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Calculo 2 De dos variables_9na Edición - Ron Larson

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SECCIÓN 12.1 12.1 Vector-Valued

Funciones vectoriales Functions

839

839

[Las graphs gráficas are labeled están marcadas (a), (b),(c), (c), a), and b), (d).] c) y d).]

11

1. r t

t 1 i t

1. r t

t 1 i t

22 jj 3tk a) a) z z

b) b)

z z

12.1 Exercises Ejercicios See See www.CalcChat.com for for worked-out solutions to to odd-numbered exercises.

En In In los Exercises ejercicios 1–8, 1 a find 8, the hallar the domain el dominio of of the the de vector-valued la función vectorial.

function. In En In Exercises los ejercicios 21–24, a match 24, asociar the the equation cada ecuación with its its con graph. su gráfica.

[The

2. 2. rt rrt t 44 4 t 2 t 2 i i t 2 t j j 6tk

44

44

3. 3. rt rrt t ln ln ti ti ee t jj tk tk

22

22

4. 4. rt rrt t sen

sin sin ti ti 44 cos cos tj tj tk tk

yy

5. 5. rt rrt t Ft Ft t Gt Gt t donde

where

−2 −2 2 2

−2 −2

yy

x

2

4

x 2 2

4

2

Ft Ft t cos cos ti ti sen

sin sin tj tj t t t k, k, Gt Gt t cos cos ti ti sen

sin sin tj tj

xx

6. 6. rt rrt t Ft Ft t Gt Gt t donde where

Ft Ft t ln ln ti ti 5tj 5tj 3t 3t 2 k, k, Gt Gt t i i 4tj 4tj 3t 3t 2 k

c) c) z z

d) d) z z

7. 7. rt rrt t Ft Ft t Gt Gt t donde

where

11

Ft Ft t sen

sin sin ti ti cos cos tj, tj, Gt Gt t sen

sin sin tj tj cos cos tk tk

8. 8. rt rrt t Ft Ft t Gt Gt t donde

where

44

22

Ft Ftt t3 3 i i tj tj tk, tk, Gt t t 3

1

G t 3

1

t t i i

t 2k

1

t 1 j t 2 1

t 1 j t 2 k

xx

11

yy

22

xx

44

yy

En

In In los Exercises ejercicios 9–12, 9 a 12, evaluate evaluar

(if (if (si es possible) posible)

the the la función vector-valued vectorial

en cada valor dado de t.

21.

21. rrt rtt ti ti ti 2tj 2tj t at of

t

function at each given value of

k, k, k, 2 22 ≤ ttt ≤ 2

2

t. t.

9. rt rt costi sintj k, 1 ≤ t ≤ 9.

22. 22. rrt t t ti i t j t t 1j

k, 1 t 1

1

r t 2 t sen

t j t 2 k, 1 t 1

1

9. r t 2 2 i i t t 11j

j

23.

a) r1 b) r0 c) rs 1

23. rrt rtt ti ti ti t t 2 j j e e 0.75t 0.75t k, k, k, 2 22 ≤ t t ≤ 2

2

(a) (a) rr11

(b) (b) rr00

(c) (c) rrs s 11

2t

d)

(d)

r2 t r2

24.

rt ti ln tj 2t 2t

(d) rr22 t t rr22

24. rrtt ti ti ln ln tj tj

≤ t ≤ 0.1 t 5

3 k, 0.1 t 5

3 k,

10.

10. 10. rt

rrt t cos

cos cos ti

ti ti 22 sen sin

sin sin tj

tj tj

25. Para pensar Las cuatro figuras siguientes son gráficas de la

a)

(a)

r0 b)

(b)

r4 c)

25. 25. Think About It It The four figures below are are

(c)

función vectorial rt 4 cos ti 4 sin tj t graphs

Asociar cada

d) r6 t r6

k.

of of the the

(a) rr00

(b) rr 44

(c) rr

vector-valued function rrt t 44 cos cos senti ti 44 sin sin tj tj t t44k.

k.

