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Zepler [3.9K]
2 years ago
14

A. Calculate the diffusion coefficient for magnesium in aluminum at 450°C.

Computers and Technology
1 answer:
SIZIF [17.4K]2 years ago
5 0

Answer:

a) D = 4.88 * 10^(-14) m^2 / s

b)   <em>t </em>= 1.1 hr

Solution:

a) Magnesium in Aluminum diffusion:

D = Do * exp(-Qd / RT)

  =  (1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15)

  = 4.88 * 10^(-14) m^2 / s

D = 4.88 * 10^(-14) m^2 / s

b) The composition remains same at say the distance Xo:

(Cx - Co) / (Cs - Co) = Constant

Xo^2 / D_{550} * <em>t </em>= Xo^2 / D_{450} * 15

D_{550} * <em>t </em>= D_{450} * 15

(1.2 * 10^(-4) m^2 / s) * exp ( - 130,000 / 8.31 * 723.15) * <em>t</em>

(4.88 * 10^(-14) m^2 / s) * 15

by, solving for <em>t </em>we get:

 <em>t </em>= 1.1 hr

So, the time required is 1.1 hr.

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3 years ago
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lbvjy [14]

Answer:

#part a

#sum of first 5 positive number

Sum=5*(5+1)/2

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#part b

# declare age of all

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Mark_age=19

Fatima_age=31

ave_age=(Sara_age+Mark_age+Fatima_age)/3

print("average age of Sara,mark and Fatima is: ",ave_age)

#part c

#find number of times

no_of_times=int(403/73)

print(" number of times when 73 goes into 403 is: ",no_of_times)

#part d

#find remainder

rem=403%73

print("when 403 is divided by 73 then remainder  is: ",rem)

#part e

#calculate 2 to pawer 10

two_pow=2**10

print("2 to power  10 is: ",two_pow)

#part f

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sara_h=54

mark_h=57

diff_h=abs(sara_h-mark_h)

print("The absolute difference between height of Sara and Mark is: ",diff_h)

#part g

#find the minimum among three

print("lowest price among the three($34.99,$29.95,$31.50) is: $",min(34.99,29.95,31.50))

Explanation:

In part a, sum of first 5 positive number is calculated as 5*(5+1)/2.In part b, add the age of three and divide it  by 3. In part c, use "/" to find number of times 73 goes into 403.In part d, use "%" to find remainder when 403 is divide by 73.In part e, 2 to the 10th power is calculated as 2**10.In part f, use abs() to find the absolute  difference.In part g, min() function is used to find lowest among the 3 prices.

Output:

sum of first 5 positive integer is:  15.0                                                                                  

average age of Sara,mark and Fatima is:  24.333333333333332                                                                

number of times when 73 goes into 403 is:  5                                                                              

when 403 is divided by 73 then remainder  is:  38                                                                          

2 to power  10 is:  1024                                                                                                  

The absolute difference between height of Sara and Mark is:  3                                                            

lowest price among the three($34.99,$29.95,$31.50) is: $ 29.95

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Answer:

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struct Employee e1;

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name and idNum are members of the Employee structure and are referenced using the dot notation. e.g.,

struct Employee e1;

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