Answer:
Find answers below
Explanation:
triangle_char = input('Enter a character: ')
triangle_height = int(input('Enter triangle height: '))
print('')
for j in range (triangle_height):
print((triangle_char) * (j + 1))
#below are sample output that can be gotten with predefined values
$ ./triangles.py
Enter characters: jk
Enter height: 8
j
jj
jjj
jjjj
jjjjj
jjjjjj
jjjjjjj
jjjjjjjj
k
kk
kkk
kkkk
kkkkk
kkkkkk
kkkkkkk
kkkkkkkk
<span>Financial transactions were one of the first purposes of computers. This is where "ticker tapes" came from; early computers were used to keep track of how stocks were performing. Computers in early days used large mainframe systems and punch cards to keep track of this type of data.</span>
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.
