An approach path for an aircraft landing is shown in the figure and satisfies the following conditions: (i) The cruising altitude is h when descent starts at a horizontal distance l from touchdown at the origin. (ii) The pilot must maintain a constant horizontal speed v throughout descent. (iii) The absolute value of the vertical acceleration should not exceed a constant k (which is much less than the acceleration due to gravity). 1. Find a cubic polynomial P ( x ) = a x 3 + b x 2 + c x + d that satisfies condition (i) by imposing suitable conditions on P ( x ) and P ′ ( x ) at the start of descent and at touchdown.
An approach path for an aircraft landing is shown in the figure and satisfies the following conditions: (i) The cruising altitude is h when descent starts at a horizontal distance l from touchdown at the origin. (ii) The pilot must maintain a constant horizontal speed v throughout descent. (iii) The absolute value of the vertical acceleration should not exceed a constant k (which is much less than the acceleration due to gravity). 1. Find a cubic polynomial P ( x ) = a x 3 + b x 2 + c x + d that satisfies condition (i) by imposing suitable conditions on P ( x ) and P ′ ( x ) at the start of descent and at touchdown.
Solution Summary: The author analyzes the cubic polynomial P(x)-2hl3x
An approach path for an aircraft landing is shown in the figure and satisfies the following conditions:
(i) The cruising altitude is
h
when descent starts at a horizontal distance
l
from touchdown at the origin.
(ii) The pilot must maintain a constant horizontal speed
v
throughout descent.
(iii) The absolute value of the vertical acceleration should not exceed a constant
k
(which is much less than the acceleration due to gravity).
1. Find a cubic polynomial
P
(
x
)
=
a
x
3
+
b
x
2
+
c
x
+
d
that satisfies condition (i) by imposing suitable conditions on
P
(
x
)
and
P
′
(
x
)
at the start of descent and at touchdown.
4. Use method of separation of variable to solve the following wave equation
მłu
J²u
subject to
u(0,t) =0, for t> 0,
u(л,t) = 0, for t> 0,
=
t> 0,
at²
ax²'
u(x, 0) = 0,
0.01 x,
ut(x, 0) =
Π
0.01 (π-x),
0
Solve the following heat equation by method of separation variables:
ди
=
at
subject to
u(0,t) =0, for
-16024
ძx2 •
t>0, 0 0,
ux (4,t) = 0, for
t> 0,
u(x, 0) =
(x-3,
\-1,
0 < x ≤2
2≤ x ≤ 4.
ex
5.
important aspects.
Graph f(x)=lnx. Be sure to make your graph big enough to easily read (use the space given.) Label all
6
33
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