When an aircraft or an automobile is moving through the atmosphere, it must over

Question

When an aircraft or an automobile is moving through the atmosphere, it must overcome a force called drag that works against the motion of the vehicle. The drag force can be expressed as F = 1/2 CD times A times rho times V2 where F is the force (in newtons), CD is the drag coefficient. A is the projected area of the vehicle perpendicular to the velocity vector (in m2), is the density of the gas or fluid through which the body is traveling (kg/m3), and V is the body's velocity. The drag coefficient CD has a complex derivation and is frequently an empirical quantity. Sometimes the drag coefficient has its own dependencies on velocities: For an automobile, the range is from approximately 0.2 (for a very streamlined vehicle) through about 0.5. For simplicity, assume a streamlined passenger vehicle is moving through air at sea level (where rho = 1.23 kg/m3). Write a program that allows a user to input A and CD interactively and calls a function to compute and return the drag force. Your program should call the drag force function repeatedly and display a table showing the drag force for the input shape for a range of velocities from 0 m/s to 40 m/s in increments of 5 m/s.

Explanation / Answer

#include<stdio.h>
#define density 1.23 // Density 1.23 kg/m^3
double force(double,double,int);//Function to calculate the force

int main()
{
   double drag_coefficient,area;//Defining CD and area
   printf("Enter drag_coefficient = ");
   scanf("%lf",&drag_coefficient);
   printf("Enter area perpendicular to the velocity vector = ");
   scanf("%lf",&area);
   printf("Drag_Coefficent   Area    Velocity   Force ");
   printf("======================================================= ");
   int velocity;
   for(velocity=0;velocity<=40;velocity=velocity+5)//Calculating the force for velocity from 0 to 40 m/s
   {
       double f = force(drag_coefficient,area,velocity);
       printf("%lf   %lf   %d   %lf ",drag_coefficient,area,velocity,f);

   }

}

double force(double drag_coefficient, double area,int velocity)//Function for calcuting the force
{
   double f;
   f = 0.5*drag_coefficient*area*density*velocity*velocity;
   return f;

}

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