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Marrrta [24]
3 years ago
15

Compare the temperature dependence of Nabarro-Herring and Coble creep. Which is more temperature-sensitive

Engineering
1 answer:
kicyunya [14]3 years ago
7 0
Lower temperatures favor Coble creep and higher temperatures favor Nabbaro–Herring creep because the activation energy for vacancy diffusion within the lattice is typically larger than that along the grain boundaries, thus lattice diffusion slows down relative to grain boundary diffusion with decreasing temperature.
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Cuál de las siguientes es la mejor manera de practicar sus habilidades de tecnología de secundaria?
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3 years ago
What is the braks mean effictive pressure?
OverLord2011 [107]

Engine cylinder pressure

<u>Explanation:</u>

  1. Brake mean effective pressure is a method to calculate  the engine cylinder pressure which  would give the measured brake horsepower. Brake mean effective pressure is used to identify engine efficiency regardless of capacity or engine speed.
  2. It is used to identify engine efficiency.It is measured by means of transducers or pressure gauges.
  3. It is the measure of engine capacity to do work.

7 0
3 years ago
Match the words with their definitions
Pavlova-9 [17]

Wooden 2 X 8's, 10's, or 12's that run parallel to one another and support a floor or ceiling, and supported in turn by larger beams, girders, or bearing walls- <u>Joist</u>

Explanation:

  1. Wooden 2 X 8's, 10's, or 12's that run parallel to one another and support a floor or ceiling, and supported in turn by larger beams, girders, or bearing walls- <u>Joist</u>
  2. A point where a bearing/structural weight is concentrated and transferred to the foundation-<u>Point Load</u>
  3. Includes all exterior walls and any interior wall that is aligned above a support beam or girder-<u>Load Bearing Wall</u>
  4. Plywood substitute made of coarse sawdust that is mixed with resin and pressed into sheets-<u>Particleboard</u>
  5. The replacement of excavated earth into a trench around or against a basement/crawl space foundation wall- <u>Backfill</u>
  6. Continuous 8m" or 10" thick concrete pad installed before and supports the foundation wall or monopost-<u>Footing</u>
  7. Ribbed steel bars installed in foundation concrete walls, footers and poured in place concrete structures designed to strengthen concrete-<u>Rebar</u>
  8. The end, upper, triangular area of a home, beneath the roof-<u>Gable</u>
  9. A manufactured 4X8 wood panel made out of 1-2 wood chips and glue. Often used as a substitute for plywood-<u>OSB</u>
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5 0
3 years ago
A hydraulic jump is induced in an 80 ft wide channel. The water depths on either side of the jump are 1 ft and 10 ft. Please cal
Sphinxa [80]

Answer:

a) The velocity is 42.0833 ft/s

b) The flow rate is 3366.664 ft³/s

c) The Froude number is 0.2345

d) The flow energy dissipated (expressed as percentage of the energy prior to the jump) is 18.225 ft

e) The critical depth is 3.8030 ft

Explanation:

Given data:

80 ft wide channel, L

1 ft and 10 ft water depths, d₁ and d₂

Questions: a) Velocity of the faster moving flow, v = ?

b) The flow rate (discharge), q = ?

c) The Froude number, F = ?

d) The flow energy dissipated, E = ?

e) The critical depth, dc = ?

a) For the velocity:

\frac{d_{2} }{d_{1} } =\frac{1}{2} (\sqrt{1+8F^{2} } -1)

10*2=\sqrt{1+8F^{2} } -1

Solving for F:

F = 7.4162

v=F\sqrt{gd_{1} }

Here, g = gravity = 32.2 ft/s²

v=7.4162*\sqrt{32.2*1} =42.0833ft/s

b) The flow rate:

q=v*L*d_{1} =42.0833*80*1=3366.664ft^{3} /s

c) The Froude number:

v_{2} =\frac{q}{L*d_{2} } =\frac{3366.664}{80*10} =4.2083ft/s

F=\frac{v_{2}}{\sqrt{gd_{2} } } =\frac{4.2083}{\sqrt{32.2*10} } =0.2345

d) The flow energy dissipated:

E=\frac{(d_{2}-d_{1})^{3} }{4d_{1}d_{2}} =\frac{(10-1)^{3} }{4*1*10} =18.225ft

e) The critical depth:

d_{c} =(\frac{(\frac{q}{L})^{2}  }{g} )^{1/3} =(\frac{(\frac{3366.664}{80})^{2}  }{32.2} )^{1/3} =3.8030ft

4 0
3 years ago
What is projectile motion​
Alenkinab [10]

\boxed{\large{\bold{\blue{ANSWER~:) }}}}

  • If an object is given an initial velocity in any direction and then allowed to travel freely under gravity only, it is called a projectile motion
5 0
3 years ago
Read 2 more answers
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