تم الحل ✓
categoryهندسة ميكانيكية
schoolبكالوريوس
event_available2026-07-14
السؤال
Transcribed Image Text:
Problem Statement: Suppose that a team of three parachutists
(with masses m₁, m₂, and m₂) is connected by a weightless cord
while free-falling at a velocity of v = 5 m/s, as illustrated in
Figure 1.
(a) Draw the force free-body diagram (FBD) for each
parachute and for each FBD derive the mathematical
equation using the Second's newton Law. Note that each
parachute feels a drag force cv, where c denotes the drag
coefficient, and its own weight mg, where g = 9.8m/s².
(10 pts.)
(b) Using the linear equations found in (a) and the values
given in table 1, write the proper system of equations
where a (acceleration), T (tension), and R (tension) are
the three unknowns variables. (5 pts.)
Table 1. Values of mass and drag coefficient.
Mass,
Parachutist
kg
1
23
2824
70
60
40
Drag Coefficient,
kg/s
10
14
17
(c) Express the system of linear equations found in (b) in
matrix form. (5 pts.)
(d) Solve the system of equations derived in (b) with Gauss
elimination. (25 pts.)
(e) Solve the system of equations derived in (b) with Gauss-
Jourdan method. (25 pts.)
Fig. 1. Three-parachutists free-falling while
connected by weightless cords (Figure taken
from 1)
(f) Solve the system of equation derived in (b) with LU decomposition using Crout's
method. (25 pts.)
(g) Use the MATLAB program given in textbook (page 109) in order to corroborate
your answers. Send your script file with the result included. The latter in comment
form using (%). (5 pts.)
Note: Solve (d), (e), and (f) by hand, and show all the procedure.
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