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MakcuM [25]
3 years ago
5

Air, modeled as an ideal gas, enters a well-insulated diffuse operating at steady state at 270K with a velocity of 180m/s. For n

egligible potential energy effects, determine the exit temperature in K. The exit velocity is 48.4 m/s.

Engineering
2 answers:
Natalija [7]3 years ago
6 0

Answer: exit temperature will be 73.2K

Explanation:

Detailed explanation and calculation is shown in the image below

butalik [34]3 years ago
6 0

Answer:

Exit temperature = 285 K

Explanation:

We are given that;

At inlet ;

T1 = 270K

V1 = 180 m/s

At exit;

V2 = 48.4 m/s

Now, from the table i attached, specific enthalpy for air at temperature of 270K is;

h1 = 270.11 Kj/Kg

Mow, Energy equation is given by;

Q' - W' = m'[(h2 - h1) + [(V2² - V1²)/2] + g(z2 - z1)]

The question tells us that potential energy effects are negligible. Thus, it means no work is exerted from or to the system and thus we solve as an adiabatic system.

Thus, Q', W', z1 and z2 are zero. Also, mass flow rate does not exist since there is no work.

So, we have;

0 = [(h2 - h1) + [(V2² - V1²)/2]

Since we are looking for h2 which is the specific enthalpy at exit, let's make it the subject;

h2 = h1 + [(V1² - V2²)/2]

h2 = 270.11 + [(180² - 48.4²)/2]

h2 = 270.11 Kj/Kg + 15.028 Kj/Kg = 285.138 Kj/Kg

From the table attached, at h2 = 285.138Kj/Kg, we have a temperature of approximately 285K

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andrezito [222]

Answer:

New Zealand may use some of these solutions to prevent air pollution

Explanation:

Using public transports.

Recycle and Reuse

No to plastic bags

Reduction of forest fires and smoking

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5 0
3 years ago
You have designed a treatment system for contaminant Z. The treatment system consists of a pipe that feeds into a CSTR. The pipe
IRISSAK [1]

Answer:

0.667 per day.

Explanation:

Our values here are

Q=10m^3/dV_p=15m^3\\V_{cstr}=60m^3\\c_p=2500mg/L\\c_{cstr}=500mg/L

Degradation constant=k and is unknown.

We calculate the concentration through the formula,

cc_{cstr} =\frac{c_{in}}{1+K(V/Q)} \\cc_{cstr}=\frac{c_p}{1+K*\frac{V_{csrt}}{Q}}

Replacing values we have

1+k(\frac{60}{10})=\frac{2500}{500}\\1+k=5\\K(6)=5-1\\K(6)=4\\K=2/3\\K=0.667/day

That is the degradation constant of Z-contaminant

3 0
3 years ago
Write a function which multiplies the values in odd position values by 10. Odd positions in this case refers to the first value
xxMikexx [17]

Answer:

Using linkedlist on C++, we have the program below.

Explanation:

#include<iostream>

#include<cstdlib>

using namespace std;

//structure of linked list

struct linkedList

{

  int data;

  struct linkedList *next;

};

//print linked list

void printList(struct linkedList *head)

{

  linkedList *t=head;

 

  while(t!=NULL)

  {

      cout<<t->data;

      if(t->next!=NULL)

      cout<<" -> ";

     

      t=t->next;

  }

}

//insert newnode at head of linked List

struct linkedList* insert(struct linkedList *head,int data)

{

  linkedList *newnode=new linkedList;

  newnode->data=data;

  newnode->next=NULL;

 

  if(head==NULL)

  head=newnode;

  else

  {

      struct linkedList *temp=head;

      while(temp->next!=NULL)

      temp=temp->next;

     

      temp->next=newnode;

     

      }

  return head;

}

void multiplyOddPosition(struct linkedList *head)

{

  struct linkedList *temp=head;

  while(temp!=NULL)

  {

      temp->data = temp->data*10; //multiply values at odd position by 10

      temp = temp->next;

      //skip odd position values

      if(temp!= NULL)

      temp = temp->next;

  }

}

int main()

{

  int n,data;

  linkedList *head=NULL;

 

// create linked list

  head=insert(head,20);

  head=insert(head,5);

  head=insert(head,11);

  head=insert(head,17);

  head=insert(head,23);

  head=insert(head,12);

  head=insert(head,4);

  head=insert(head,21);    

 

  cout<<"\nLinked List : ";

  printList(head); //print list

 

  multiplyOddPosition(head);

  cout<<"\nLinked List After Multiply by 10 at odd position : ";

  printList(head); //print list

 

  return 0;

}

5 0
3 years ago
How Many years of college do you have To do in order To become a video game developer and designer
Vinvika [58]

Answer:

Video game designers typically have a bachelor's degree in game design, computer engineering, or computer science which takes four to five years to complete. Courses in a game design degree program may include project management, integrated video design and technology, game prototyping and level design.

6 0
3 years ago
In a river reach, the rate of inflow at any time is 350 cfs and the rate of outflow is 285 cfs. After 90 min, the inflow and out
Semenov [28]

Answer:

change in storage =  -310,500 ft^3

intital storage= 3.67 acre ft

Explanation:

Given data:

Rate of inflow = 350 cfs

Rate of outflow = 285 cfs

After 90 min,  rate of inflow = 250 cfs

Rate of outflow = 200 cfs

final storage = 10.8 acre-ft

calculating the average inflow and outflow

average inflow  = \frac{(350+250)}{2} = 300 cfs

average outlow  = \frac{(285+200)}{2} = 242.5 cfs

total amount of water drain during the period of one hour

= (average outflow - average inflow) *60*90

= (242.5 - 300)*60*90 = -310,500

change in storage is calculate as

= -310,500 ft^3

in cubic meter

= -310500/35.315 = 8792.30 cm^3

in acre-ft

= -310,500/43560 = 7.13 acre ft

initial storage = 10.8 - 7.13 = 3.67 acre ft

3 0
3 years ago
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