Complete the following problems using Matlab to solve them. Submit your codes as an m-file
according to the homework requirements. It is not required to submit a pdf file for this assignment.
The file will be very simple, essentially the calculator-like expressions you use to generate the answer.
Please use a comment (begins with a %) to identify each problem.
For each problem, write commands that will calculate the answers to the following problems.
1.) (10 pts) The Navy has a rail gun design that launches a projectile at 4,000 m/s. How many
miles per hour is this?
2.) (10 pts) A UAV flies at 62 knots. How many seconds will it take to fly 5 km? (1 knot =
1.15078 mi/hr)
3.) (10 pts) The barometer in my office read 24.3 in Hg. What was the pressure in psi? (there
are 14.7 psi/atm, 1 in Hg = 0.03343 atm)
4.) (10 pts) The SR-71 spy plane flew at least Mach 3.2. How fast is this in miles per hour? (Mach number is
the ratio of an airplane’s speed relative to the speed of sound (a), M = V/a, assume a = 340 m/s)
5.) (10 pts) The solar system on my house (my old house in California) production is shown in the table
below. If I pay a rate of $0.16/kWhr, how much have I paid for electricity so far this year?
Month Power (MWhr)
Jan 0.617
Feb 0.756
Mar 0.926
Apr 1.016
May 1.065
June 0.959
July 0.711
6.) (10 pts) The speed of sound is a function of temperature, 𝑎 = √𝛾𝑅𝑇 where is the ratio of
specific heats ( = 1.4 for ideal air), R = 1716 ft lb/ slug R and T is the absolute temperature.
a. Find the speed of sound for a temperature of 100 oF.
b. Find the temperature associated with a speed of sound of 1000 ft/s.
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