strengths and modulus of elasticity . with increasing temperature. (increase/decrease/independent)
meriva

Answer:

Yield strength, tensile strength decreases with increasing temperature and modulus of elasticity decreases with increasing in temperature.

Explanation:

The modulus of elasticity of a material is theoretically a function of the shape of curve plotted between the potential energy stored in the material as it is loaded versus the inter atomic distance in the material. The temperature distrots the molecular structure of the metal and hence it has an effect on the modulus of elasticity of a material.

Mathematically we can write,

E(t)=E_o[1-a\frac{T}{T_m}]

where,

E(t) is the modulus of elasticity at any temperature 'T'

E_o is the modulus of elasticity at absolute zero.

T_{m} is the mean melting point of the material

Hence we can see that with increasing temperature modulus of elasticity decreases.

In the case of yield strength and the tensile strength as we know that heating causes softening of a material thus we can physically conclude that in general the strength of the material decreases at elevated temperatures.

6 0
3 years ago
Suppose a student rubs a Teflon rod with wool and then briefly touches it to an initially neutral aluminum rod suspended by insu
Oliga [24]

Answer:

Due to touch of teflon, its charge will reduce but will not go to zero. Some amount of its initial charge will be transferred to Aluminum rod. So, aluminum rod will have a non-zero negative charge.

Explanation:

3 0
3 years ago
A steam turbine receives steam at 1.5MPa and 220oC, and exhausts at 50kPa, 0.75 dry. Neglecting heat losses and changes in kinet
SIZIF [17.4K]

Answer:

Can you make friend with me ?

4 0
3 years ago
Other questions:
  • The moisture in hot, humid, stagnant air surrounding a cold-water pipeline continually diffuses to the cold surface where it con
    14·1 answer
  • Which of the following is not true about Machine Learning?Machine Learning was inspired by the learning process of human beings.
    11·1 answer
  • Sketch the velocity profile for laminar and turbulent flow.
    15·1 answer
  • Underlining words and highlighting dates are part of a student's personal note taking key.
    6·2 answers
  • When welding stick (SMAW) what is the distance between top of bare end of electrode and base metal?
    7·1 answer
  • One who is trained in math, science and physics in order to work in a branch of engineering
    7·2 answers
  • What is the chord length of an airplane called?
    14·1 answer
  • An ideal vapor-compression refrigeration cycle using refrigerant-134a as the working fluid is used to cool a brine solution to −
    12·1 answer
  • Is reinforcement needed in a retaining wall
    5·2 answers
  • The side area of the door shell that is concealed when the door is closed is called the:
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!