798 CAPÍTULO 11 Vectores y la geometría del espacio11.4 EjerciciosEn los ejercicios 1 a 6, calcular el producto vectorial de los vectoresunitarios y dibujar su resultado.1. 2.3. 4.5. 6.En los ejercicios 7 a 10, calcular a) b) v u y c)En los ejercicios 11 a 16, calcular u v y probar que es ortogonaltanto a u como a v.Para pensarEn los ejercicios 17 a 20, usar los vectores u y vmostrados en la figura para dibujar en un sistema dextrógiro unvector en la dirección del producto vectorial indicado.17. 18.19. 20.En los ejercicios 21 a 24, usar un sistema algebraico por computadorapara encontrar u v y un vector unitario ortogonal a uy a v.25. Programación Dadas las componentes de los vectores u y v,escribir un programa para herramienta de graficación que calculey26. Programación Usar el programa escrito en el ejercicio 25 paraencontrar y para yÁreaEn los ejercicios 27 a 30, calcular el área del paralelogramoque tiene los vectores dados como lados adyacentes. Usarun sistema algebraico por computadora o una herramienta degraficación para verificar el resultado.27. 28.29. 30.ÁreaEn los ejercicios 31 y 32, verificar que los puntos son losvértices de un paralelogramo, y calcular su área.ÁreaEn los ejercicios 33 a 36, calcular el área del triángulo conlos vértices dados. (Sugerencia:es el área del triánguloque tiene u y v como lados adyacentes.)37. Momento Un niño frena en una bicicleta aplicando una fuerzadirigida hacia abajo de 20 libras sobre el pedal cuando lamanivela forma un ángulo de 40° con la horizontal (ver la figura).La manivela tiene 6 pulgadas de longitud. Calcular elmomento respecto a P.Figura para 37 Figura para 3838. Momento La magnitud y la dirección de la fuerza sobre uncigüeñal cambian cuando éste gira. Calcular el momento sobreel cigüeñal usando la posición y los datos mostrados en la figura.39. Optimización Una fuerza de 56 libras actúa sobre la llave inglesamostrada en la figura que se encuentra en la página siguiente.a) Calcular la magnitud del momento respecto a O evaluandoUsar una herramienta de graficación para representarla función de q que se obtiene.b) Usar el resultado del inciso a) para determinar la magnituddel momento cuandoc) Usar el resultado del inciso a) para determinar el ángulocuando la magnitud del momento es máxima. ¿Es la respuestalo que se esperaba? ¿Por qué sí o por qué no?In Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the athat has the given vectors as adjacealgebra system or a graphing utility t27. 28.29. 30.AreaIn Exercises 31 and 32, verifvertices of a parallelogram, and find i31.32.AreaIn Exercises 33–36, find the argiven vertices. Hint:is the aandas adjacent sides.33.34.35.36.37. Torque A child applies the brakesdownward force of 20 pounds onmakes aangle with the horizont6 inches in length. Find the torque aFigure for 37Fig38. Torque Both the magnitude and tha crankshaft change as the crankshon the crankshaft using the position a39. Optimization A force of 56 pounshown in the figure on the next pag(a) Find the magnitude of the momUse a graphing utifunction of(b) Use the result of part (a) to detemoment when(c) Use the result of part (a) to detemagnitude of the moment is mayou expected? Why or why not?45 ..OA \ F .40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6,A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5vv 1, 2, 3uu 3, 2, 1vv j kuujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CAS1053714_1104.qxp 10/27/08 11:46 AM Page 798In Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASOA \ F.0.16 pie2 000 libras60°40°P6 pulgF = 20libras12 u v v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j ku jv 3, 8, 5.u 2, 6, 10u vu vu v.u vu u vv uv uu vxyvu 4 64 3 2 1 645231zv v.u v,k ii kk jj ki jj iIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 , B 6, 5, 1 , C 7, 2, 2 , D 3, 6, 4A 0, 3, 2 , B 1, 5, 5 , C 6, 9, 5 , D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CASIn Exercises 1–6, find the cross product of the unit vectors andsketch your result.1. 