A boat leaves port and follows a course of N 77 ° E at 9 knots for 3 hr and 20 min . Then, the boat changes to a new course of S 28 ° E at 12 knots for 5 hr . a. How far is the boat from port? b. Suppose that the boat becomes disabled. How long will it take a rescue boat to arrive if the rescue boat leaves from port and travels 18 knots? Round to the nearest minute. c. What bearing should the rescue boat follow?
A boat leaves port and follows a course of N 77 ° E at 9 knots for 3 hr and 20 min . Then, the boat changes to a new course of S 28 ° E at 12 knots for 5 hr . a. How far is the boat from port? b. Suppose that the boat becomes disabled. How long will it take a rescue boat to arrive if the rescue boat leaves from port and travels 18 knots? Round to the nearest minute. c. What bearing should the rescue boat follow?
Solution Summary: The author calculates the distance between the port and the boat when it follows the course of N77°E.
A boat leaves port and follows a course of
N
77
°
E
at
9
knots for
3
hr
and
20
min
. Then, the boat changes to a new course of
S
28
°
E
at
12
knots for
5
hr
.
a. How far is the boat from port?
b. Suppose that the boat becomes disabled. How long will it take a rescue boat to arrive if the rescue boat leaves from port and travels
18
knots? Round to the nearest minute.
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.
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