2. Find u × v, v × u, and v × v. u = 5i + 6k v = 6i + 7j − 6k. (a)    u × v (b)    v × u (c)    v × v

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
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Chapter0: Preparing For Algebra
Section0.8: Area
Problem 7E
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Can you show all work and the picture is for #9

2. Find u × v, v × u, and v × v.

u = 5i + 6k
v = 6i + 7j − 6k.
(a)    u × v
(b)    v × u
(c)    v × v
 
3.Find u × v, v × u, and v × v.
u = <1,-9,6>
v = <-2,3,-7>
(a)    u × v
(b)    v × u
(c)    v × v
 
4.Consider the following.
u = <4,-1,0>
 v = <-4,5,0>
Find u ✕ v.
Determine if u ✕ v is orthogonal to both u and v by finding the values below.
u · (u ✕ v) =
v · (u ✕ v) =
u × v is orthogonal to both u and v.
u × v is not orthogonal to both u and v.    
 
5.Consider the following.
u = <-4,3,3>
v = <0,1,7>
Find u ✕ v.
Determine if u ✕ v is orthogonal to both u and v by finding the values below.
u · (u ✕ v)  =
v · (u ✕ v)  =

u × v is not orthogonal to both u and v.

u × v is orthogonal to both u and v.    

6.Find u × v and show that it is orthogonal to both u and v.

u = <-1,0,7>

v = <8,-4,0>
 
7.Find a unit vector that is orthogonal to both u and v.
 
u=<-8,-6,4>
v=<15,-18,-1>
 
8.Find the area of the triangle with the given vertices. 
(Hint: (1/2)||u ✕ v||
 is the area of the triangle having u and v as adjacent 
sides.)
A(0, 0, 0), B(4, 0, 6), C(−2, 1, 0)
 
9.The brakes on a bicycle are applied using a downward force of F = 24 pounds on the pedal when the crank makes a 40° angle with the horizontal (see figure). The crank is 6 inches in length. Find the torque at P. (Round your answer to two decimal places.)
 
10.Find u · (v × w).
u  =  i
v  =  j
w  =  k

11. Find u · (v × w).

u = 
<3, 0, 0>

v = 
<10, 10, 10>

w = 
<0, 3, 3>
 
12.Find the determinant of the matrix, if it exists.
-5 0
2 -9

13.Find the determinant of the matrix.

1 3 0
0 -2 1
0 3 -3

Determine whether the matrix has an inverse, but don't calculate the inverse.

The matrix has an inverse.
The matrix does not have an inverse.  
 
14. Find the magnitude and direction (in degrees) of the vector, assuming 0 ≤ θ < 360. (Round the direction to two decimal places.)
v = 
<6, 8>
|?| =
θ= °
 
15. Find the magnitude and direction (in degrees) of the vector, assuming 0 ≤ θ < 360. (Round the direction to two decimal places.)
? = 
<−8, 15>
|?| =

θ= °

16. Find the cross product of the unit vectors. Sketch the result.

k × i

17. Determine whether each point lies on the line.
x = −3 + t,  y = 3t,  z = 4 + t
(a)    
(0, 9, 7)
Yes/No    
(b)   
(3, 4, 7)
Yes/No    
(c)   
(−5, −6, 2)
Yes/No    
 
18. Find sets of parametric equations and symmetric equations of the line that passes through the given point and is parallel to the given vector or line. (For each line, write the direction numbers as integers.)
Point      Parallel to
(0, 0, 0)
 
v = 
 
<8, 1, 4>
 
(a) parametric equations (Enter your answers as a comma-separated list.)
(b) symmetric equations
8x = y = 4z
4x = y = 8z
x/8=y=z/4
x/4=y=z/8
 
19. Find sets of parametric equations and symmetric equations of the line that passes through the given point and is parallel to the given vector or line. (For each line, write the direction numbers as integers.)
Point      Parallel to
(−3, 0, 3)
 
v = 8i + 4j − 6k
(a) parametric equations (Enter your answers as a comma-separated list.)
 
(b) symmetric equations
x/8=y=z/6
(x+3/8)=y/4=(3-z/6)
8x=y/4=6z
(x-3/8)=y=z/6
 
20.Find sets of parametric equations and symmetric equations of the line that passes through the two points (if possible). (For each line, write the direction numbers as integers.)
(0, 0, 16), (12, 12, 0)
(a) parametric equations (Enter your answer as a comma-separated list of equations in terms of xyz, and t.)
 
(b) symmetric equations
12x = 12y = 16z − 4
3x = 3y = 4z − 16
x/12=y/12=(z-4/16)
x/3=y/3=(z-16/-4)
(x-4/12)=(y-4/12)=(z-4/16)
 
21.Find a set of parametric equations of the line with the given characteristics. (Enter your answers as a comma-separated list.)
The line passes through the point
(5, 6, 7)
 and is parallel to the xz-plane and the yz-plane.
 
22. Find the coordinates of the point P on the line and a vector v parallel to the line.
x = 7ty = 8 − tz = 3 + 2t
P(x, y, z) = (                )

v
 = 
 
23. Find the coordinates of a point P on the line and a vector v parallel to the line.
(x-3/9)=(y+6/4)=z+7
 
P(x,y,z)=
v=
 
24. Determine whether the lines are parallel or identical.
x = 6 − 3t,    y = −4 + 4t,    z = 5 + 8t

x = 6t,    y = 4 − 8t,    z = 21 − 16t
 
25. Determine whether the lines intersect, and if so, find the point of intersection and the cosine of the angle of intersection.
 
x/3=(y-2/-1)=z+1, (x-1/4)=y+2=(z+3/-3)
 
26. Find an equation of the plane that passes through the given point and is perpendicular to the given vector or line.
Point      Perpendicular to
(4, 5, −9)
 
n = j

27. Find an equation of the plane that passes through the given point and is perpendicular to the given vector or line.

Point is (8,2,2)
Perpendicular to (x-1/4)=y+2=(z+8/-8)
 
28. Find an equation of the plane that passes through the point (8, -6, 4) and contains the line given by the following equation.
 
x/2=(y-4/-1)=z
 
29. Determine whether the planes are parallel, orthogonal, or neither.
4x − 2y + z = 4
x + 6y + 8z = 1
 
Find the angle between the planes. 
 
30. Determine whether the planes are parallel, orthogonal, or neither.
2x − 10y − 2z = 6
3x − 15y − 3z = −5
 
Find the angle between the planes. 
 
 
 
 
 




6 in.
F
40°
P
Transcribed Image Text:6 in. F 40° P
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