A steady electrical current passes through a 1 cm thick slab of invar (k = 15 W/(m K)), a Ni-Fe alloy whose thermal expansion coefficient from 0 ºC to 230 ºC is lower than that of any other metallic material. The specimen's faces through which the current is passed have dimensions 12 cm x 50 cm, and are maintained at 30°C and 50°C. If the electrical resistivity of invar is 80 μΩ cm, what is the largest current (in A) that can be passed through the metal without the steady-state temperature exceeding 120°C anywhere?

answer:

a

explanation:

angvrswer:

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h

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)