Air with a mass flow rate of 2.3 kg/s enters a horizontal nozzle operating at steady state at 420 k, 350 kpa, and velocity of 3 m/s. at the exit, the temperature is 300 k and the velocity is 460 m/s. using the ideal gas model for air with constant ep=1.011 k/kg. k, determine: (a) the area at the inlet, in m2 (b) the heat transfer to the nozzle from its surroundings, in kw.

(a)

(b)Q= -35.69 KW

Explanation:

Given:

We know that foe air

Mass flow rate for air =2.3 kg/s

(a)

By mass balancing

(b)

Now from first law for open(nozzle) system

Δh=

Q=-15.52 KJ/s

⇒ KW

  Q= -35.69 KW

If heat will loss from the system then we will take negative and if heat will incoming to the system we will take as positive.

answer:

psirginfsngkdfkmv;sorjtpidrnhdklgfnh s;f

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)