(d) (d) rr 66 t t rr 66

una de las gráficas con el punto en el espacio desde el cual se ve

11. rt ln ti Match each of of the the four graphs with the the point in in space from

11

la hélice. Los cuatro puntos son

11.

0, 0, 20, 20, 0, 0, (20, 0, 0)

the is are

20 ,

r t ln ti

t j

which the helix is viewed. The four points are

20 ,

11. r t ln ti

t j 3tk

y 20, 20,

10, 0, 020, 0 ,,

10. 20, 20, 0, 0, 00 ,,

and 10, 10, 20, 20, 10 10 . .

a)

(a) (a) r2

rr22

b)

(b) (b) r3

rr 33

c)

(c) (c) rt

r

r t t4

44

(a) (a)

z z

(b) (b)

z z

d)

a) z

b)

z

(d) (d) r1

rr1 t 1 t t r1

rr11

12.

12. 12. rt

rrtt t

t t i i t 32 t 32 jj e t4 e t k

a)

(a) (a) r0

rr00

b)

(b) (b) r4

rr44

c)

(c) (c) rc

rr

cc 2

22

d)

(d) (d) r9

rr9 t 9 t t r9

rr99

xx

x

En In In los Exercises ejercicios 13 13 13 and y 14, 14, find hallar rrt t rt . . .

y

yy

Generated by by Mathematica

y

14. 13. 13.

by rtr rtt t t t i i 3tj 3tj 4tk

Generated by Mathematica

Generada con Mathematica

Generada con Mathematica

13. 14. 14. rtr rt t sen

sin sin 3ti 3ti cos cos 3tj 3tj tk tk

(c) (c)

(d) (d) z z

c) d)

z

En In In los Exercises ejercicios 15–18, a represent 18, representar the the line el segmento from de recta Pto to Qdesde

by by aa

P vector-valued hasta Q mediante function una and función by by a a set set vectorial of of parametric y mediante equations. un conjunto

de ecuaciones paramétricas.

yy

15. 15. P0, 0, 0, 0, 00 , , Q3, 3, 1, 1, 22

16. 16.

P0, 0, 2, 2, 11 , , Q4, 4, 7, 7, 22

y

15. 17. 17.

P(0, 2, 0, 2, 5, 0), 5, Q 33 (3, , , Q( Q( 1, 2) 1, 1, 4, 4, 99

16. P (0, 2, 1), Q (4, 7, 2)

17. 18. 18.

P(2, 1, 1, 6, 5, 6, 8), 3), 8), QQ 3, (1, 3, 2, 4, 2, 559)

yy

18. P (1, 6, 8), Q (3, 2, 5)

xx

y

Generated by Think About It It In In Exercises 19 19 and 20, 20, find Is the

xby Mathematica

Generated by by Mathematica

rrt t ut t . . Is the

Generada con Mathematica

Generada con Mathematica

Para result pensar a a vector-valued En los ejercicios function? 19 Explain. y 20, hallar rt ut. ¿Es el 26. 26. Sketch the the three graphs of of the the vector-valued function

resultado una función vectorial? 11

Explicar.

19. 19. rrt t 3t 3t 11i

i 4t 4t 33 jj 4k, 4k,

utt t 2 t 2 i i 8j 8j t 3 t 3 k

26. rDibujar rtt ti ti

tres tj gráficas

tj 2k 2kas de

as la

viewed

función from

vectorial

each point.

rt ti tj 2k

19. 20. 20. rt rrt t 3t 33 cos 1i t, t, 22 sin sin 1 4tt, 3 t, jt t 4k 2, 2, ,

utut t 4 4 tsin 2 sin i t, t, 8j6 6 cos t 3 t, kt, t 2 t 2

(a) vistas (a) 0, 0, desde 0, 0, 20 20los (b) puntos. (b) 10, 10, 0, 0, 00

(c) (c) 5, 5, 5, 5, 55

20. rt 3 cos t, 2 sin sent, t 2,

ut 4 sen sin t, 6 cos t, t 2 a) 0, 0, 20 b) 10, 0, 0 c) 5, 5, 5

r

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