A refrigeration system cools a brine stream (Cp = 3.6 kJ. kg-1.K -1 ) from 25 C to -20 C at a rate of 18 kg. s -1 . Heat is discarded to the atmosphere at a temperature of 32 C. What is the power requirement (= real work) if the thermodynamic efficiency of the system is 30%?

answer:

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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)