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Multivariable Calculus

8th Edition
James Stewart
ISBN: 9781305266643

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BuyFindarrow_forward

Multivariable Calculus

8th Edition
James Stewart
ISBN: 9781305266643
Textbook Problem

Find the direction cosines and direction angles of the vector. (Give the direction angles correct to the nearest degree.)

36. 1 2 i + j + k

To determine

To find: The direction cosines of the vector and the direction angles of the vector.

Explanation

Given:

12i+j+k (1)

Formula:

Consider three dimensional vector a as follows.

a=a1i+a2j+a3k (2)

Consider a general expression to find magnitude of a three dimensional vector that is a=a1,a2,a3 .

|a|=a12+a22+a32 (3)

Direction cosines are,

cosα=a1|a| (4)

cosβ=a2|a| (5)

cosγ=a3|a| (6)

Compare equations (1) and (2).

a=12,1,1 .

In equation (3), substitute 12 for a1 , 1 for a2 and 1 for a3 .

|a|=(12)2+(1)2+(1)2=14+1+1=94=32

In equation (4), substitute 32 for |a| and 12 for a1 .

cosα=(12)(32)=13

In equation (5), substitute 32 for |a| and 1 for a2 .

cosβ=1(32)=23

In equation (6), substitute 32 for |a| and 1 for a3

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Chapter 12 Solutions

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P-48ESect-12.6 P-49ESect-12.6 P-50ESect-12.6 P-51ESect-12.6 P-52ECh-12 P-1RCCCh-12 P-2RCCCh-12 P-3RCCCh-12 P-4RCCCh-12 P-5RCCCh-12 P-6RCCCh-12 P-7RCCCh-12 P-8RCCCh-12 P-9RCCCh-12 P-10RCCCh-12 P-11RCCCh-12 P-12RCCCh-12 P-13RCCCh-12 P-14RCCCh-12 P-15RCCCh-12 P-16RCCCh-12 P-17RCCCh-12 P-18RCCCh-12 P-19RCCCh-12 P-1RQCh-12 P-2RQCh-12 P-3RQCh-12 P-4RQCh-12 P-5RQCh-12 P-6RQCh-12 P-7RQCh-12 P-8RQCh-12 P-9RQCh-12 P-10RQCh-12 P-11RQCh-12 P-12RQCh-12 P-13RQCh-12 P-14RQCh-12 P-15RQCh-12 P-16RQCh-12 P-17RQCh-12 P-18RQCh-12 P-19RQCh-12 P-20RQCh-12 P-21RQCh-12 P-22RQCh-12 P-1RECh-12 P-2RECh-12 P-3RECh-12 P-4RECh-12 P-5RECh-12 P-6RECh-12 P-7RECh-12 P-8RECh-12 P-9RECh-12 P-10RECh-12 P-11RECh-12 P-12RECh-12 P-13RECh-12 P-14RECh-12 P-15RECh-12 P-16RECh-12 P-17RECh-12 P-18RECh-12 P-19RECh-12 P-20RECh-12 P-21RECh-12 P-22RECh-12 P-23RECh-12 P-24RECh-12 P-25RECh-12 P-26RECh-12 P-27RECh-12 P-28RECh-12 P-29RECh-12 P-30RECh-12 P-31RECh-12 P-32RECh-12 P-33RECh-12 P-34RECh-12 P-35RECh-12 P-36RECh-12 P-37RECh-12 P-38RECh-12 P-1PCh-12 P-2PCh-12 P-5P

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