Taxicab fares. In New York City, taxicabs change passengers $2.50 for entering a cab and then $050 for each one-fifth of a mile (or fraction thereof) traveled. (There are additional charge for slow traffic and idle times, but these are not considered in this problem.) If x presents the distance traveled in miles, then C ( x ) is the cost of the taxi fare, where C ( x ) = $ 2.50 , if x = 0 , C ( x ) = $ 3.00 , if 0 < x ≤ 0.2 , C ( x ) = $ 3.50 , if 0.2 < x ≤ 0.4 , C ( x ) = $ 4.00 , if 0.4 < x ≤ 0.6 , and so on. The graph of C is show below. (Source; New York City Taxi and Limousine Commission.) Using the graph of the taxicab fare function, find each of the following limits. if it exists. lim x → 0.6 − C ( x ) , lim x → 0.6 + C ( x ) , lim x → 0.6 C ( x )
Taxicab fares. In New York City, taxicabs change passengers $2.50 for entering a cab and then $050 for each one-fifth of a mile (or fraction thereof) traveled. (There are additional charge for slow traffic and idle times, but these are not considered in this problem.) If x presents the distance traveled in miles, then C ( x ) is the cost of the taxi fare, where C ( x ) = $ 2.50 , if x = 0 , C ( x ) = $ 3.00 , if 0 < x ≤ 0.2 , C ( x ) = $ 3.50 , if 0.2 < x ≤ 0.4 , C ( x ) = $ 4.00 , if 0.4 < x ≤ 0.6 , and so on. The graph of C is show below. (Source; New York City Taxi and Limousine Commission.) Using the graph of the taxicab fare function, find each of the following limits. if it exists. lim x → 0.6 − C ( x ) , lim x → 0.6 + C ( x ) , lim x → 0.6 C ( x )
Taxicab fares. In New York City, taxicabs change passengers $2.50 for entering a cab and then $050 for each one-fifth of a mile (or fraction thereof) traveled. (There are additional charge for slow traffic and idle times, but these are not considered in this problem.) If x presents the distance traveled in miles, then
C
(
x
)
is the cost of the taxi fare, where
C
(
x
)
=
$
2.50
,
if
x
=
0
,
C
(
x
)
=
$
3.00
,
if
0
<
x
≤
0.2
,
C
(
x
)
=
$
3.50
,
if
0.2
<
x
≤
0.4
,
C
(
x
)
=
$
4.00
,
if
0.4
<
x
≤
0.6
,
and so on. The graph of C is show below. (Source; New York City Taxi and Limousine Commission.)
Using the graph of the taxicab fare function, find each of the following limits. if it exists.
lim
x
→
0.6
−
C
(
x
)
,
lim
x
→
0.6
+
C
(
x
)
,
lim
x
→
0.6
C
(
x
)
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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