The temperature T in ° F for Kansas City, Missouri, over a several day period in April can be approximated by T t = − 5.9 cos 0.262 t − 1.245 + 48.2 , where t is the number of hours since midnight on day 1 . a. What is the period of the function? Round to the nearest hour. b. What is the significance of the term 48.2 in this model? c. What is the significance of the factor 5.9 in this model? d. What was the minimum temperature for the day? When did it occur? e. What was the maximum temperature for the day? When did it occur?
The temperature T in ° F for Kansas City, Missouri, over a several day period in April can be approximated by T t = − 5.9 cos 0.262 t − 1.245 + 48.2 , where t is the number of hours since midnight on day 1 . a. What is the period of the function? Round to the nearest hour. b. What is the significance of the term 48.2 in this model? c. What is the significance of the factor 5.9 in this model? d. What was the minimum temperature for the day? When did it occur? e. What was the maximum temperature for the day? When did it occur?
The temperature
T
in
°
F
for Kansas City, Missouri, over a several day period in April can be approximated by
T
t
=
−
5.9
cos
0.262
t
−
1.245
+
48.2
, where
t
is the number of hours since midnight on day
1
.
a. What is the period of the function? Round to the nearest hour.
b. What is the significance of the term
48.2
in this model?
c. What is the significance of the factor
5.9
in this model?
d. What was the minimum temperature for the day? When did it occur?
e. What was the maximum temperature for the day? When did it occur?
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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