Answered: I was going over the equations for the…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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I was going over the equations for the notes in class and I had a thought. Based on the equations in the image, you could get negative propellant mass. So, I coded it in matlab and I got negative mass. How is that possible? I think I used practical values for the velocity and mass ratio and so on. Did I do something wrong?

dv_ideal
g0 = 9.81;
Isp
400;
m_pl
=
=
10000;
= 500;
finert = 0.25;
MR = exp(dv_ideal/(g0*Isp))
MR 12.7869
m_prop= (m_p1* (MR-1)*(1 - f_inert))/(1 - (f_inert*MR))
m_prop= -2.0121e+03

AV ₂.
IDEAL
m PROP
=
4,000 m/s
=
- Jo Ise dr. (miz)
miz
MR₂
= 2.475
mfz
Main (MR₂ - 1) (1 - finert)
/-finert MR₂
4

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Step 1: Write the given data and what is to find

Given:

To find:

Correct expression for propellant mass.

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