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3 years ago

Limited time only for christmas give yourself free 100 points Thats what im talking about

Engineering

2 answers:

valentinak56 [21]3 years ago

4 0

Answer:

Free points................

Explanation:

Thanks for the points.

murzikaleks [220]3 years ago

4 0

Ok thanks merry crymust

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You are evaluating the lifetime of a turbine blade. The blade is 4 cm long and there is a gap of 0.16 cm between the tip of the

Tcecarenko [31]

Answer:

Explanation:

Given conditions

1)The stress on the blade is 100 MPa

2)The yield strength of the blade is 175 MPa

3)The Young’s modulus for the blade is 50 GPa

4)The strain contributed by the primary creep regime (not including the initial elastic strain) was 0.25 % or 0.0025 strain, and this strain was realized in the first 4 hours.

5)The temperature of the blade is 800°C.

6)The formula for the creep rate in the steady-state regime is dε /dt = 1 x 10-5 σ4 exp (-2 eV/kT)

where: dε /dt is in cm/cm-hr σ is in MPa T is in Kelvink = 8.62 x 10-5 eV/K

Young Modulus, E = Stress, $\sigma$ /Strain, ∈

initial Strain, $\epsilon_i = \frac{\sigma}{E}$

$\epsilon_i = \frac{100\times 10^{6} Pa}{50\times 10^{9} Pa}$

$\epsilon_i = 0.002$

creep rate in the steady state

$\frac{\delta \epsilon}{\delta t} = (1 \times {10}^{-5})\sigma^4 exp^(\frac{-2eV}{kT} )$

$\frac{\epsilon_{initial} - \epsilon _{primary}}{t_{initial}-t_{final}} = 1 \times 10^{-5}(100)^{4}exp(\frac{-2eV}{8.62\times10^{-5}(\frac{eV}{K} )(800+273)K} )$

but Tinitial = 0

$\epsilon_{initial} - \epsilon _{primary}} = 0.002 - 0.003 = -0.001$

$\frac{-0.001}{-t_{final}} = 1 \times 10^{-5}(100)^{4}\times 10^{(\frac{-2eV}{8.62\times10^{-5}(\frac{eV}{K} )1073K} )}$

solving the above equation,

we get

Tfinal = 2459.82 hr

3 0

3 years ago

Suppose a steam locomotive is rated at 7500 horsepower. If its efficiency is 6%, how much wood must be burned in a 3-hour trip?

Sati [7]

Answer:

50,625kg of wood

Explanation:

Power input = power output ÷ efficiency

Power output = 7500 horsepower = 7500×750W = 5625000W, efficiency = 6% = 0.06

Power input = 5625000/0.06 = 93750000W

Energy input = power input × time

time = 3hour = 3×3600 = 10800sec

Energy input = 93750000 × 10800 = 1.0125×10^12J

Mass = Energy ÷ Energy density = (1.0125×10^12J) ÷ (20×10^6J/kg) = 50,625kg of wood

3 0

3 years ago

What is the first step necessary for initiating the visual transduction cascade in rods?.

irinina [24]

'Capturing a photon by isomerization and rhodopsin of retinal' is the first step necessary for initiating the visual transduction cascade in rods.

Visual transduction refers to the process in the eye where absorption of light in the 'retina' is translated into electrical signals that then reach the brain. It is correct to state that visual transduction is the photochemical reaction that takes place when light or photon is converted to an electric signal in the retina. The visual pigment in the rods, called rhodopsin, is a membrane protein placed in the outer segments of the rods.

When initiating the visual transduction cascade in rods the first vital step is to capture a photon by isomerization and rhodopsin of retinal'.

You can leran more about visual transduction at

brainly.com/question/13798113

#SPJ4

4 0

1 year ago

Diana and Kinsey are put in charge of choosing a mascot for their basketball team. There are fifteen players on the team, but Di

arsen [322]

Answer:

the data are inadequate

Explanation:

If there are 15 people on the team, and only five have been asked about the mascot, this means the data collecting is wrong, and the result doesn’t include thoughts of the majority. If Diana and Kinsey want to have adequate data, they should ask as many as possible, if not all players in the team. This would truly show what the majority wants meaning it will show what the team wants. This kind of complete data correcting is the correct one.

6 0

3 years ago

Determine the complex power, apparent power, average power absorbed, reactive power, and power factor (including whether it is l

LenKa [72]

Answer:

A) complex power = apparent power = ( 108.253 + 62.5 i ) VA

active power = 108.25 watts

reactive power = 62.5 VAR'S

power factor = cos ∅ = cos 30° = 0.866 ( lagging )

also ; current lags voltage by 30°

B) your question is not well written hence no answer

Explanation:

A) v(t) = 100 cos (377t - 30° ) v

Vrms = $\frac{100}{\sqrt{2} }$ ∠ -30°

I(t) = 2.5cos(377t- 60°) A

Irms = $\frac{2.5}{\sqrt{2} }$ ∠ -60°

determine complex power apparent power . ...... power factor

Note : complex power = apparent power

=( Irms ) * Vrms

= ( $\frac{2.5}{\sqrt{2} }$ ∠ -60° ) * ( $\frac{100}{\sqrt{2} }$ ∠ -30° )

= 125 ∠ 30°

= ( 108.253 + 62.5 i ) VA ( complex power )

active power = 108.25 watts

reactive power = 62.5 VAR'S

power factor = cos ∅ = cos 30° = 0.866 ( lagging )

current lags voltage by 30°

4 0

3 years ago