In the following exercises, find the work done by force field F on an object moving along the indicated path. 68. Let F be vector field F ( x , y , ) = ( y 2 + 2 x e y + 1 ) i + ( 2 x y + x 2 e y + 2 y ) j . Compute the work of integral ∫ c F . d r , where C is the path r ( t ) = sin t i + cos t j , 0 ≤ t ≤ π 2 .
In the following exercises, find the work done by force field F on an object moving along the indicated path. 68. Let F be vector field F ( x , y , ) = ( y 2 + 2 x e y + 1 ) i + ( 2 x y + x 2 e y + 2 y ) j . Compute the work of integral ∫ c F . d r , where C is the path r ( t ) = sin t i + cos t j , 0 ≤ t ≤ π 2 .
In the following exercises, find the work done by force field F on an object moving along the indicated path.
68. Let F be vector field
F
(
x
,
y
,
)
=
(
y
2
+
2
x
e
y
+
1
)
i
+
(
2
x
y
+
x
2
e
y
+
2
y
)
j
.
Compute the work of integral
∫
c
F
.
d
r
,
where C is the path
r
(
t
)
=
sin
t
i
+
cos
t
j
,
0
≤
t
≤
π
2
.
Quantities that have magnitude and direction but not position. Some examples of vectors are velocity, displacement, acceleration, and force. They are sometimes called Euclidean or spatial vectors.
-
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p − 1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
p-1
2
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
23
32
how come?
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
The set T is the subset of these residues exceeding
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
Let n = 7, let p = 23 and let S be the set of least positive residues mod p of the first (p-1)/2
multiple of n, i.e.
n mod p, 2n mod p, ...,
2
p-1
-n mod p.
Let T be the subset of S consisting of those residues which exceed p/2.
Find the set T, and hence compute the Legendre symbol (7|23).
The first 11 multiples of 7 reduced mod 23 are
7, 14, 21, 5, 12, 19, 3, 10, 17, 1, 8.
23
The set T is the subset of these residues exceeding
2°
So T = {12, 14, 17, 19, 21}.
By Gauss' lemma (Apostol Theorem 9.6),
(7|23) = (−1)|T| = (−1)5 = −1.
how come?
Shading a Venn diagram with 3 sets: Unions, intersections, and...
The Venn diagram shows sets A, B, C, and the universal set U.
Shade (CUA)' n B on the Venn diagram.
U
Explanation
Check
A-
B
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