2.3. 4.5. 6.In Exercises 7–10, find (a) (b) and (c)7. 8.9. 10.In Exercises 11–16, findand show that it is orthogonal tobothand11. 12.13. 14.15. 16.Think About It In Exercises 17–20, use the vectors andshown in the figure to sketch a vector in the direction of theindicated cross product in a right-handed system.17. 18.19. 20.In Exercises 21–24, use a computer algebra system to findand a unit vector orthogonal toand21. 22.23. 24.25. Programming Given the vectors and in component form,write a program for a graphing utility in which the output isand26. Programming Use the program you wrote in Exercise 25 tofind and for andAreaIn Exercises 27–30, find the area of the parallelogramthat has the given vectors as adjacent sides. Use a computeralgebra system or a graphing utility to verify your result.27. 28.29. 30.AreaIn Exercises 31 and 32, verify that the points are thevertices of a parallelogram, and find its area.31.32.AreaIn Exercises 33–36, find the area of the triangle with thegiven vertices. Hint:is the area of the triangle havingandas adjacent sides.33.34.35.36.37. Torque A child applies the brakes on a bicycle by applying adownward force of 20 pounds on the pedal when the crankmakes aangle with the horizontal (see figure). The crank is6 inches in length. Find the torque atFigure for 37 Figure for 3838. Torque Both the magnitude and the direction of the force ona crankshaft change as the crankshaft rotates. Find the torqueon the crankshaft using the position and data shown in the figure.39. Optimization A force of 56 pounds acts on the pipe wrenchshown in the figure on the next page.(a) Find the magnitude of the moment aboutby evaluatingUse a graphing utility to graph the resultingfunction of(b) Use the result of part (a) to determine the magnitude of themoment when(c) Use the result of part (a) to determine the anglewhen themagnitude of the moment is maximum. Is the answer whatyou expected? Why or why not?45 ..OA \ F .O0.16 ft2000 lb60°P.40A 1, 2, 0 , B 2, 1, 0 , C 0, 0, 0A 2, 7, 3 , B 1, 5, 8 , C 4, 6, 1A 2, 3, 4 , B 0, 1, 2 , C 1, 2, 0A 0, 0, 0 , B 1, 0, 3 , C 3, 2, 0vu12 u vA 2, 3, 1 ,B 6, 5, 1,C 7, 2, 2 ,D 3, 6, 4A 0, 3, 2 ,B 1, 5, 5 ,C 6, 9, 5 ,D 5, 7, 2v 1, 2, 0v 1, 2, 3u 2, 1, 0u 3, 2, 1v j kv j ku i j kujv 3, 8, 5 .u 2, 6, 10uvuvu v .uvvuv 1.5i 6.2kv 0.4i 0.8j 0.2ku 0.7ku 3i 2j 5kv 10, 12, 2v 2.5, 9, 3u 8, 6, 4u 4, 3.5, 7v.uu vu u vvuvuuvyvu 64 3 2 1 645231zvuv 2i j kv 2i j ku i 6ju i j kv 5, 3, 0v 1, 2, 1u 10, 0, 6u 2, 3, 1v 0, 1, 0v 2, 5, 0u 1, 1, 2u 12, 3, 0v.uu vv 1, 5, 1v 1, 1, 5u 3, 2, 2u 7, 3, 2v 2i 3j 2kv 3i 2j 5ku 3i 5ku 2i 4jv v.v u,u v,kiikkjjkijji798 Chapter 11 Vectors and the Geometry of Space11.4 Exercises See www.CalcChat.com for worked-out solutions to odd-numbered exercises.CAS
SECCIÓN 11.4 11.4 El producto The Cross vectorial Product de of of dos Two vectores Vectors en in el in Space espacio 79911.4 The Cross Product of Two Vectors in Space 79911.4 The Cross Product of Two Vectors in Space 7VolumenEn los ejercicios 47 y encontrar el volumen of del180 libras lbIn Exercises 47 and 48, find the volume of theF F180 lbparalelepípedo parallelepiped with que tiene the given vértices vertices.dados (ver las figuras).B Bθ θθVolume In Exercises 47 and 48, find the volume of theAF180 lbVolume In Exercises 47 and 48, find the volume ofF180 lb47. parallelepiped 0, 0, 0, 0, 0 ,, 3, 3, with 0, 0, 0 , the , 0, 0, given 5, 5, 1 ,, vertices. 