Air at 20oC is used to cool a 20 cm × 20 cm circuit board. 4 cm long aluminium (=230 W. m-1.ºC -1) fins are attached to one side of the board. Each fin has a 2 mm × 2 mm square cross section. The upper surface of the board should be maintained at 80oC. Find the required number of fins to achieve the required cooling. Assume the overall effectiveness is 3 and the convective heat transfer coefficient is 20 W. m-2.ºC -1.

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answer:

Yes. I am available. Give me your assignment to solve.

Explanation:

answer:

// here is code in C++.

#include <bits/stdc++.h>

using namespace std;

//main function

int main()

{

  // variable

 int n;

 cout<<"enter a number:";

 // read the input

 cin>>n;

 // find the square root of the absolute value

 float square_root=sqrt(abs(n));

 // print the square_root

 cout<<"square root of "<<n<<" is: "<<square_root<<endl;

  return 0;

}

Explanation:

Read a number from user and assign it to "n".Then find its absolute value with abs() function.Then calculate the square root of the absolute value with sqrt() function.Print the square root of the number.

Output:

enter a number:-17

square root of -17 is: 4.12311

                                                         This is easy

                                                     sinserly Natalie 7 grader (this is not that hard)

Explanation:

A massive asteroid impact would create long-term changes in the atmosphere and climate of the planet. Upon impact, vaporized dirt and rock would fill the atmosphere, blocking sunlight and creating a state of near-permanent darkness and winter-like conditions.