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building a power strip

Explain the process of desertification. Include an example of an event that can cause desertification and describe the changes that occur as desertification takes place. Finally, explain the end result of this process.

What is the derivative of cosh(3x^2+1)?

An indestructible bullet 2.00 cm long is fired straight
through a board that is 10.0 cm thick. The bullet strikes
the board with a speed of 420 m/s and emerges with a
speed of 280 m/s. (a) What is the average acceleration
of the bullet as it passes through the board? (b) What is
the total time that the bullet is in contact with the
board? (c) What thickness of board (calculated to
0.1 cm) would it take to stop the bullet, assuming
the bullet’s acceleration through all parts of the board
is the same?

You explain how pool chemicals react to a friend, they tell you, "But I don't understand why the sodium hypochlorite won't react any more with the chloride ions and the hydrogen ions." Knowing that this reaction displays an equilibrium, what would be a good response to their comment? When people sweat, their bodies often exude salts (including chloride ions) and acidic compounds (that produce hydrogen ions when dissolved in water). For this reason, people are asked in public pools to shower before jumping into the pool water.

(1+tan1)(1+tan2)................(1+tan45)?

C PROGRAM
/*Following is a code to find all the possible combinations of the characters of a string ,but it's not giving correct result due do some mistake.Please help

Input - no of characters in string and the string.
Output - all the combinations of characters of the string.

for e.g.

Sample Input :
enter the number of characters in the word you are going to enter 2
enter the word: os

Output(it will be stored in a text file) :
o
s
oo
os
so
ss

*/
#include
#include
int m=0;
void pos(char *a,char *b,int j,int n,FILE *fp,int k);
main()
{ File *fp;
fp=fopen("possibilities.txt","r");
char *a,*b;
int n,j,k;
printf("\nenter the number of characters in the word you are going to enter ");
scanf("%d ",&n);
a=(char*)malloc(n+1 *sizeof(char));
printf("\nenter the word: ");
scanf("%s ",a);
a[n]='\0';
for(k=1;k {
b=(char*)malloc(k+1 *sizeof(char));
b[k]='0';
pos(a,b,0,n,fp,k);
}
print

A simple graph G is self complementry if G is isomorphic to G complement.Show that if G is self complementry,then v==0,1(mod4).

write programm using while to display number from 0 to 5

Write a program which converts any tab characters, ’\t’, occurring in an input file called
mytabs.txt, into a sequence of n spaces, where n is read from the keyboard. The resulting
file is written to myspaces.txt. In other words, if mytabs.txt contains
This file has too many tabs.
where each space above is actually a \t character, then the file myspaces.txt should look
like the following if n = 2
This file has too many tabs.
i did this code : but it's not working why?
#include
#include
int main()
{

char d;
FILE * fin =fopen("mytabs.txt", "r");
FILE * fout =fopen("myspaces.txt", "w");
int n;

printf("Enter n: ");
scanf("%d",&n);

while(fscanf(fin,"%c",&d)!=EOF)
{
if(d =='\t')
{
for(int i=0;i {
fprintf(fout," ");
}
}

else
{
fprintf(fout, "%c", d);
}

}
fclose(fin);
fclose(fout);

return 0;
}

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