2, 2, 0, 0, 518 18 18 pulg in.B θparallelepiped with the given vertices.AB θ3, 5, , 5, 0, , 2, 5, , 5, 5, θ3, 5, 1 5, 0, 5 2, 5, 6 5, 5, 6θθFF12 pulg 12 12 in.A47. 0, 0, 0 , 3, 0, 0 , 0, 5, 1 , 2, 0, 518 in.47. 0, 0, 0 3, 0, 0 , 0, 5, 1 , 2, 0, 518 in.48.0, 3, 0, 0, 5, 0, 01 ,, 0, 5, 0, 4, 0, 4, 05 ,, 2, 3, 5, 3, 0, 60, 0 , , 5, , 5, 1, 61, 1, 1, 530° 30°θ F 12 in.3, 5, 1 5, 0, 5 , 2, 5, 6 , 5, 5, 6θ F 12 in.48. 0, 3, 0, 3, 4, 04, , 0 0, ,, 4, 1, 01, 5, , 5, 5 3, ,, 0, 4, 04, 1, , 1, 5 1, ,, 1, 4, 54, 5, 5, 5O48. 0, 0, 0 , 0, 4, 0 , 3, 0, 0 , 1, 1, 530°15 pulg 15 15 in.A A30°49. Si If If u3, 4, v 0 , 0y1, u 5, 5 v ,3, 4,0, 0, 4, 1,0 ,¿qué what 5 ,1,se5,can puede 4, 5,5 ,you 5concluir 4,conclude 1, 5 ,acerca about4, 5,de5uOy v?Figura Figure para for 39 39 O Figura Figure para for 40 4015 in. Aandv?15 in. 49. If uAv 0 y u v 0, what can you conclude about u50. 50. Identificar Identify the los dot 49.productos products If uvectoriales that v are 0 yequal. u vque Explain 0,son iguales. your whatExplicar reasoning.can you conclude abouel40. 40. Figure Optimización Optimization for 39Figure Una A force fuerza of offor 39de 180 180 Figure pounds libras for actúa acts 40 sobre on the Figure el soporte bracketand v?for 40 razonamiento. (Assume u, u, v, v, and (Suponer and ware v?que nonzero u, v vectors.) y w son vectores distintos demostrado shown in in en the la figure.figura.50. Identify the dot products that are equal. Explain your reasoning.40. Optimization A force of 180 pounds acts on the bracket40. Optimization A force of 180 pounds acts on thea) cero.) 50. Identify the dot products that are equal. Explain your reasonibracketa) u v wb) b) v w ua) (a) Determinar Determine el the vector vector \AB AB \\y and el the vector vector F Fque representing representa the(Assume u, v, and w are nonzero vectors.)shown the figure.la(Assume u, v, and w are nonzero vectors.)shown in the figure.fuerza. force. (F ( F( estará will be en in in términos terms of of de .) .)c).)a) c) u u v v wwd) b) d) uv w w u v(a) Determine the vector AB \and the vector F representing thea) u v wb) v w u(a) Determine the vector AB \and the vector representing theb) (b) Calcular Find the la magnitude del of of the momento moment respecto abouta by A evaluando evaluatingF e) e) u w vf f ))w v uforce. ( F will be in terms of .) Ac) u v wd) u w vforce. ( will be in terms of .)c) u v wd) u w v\ F AB AB \\ F. F ..g) g) u v wh) h)u v(b) Find the magnitude of the moment about A by evaluating e) u w vf ) w v u(b) Find the magnitude of the moment about by evaluating e) u w vf ) w v uc) (c) Usar Use AAB el \the resultado F . of of del part inciso (b) to to b) determine para determinar the magnitude la magnitud of of theAB \ g) u v wh) w u vdel moment momento whencuando 30 ..F .WRITING g) u ABOUT v w CONCEPTSh) w u v(c) Use the result of part (b) to determine the magnitude of the(c) Use the result of part (b) to determine magnitude of thed) (d) Usar Use el the resultado of of del part inciso (b) to to b) determine para determinar the angleel when ángulothe51. Define the cross product of of vectors uandv. v.moment when 30 .WRITING ABOUT CONCEPTSwhen 30 .WRITING ABOUT CONCEPTScuando magnitude la magnitud of of the moment del momento is is maximum. es máxima. At that A angle, ese ángulo, whatDesarrollo 52. State the geometric de conceptosproperties of of the cross product.(d) Use the result of part (b) determine the angle when the51. Define the cross product of vectors u and v.