(Statics) An annulus is a cylindrical rod with a hollow center. It\'s second mom
ID: 665477 • Letter: #
Question
(Statics) An annulus is a cylindrical rod with a hollow center. It's second moment of inertia is given by:
a.) Using this formula write a function called annulusMoment( ) that accecpts two double precision number as parameters (one for the outter radius and one for the inner radius), calculates the corresponding second moment of inertia , and displays the result.
b.) Include the following written in Exercise 5a in a working program. Make sure your function is called from main( ). Test the function by passing various data to it.
Explanation / Answer
a) public void annulusMoment(double r1,double r2){
I=pi*(Math.pow(r2,4)-Math.pow(r1,4))/4;
System.out.println("Second moment of inertia I: "+I);
}
b) public class Moment {
private double I;
private final double pi=3.14159;
public void annulusMoment(double r1,double r2){
I=pi*(Math.pow(r2,4)-Math.pow(r1,4))/4;
System.out.println("Second moment of inertia I: "+I);
}
public static void main(String[] args) {
Moment m=new Moment();
m.annulusMoment(3.4, 1.2);
m.annulusMoment(4.3, 2.1);
m.annulusMoment(6.6, 5.5);
}
}
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