Question

PLEASE ONLY DO D IN MATLAB. I DID A B AND C, dont need them.

Intro to Computers for Engineers Recitation 11 In today's class, we are modeling a spacecraft. Please submit all functions you write. Pay very careful attention to names. If you name a function differently from what you are instructed, things might not work. Test your code using the scripts siml.m and sim2.m before trying to submit on zyLabs. A. [Submit on zyLabs] Write a function that creates a structure variable called createSpacecraft. The function should take four inputs, a number called mass (in kg), a number called fuel (in joules of energy), a number called orbit (in meters), and a number called engine (in newtons). It should return an output structure called spacecraft containing each of those values. Ple ase ensure that both the function name, AND the names of variables within the spacecraft structure are exactly as instructed B. [Submit on zyLabs] In order to stay in a stationary orbit, spacecraft need to be travelling certain velocity. That velocity is given by the formula: at a Gm orbit +e Vorbit Where G is the gravitational constant 6.67x 101 m2/s kg. m, is the mass of the earth, 5.98 x104kg, r, is the radius of the earth, which is 6,370,000m, and orbit is the height of the orbit above the planet. Write a function called gravCale that takes an orbital height as an input and returns a velocity as an output c. Spacecraft sometimes need to adjust their orbit, or move from one orbit to another. Since spacecraft carry limited amount of fuel, it is crucial to be as efficient as possible with fuel when making orbital adjustments. Hohmann Transfer is known as the best solution to this problem. apogee Av m. m.r h Av perigee Target Orbit Hohmann Transfer Orbit Initial Orbit E

Answer 1

As you have already written the code for the previous questions, I use the names for the variables a given in the question, so it wont be difficult for you.

function[spacecraft,status]=checkfuel(spacecraft,delta_v1,delta_v2)

status=false

m=spacecraft.mass

F=spacecraft.engine

fuel=spacecraft.fuel

alpha=F/m

time=(abs(delta_v1)-abs(delta_v2))/alpha

energy=F*m*time

if energy<fuel

   status=true

  spacecraft.fuel=fuel-energy

spacecraft.mass=mass-(spacecraft.fuel/(c*c))

end #for the if statement

end    #for the function