¿cuál is is the es relationship relación (d) entre between Use the los result the vectores vectors of part F y F(b) to ¿Es determine \lo Is que it the se angle when 51. Define the cross product of vectors u and v.AB and \ ? AB \ ?Is it whatmagnitude of the moment is maximum. At that angle, what 51. 53. 52. Definir If State If the the magnitudes el geometric producto of of vectorial properties two vectors de of los are the vectores doubled, cross product. u y how v. will theesperaba? you expected? ¿Por qué Why sí magnitude o or or por why qué not?of no? the moment is maximum. At that angle, what 52. State the geometric properties of the cross product.is the relationship between the vectors F and ABmagnitude of of the cross product of of the vectors change? Explain.\? Is it what 52.is the relationship between the vectors F and AB \ ?53. DarIs itIfwhatthe las magnitudes propiedades of geométricas two vectors del are producto doubled, vectorial. how will thee) (e) Usar Use you una expected? a herramienta graphing Why utility de or why graficación to to not? graph para the representar function for la funciónla magnitud of del momento respecto a A para 0° £ . q 53. Si magnitude las magnitudes of the crossthe53. If the magnitudes of two vectors are doubled, how will thyou expected? Why or why not?£magnitudede product dos vectores of the vectorsof the crossse duplican, change?product of¿cómo Explain.magnitude of the moment about A for 0 180 . Findthe vectorssechange? Explain(e) Use a graphing utility graph the function for the180°. the zero Hallar of of el the cero (e) function Use de la a función in in graphing the given el utility domain. dominio to Interpret dado. graph Inter-themodificará la magnitud del producto vectorial de los vectores?Explicar.function CAPSTONEfor themagnitude of the moment about A for 0 180 . Findpretar meaning el significado of of the zero magnitude del in in cero the context en of el the contexto of moment of the problem. del about problema. A for 0 180 . Findthe zero of the function in the given domain. Interpret the CAPSTONE54. The vertices of of a triangle in in space arex 1 , 1 , y 1 , 1 , zz 11 ,,x 2 , 2 , y 2 , 2 , zz 22 ,,the zero of the function in the given domain. Interpret theCAPSTONEEn los ejercicios 41 a 44, calcularmeaning of the .3 , 3 , z 3 .to In Exercises meaning 41–44, of the find zero u in v the w context . of the problem.and x 3 , y 3 , z 3 . Explain how to find a vector perpendicularuzero.in the context of the problem. v wPara54. Theto to the discusiónvertices of a triangle in space are xtriangle.54. The vertices of a triangle 1 , y 1 , zin 1 , xspace 2 , yare 2 , zx 2 ,1 y 1 , z 1 , x 2 , y 2 , zand x 241. In Exercises uii41–44, find u v 42. w . u 1, 1, 1, 1, 13 , y 3 , z 3 . Explain how to find a vector perpendicularand x Explain how to find a vector perpendicula41. In Exercises 41–44, 42. find u v w .3 , y 3 , z 3 .u iu 1, 1, 154. Los to the vértices triangle. de un triángulo en el espacio son x j2, 1, to the triangle.1 , y 1 , z 1 ,41. vvu j ji42. v41. u i vu 2, 2,1, 1,1,1, 001x 2 , y 2 , z 2 , y x 3 , y 3 , z 3 . Explicar cómo encontrar un vector42. u 1, 1, 1wkw 0, 0, 0, 0, 1True perpendicular or or False?In al Exercises triángulo.55–58, determine whether thewv kjv j wv 0,2,0,1,10v 2, 1, 0 statement is is true or false. If If it it is is false, explain why or give an43. u 2, 0, 2, 0, 43. uw 2,k2, 0, 144. u0, 1 w k 44. uw 2, 2,0, 0,0,0, 001True or False? In Exercises 55–58, determine whether thew 0, 0, 1 ¿Verdadero example that o falso? shows True it it En is or is false.los False? ejercicios In Exercises 55 a 58, determinar 55–58, determine si la whetherv 0, 0, 3, 3, 0v 1, 1, 1, 1, 1statement is true or false. If it is false, explain why or give an43.vu 0,2,3,0,0144.43. 