A curve C is called a flow line of a vector field F if F is a tangent vector to C at each point along C (See the accompanying figure). (a) Let C be a flow line for F( x , y ) = − y i+ x j, and let ( x , y ) be a point on C for which y ≠ 0. Show that the flow lines satisfy the differential equation d y d x = − x y (b) Solve the differential equation in part (a) by separation of variables, and show that the flow lines are concentric circles centered at the origin.
A curve C is called a flow line of a vector field F if F is a tangent vector to C at each point along C (See the accompanying figure). (a) Let C be a flow line for F( x , y ) = − y i+ x j, and let ( x , y ) be a point on C for which y ≠ 0. Show that the flow lines satisfy the differential equation d y d x = − x y (b) Solve the differential equation in part (a) by separation of variables, and show that the flow lines are concentric circles centered at the origin.
A curve C is called a flow line of a vector field F if F is a tangent vector to C at each point along C (See the accompanying figure).
(a) Let C be a flow line for
F(
x
,
y
)
=
−
y
i+
x
j,
and let
(
x
,
y
)
be a point on C for which
y
≠
0.
Show that the flow lines satisfy the differential equation
d
y
d
x
=
−
x
y
(b) Solve the differential equation in part (a) by separation of variables, and show that the flow lines are concentric circles centered at the origin.
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.
Since z = f( a, b, d, c), write the exact differential of the dependent variable.
(1n |t – 1], e', vî )
1. Let 7(t) =
(a) Express the vector valued function in parametric form.
(b) Find the domain of the function.
(c) Find the first derivative of the function.
(d) Find T(2).
(e) Find the vector equation of the tangent line to the curve when t=2.
2. Complete all parts:
(a) Find the equation of the curve of intersection of the surfaces y = x? and z = x3
(b) What is the name of the resulting curve of intersection?
(c) Find the equation for B the unit binormal vector to the curve when t= 1.
Hint: Instead of using the usual formula for B note that the unit binormal vector is orthogonal to 7 '(t) and
7"(t). In fact, an alternate formula for this vector is
ア'(t) × ア"(t)
ア(t) ×デ"(t)|
B(t) =
Chapter 15 Solutions
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University Calculus: Early Transcendentals (4th Edition)
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