The statement ‘Technological improvements have allowed people
to inhabit a wider variety of places more easily’ is true. Technology has made
our lives easier and faster. You can just buy a land or house from the
developer to obtain a place you want.
D: slow processes of erosion and deposition shaped the earth
the following C++ function will return true if the given non - negative number is multiple of 5 or 3 else it will return false.
bool function( int x ){
// variable to check if it is multiple of both or not
int number =0;
if(3%x == 0){
number++;
}
if(5%x == 0){
number++;
}
// Now returning by deciding
if( number <=1)
return true;
else
return false
}
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.