44.declaración es verdadera statement o falsa. is true Si or es false. falsa, If explicar it is false, por explain qué o why or giveu 2, 0, 1 vu 1,2,1,0,10u 2, 0, 0 55. example It It is is that possible shows to to it find is false. the cross product of of two vectors in in aw 0, 0, 0, 2, dar un ejemplo que example demuestre that shows que es it falsa. is false.wv 0,0, 0,0,3, 0,101wv 0, 3, 0 wv 0,1, 0,2,1, 2,212v 1, 1, 1 two-dimensional coordinate system.55. It is possible to find the cross product of two vectors in aVolumew In 0, Exercises 0, 155. Es posible encontrar 55. It el is producto possible vectorial find the de dos cross vectores product en of un two vectors inw45 and 0, 46, 0, 1use the w triple 0, 2, scalar 2 product w 0, to to 2, 2 56. If two-dimensional If uand vare vectors coordinate space system. that are nonzero and nonparallel,Volumen find the volume En los of of ejercicios the parallelepiped 45 y 46, having usar el adjacent triple producto edgesu, u, sistema thenu de v coordenadas v two-dimensional u. u. bidimensional. coordinate system.Volume In Exercises 45 and 46, use the triple scalar product to 56. If u and v are vectors in space that are nonzero and nonparallel,escalar v, v, andw. para encontrar Volume el volumen In Exercises del paralelepípedo 45 and 46, use que the triple tiene scalar 56. 57. product Si If If u y tov 0son and vectores u56. vIf uen and u el vw,espacio are thenvectors vque in w. son space distintos that are de nonzero cero y and nonparalfind the volume of the parallelepiped having adjacent edges u, then u v v u.como aristas adyacentes find the u, volume v y w. of the parallelepiped having adjacent edges no paralelos, u, entonces then u v v u.45. v,and u w. ii jj46.u 1, 1, 3, 3, 158. If If 0, 0, u v u w,and u v u w,thenv w.v, and w.57. If u 0 and u v u w, then v w.45. u 46.57. Si y u 57. v If u w, 0 and entonces u vv uw.w, then v w.v ijj jkuv 1, 0, 0, 3, 6, 6, 145. u i j46. u 1, 3, 6145. u i j46. u 1, 3, 1 58. In 58. Exercises If u 0,Si 0, 59–66, u v 58. prove u w,If u w, the andy 0, uproperty u u v v uof of uthe w,w,and entonces cross thenu product.v w.v v uw.w, then v w.w j i i kvw 0, 6, 4, 4, 6v j kv 0, 6, 60, 0, 4w i k v j k w 4, 0, 4 v 0, 6, 6 En 59. In Exercises los u ejercicios v 59–66, w uIn Exercises a prove 66, v demostrar the property u wz59–66, la prove propiedad of the crossthe property del product. productow i zkw zz4, 0, 4of the cross product.w i kw 4, 0, 4vectorial.60.c u v cu v u cvzz59. u v w u v u wzz59. u v w u v u w22z66vz 59. 61. 60.uc u v u v 0w cu u v v u u cv w6 4 v60. c u v cu v u cv2460. 62. 61.cu v v w cuu vv uw26 vu u 0 cvv24226uv61. u u 0w44 61. 63. 62.u u v is orthogonal w0u to vto both w uandv. v.vy62. u v w u v w4 uyw v6y8v4 2 6 2 62. 64. v w 0if if and u only v if if wuand vare scalar multiples of of each1w1yuu2 w 4 w863. u v is orthogonal to both u and v.26y u63. u v is orthogonal to both u and v.22y8 yother.1 u 2x4 6yw863. 64. u y ves ortogonal 0 if and only tanto if a uand como v are a v. scalar multiples of each4x6y864. u v 0if and only if uand v are scalar multiples of ea2x1 u 2w65. Prove that u v u v if u and v are orthogonal.21 u 2w 64. uother. v 0 si y sólo other. si u y v son múltiplos escalares uno del otro.x266. thatu w u w v u v w.xx65. 65. Demostrar Prove that que u65. uv Prove vu that u v ifuvu and si v u vy are vu son orthogonal.vortogonales.if u and v are orthogonal.67. 66. Demostrar Prove Prove Theorem thatuque66. u11.9.v Prove vw that wu u u wv wvu w u v w.u vw. w v u v w.67.67.DemostrarProve Theoremel teorema11.9.11.9.67. Prove Theorem 11.9. 30.
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