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Brilliant_brown [7]
3 years ago
8

Can someone pls give me the answer to this?

Engineering
1 answer:
olganol [36]3 years ago
7 0

I think option c 12 is currect

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A cylindrical specimen of a hypothetical metal alloy is stressed in compression. If its original and final diameters are 16.403
Dmitry [639]

Answer:

A certain vehicle loses 3.5% of its value each year. If the vehicle has an initial value of $11,168, construct a model that represents the value of the vehicle after a certain number of years. Use your model to compute the value of the vehicle at the end of 6 years.

Explanation:

8 0
3 years ago
A resistance of 30Ω is placed in a circuit with a 90 volt battery. What current flows in the circuit?
Svetlanka [38]

Answer:

30 Amperes

Explanation:

if    V ⇒ voltage

      I ⇒ current

      R ⇒ resistance

V = IR

90 = I x 30

90/30 = I

3 = I

6 0
2 years ago
A tubular reactor has been sized to obtain 98% conversion and to process 0.03 m^3/s. The reaction is a first-order irreversible
Zolol [24]

Answer:

The conversion in the real reactor is = 88%

Explanation:

conversion = 98% = 0.98

process rate = 0.03 m^3/s

length of reactor = 3 m

cross sectional area of reactor = 25 dm^2

pulse tracer test results on the reactor :

mean residence time ( tm) = 10 s and variance (∝2) = 65 s^2

note:  space time (t) =

t = \frac{A*L}{Vo}   Vo = flow metric flow rate , L = length of reactor , A = cross sectional area of the reactor

therefore (t) = \frac{25*3*10^{-2} }{0.03} = 25 s

since the reaction is in first order

X = 1 - e^{-kt}

e^{-kt} = 1 - X

kt = In \frac{1}{1-X}

k = In \frac{1}{1-X} / t  

X = 98% = 0.98 (conversion in PFR ) insert the value into the above equation then  

K = 0.156 s^{-1}

Calculating Da for a closed vessel

; Da = tk

      = 25 * 0.156 = 3.9

calculate Peclet number Per using this equation

0.65 = \frac{2}{Per} - \frac{2}{Per^2} ( 1 - e^{-per})

therefore

\frac{2}{Per} - \frac{2}{Per^2} (1 - e^{-per}) - 0.65 = 0

solving the Non-linear equation above( Per = 1.5 )

Attached is the Remaining part of the solution

3 0
3 years ago
How do you get A's in school
soldier1979 [14.2K]
By being attentive in classes, taking good notes and making sure to put time fourth into your grades.
5 0
3 years ago
Read 2 more answers
The heat rate is essentially the reciprocal of the thermal efficiency. a)- True b)- False
jeyben [28]

Answer:

a). TRUE

Explanation:

Thermal efficiency of a system is the defined as the ratio of the net work done to the total heat input to the system. It is a dimensionless quantity.

Mathematically, thermal efficiency is

        η =  net work done / heat input

While heat rate is  the reciprocal of efficiency. It is defined as the ratio of heat supplied to the system to the useful work done.

Mathematically, heat rate is

       Heat rate = heat input / net work done

Thus from above we can see that heat rate is the reciprocal of thermal efficiency.

Thus, Heat rate is reciprocal of thermal efficiency.

4 0
3 years ago
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