Question #350073

Find the direction cosine (l, m, n) of vector r = 3i -2j + 6k b. Given that p = -12 and q = 1. Find a unit vector u such that │u│= 35 and u is the direction of p-3q 5 -1

1
Expert's answer
2022-06-15T14:47:54-0400

a.


r=3i2j+6k\vec{r} = 3\vec{i} -2\vec{j} + 6\vec{k}

r=(3)2+(2)2+(6)2=7|\vec{r}|=\sqrt{(3)^2+(-2)^2+(6)^2}=7

(l,m,n)=(37,27,67)(l, m, n)=(\dfrac{3}{7}, -\dfrac{2}{7}, \dfrac{6}{7})

b.


u=k(123(1)),k(51)\vec{u} =\langle k(-12-3(1)), k(5-1)\rangle

u=15k,4k\vec{u} =\langle-15k, 4k\rangle

u=(15k)2+(4k)2=35|\vec{u}|=\sqrt{(-15k)^2+(4k)^2}=35

241k2=352,k>0241k^2=35^2, k>0

k=35241k=\dfrac{35}{\sqrt{241}}

u=525241,140241\vec{u} =\langle-\dfrac{525}{\sqrt{241}}, \dfrac{140}{\sqrt{241}}\rangle


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!
LATEST TUTORIALS
APPROVED BY CLIENTS