Question

8. The U.S. Standard Atmosphere specifies atmospheric properties as a function of altitude above sea level. The following table shows selected values of temperature, pressure, and density. Altitude (km) -0.5 Temperature (°C) 18.4 Pressure (atm) 1.0607 0.73702 Density (kg/m) 1.2850 0.95697 2.5 -1.1 6 -23.8 0.46589 0.66015 11 -56.2 0.22394 0.36481 20 -56.3 0.054557 0.088911 28 -48.5 50 -2.3 60 -17.2 0.015946 7.8721 X 104 2.2165 X 104 1.0227 X 10-5 1.6216 X 106 0.025076 1.0269 X 103 3.0588 X 10-4 1.9992 X 10-5 3.1703 X 106 80 -92.3 90 -92.3

by using matlab, how can i solve this problem?

Answer 1

You can use MATLAB to plot the given data. There are many options:

However best suitable for this one is that you define four vectors namely A for Altitude, T for Temperature, P for pressure and D for Density.

Define as,

A = [ enter the given data of Altitude with camma or space in between ]

T = [ enter the given data of Temperature with camma or space in between ]

P = [ enter the given data of Pressure with camma or space in between ]

D = [ enter the given data of Density with camma or space in between ]

After that use the plot command to get the required graphs.

plot 2-D line plot Syntax plot(X,Y) plot(X,Y, LineSpec) plot(X1,Y1, ...,Xn, Yn) plot(X1,Y1, LineSpec1, ..., Xn, Yn, Line Specn) plot(Y) plot(Y, LineSpec) plot( -, Name, Value) plot(ax,-) h = plot(_) Description plot(X,Y) creates a 2-D line plot of the data in Y versus the corresponding values in X.

plot (A, T)

plot (A, P)

plot (A, D)

Once plots are ready you can read values of Temperature, Pressure and Density at 70 km Altitude from the corresponding plots.