The data in the table represent the duration of daylight d t (in hours) for Houston, Texas, for the first day of the month, t months after January 1 for a recent year. a. Enter the data in a graphing utility and use the sinusoidal regression tool (SinReg) to find a model of the form d t = a sin b t + c + d . b. Graph the data and the resulting function.
The data in the table represent the duration of daylight d t (in hours) for Houston, Texas, for the first day of the month, t months after January 1 for a recent year. a. Enter the data in a graphing utility and use the sinusoidal regression tool (SinReg) to find a model of the form d t = a sin b t + c + d . b. Graph the data and the resulting function.
Solution Summary: The author calculates a model of the form d(t)=amathrmsin (bt+c )+d for the given data by using
The data in the table represent the duration of daylight
d
t
(in hours) for Houston, Texas, for the first day of the month,
t
months after January
1
for a recent year.
a. Enter the data in a graphing utility and use the sinusoidal regression tool (SinReg) to find a model of the form
d
t
=
a
sin
b
t
+
c
+
d
.
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.
Using and Understanding Mathematics: A Quantitative Reasoning Approach (6th Edition)
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