Two planes leave the same airport. The first plane leaves at 1 : 00 P .M . and averages 480 mph at a bearing of S 62 ° E . The second plane leaves at 1 : 15 P .M and averages 410 mph at a bearing of N 12 ° W . a. How far apart are the planes at 2 : 45 P .M . ? b. What is the bearing from the first plane to the second plane at that time? Round to the nearest degree.
Two planes leave the same airport. The first plane leaves at 1 : 00 P .M . and averages 480 mph at a bearing of S 62 ° E . The second plane leaves at 1 : 15 P .M and averages 410 mph at a bearing of N 12 ° W . a. How far apart are the planes at 2 : 45 P .M . ? b. What is the bearing from the first plane to the second plane at that time? Round to the nearest degree.
Solution Summary: The author calculates the distance between the two planes at 2:45PM for the given condition.
Two planes leave the same airport. The first plane leaves at
1
:
00
P
.M
. and averages
480
mph
at a bearing of
S
62
°
E
. The second plane leaves at
1
:
15
P
.M
and averages
410
mph
at a bearing of
N
12
°
W
.
a. How far apart are the planes at
2
:
45
P
.M
.
?
b. What is the bearing from the first plane to the second plane at that time? Round to the nearest degree.
1. Show that the vector field
F(x, y, z)
=
(2x sin ye³)ix² cos yj + (3xe³ +5)k
satisfies the necessary conditions for a conservative vector field, and find a potential function for
F.
1. Newton's Law of Gravitation (an example of an inverse square law) states that the magnitude
of the gravitational force between two objects with masses m and M is
|F|
mMG
|r|2
where r is the distance between the objects, and G is the gravitational constant. Assume that the
object with mass M is located at the origin in R³. Then, the gravitational force field acting on
the object at the point r = (x, y, z) is given by
F(x, y, z) =
mMG
r3
r.
mMG
mMG
Show that the scalar vector field f(x, y, z) =
=
is a potential function for
r
√√x² + y² .
Fi.e. show that F = Vf.
Remark: f is the negative of the physical potential energy, because F = -V(-ƒ).
2. Suppose f(x) = 3x² - 5x. Show all your work for the problems below.
University Calculus: Early Transcendentals (4th Edition)
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