Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Calculus questions?
1. Show and/or explain that u = v.
2. Find the component form AND the magnitude of the vector v with initial point (1, 11) and terminal point (9, 3).
3. Write your answer as a vector in the form <a, b>.
A. Let u = <7, -3> and v = <-2, 4>. Find 3v.
B. Let u = <7, -3> and v = <-2, 4>. Find -8u.
C. Let u = <7, -3> and v = <-2, 4>. Find u + 3v.
D. Let u = <7, -3> and v = <-2, 4>. Find u - v.
4. Find the direction angle for vector v. If necessary, round your answer to the nearest tenth of a degree.
A. v = 8i - 10j
B. w = -4i - 3j
2 Answers
- PinkgreenLv 72 years ago
(1)
u=(0-(-3))i+(4-(-4))j=3i+8j
v=(3-0)i+(3-(-5))j=3i+8j
=>
u=v
(2)
v=? Do it yourself with reference
to (1)
(3) v=<2,4>; u=<7,-3>
=>
A) 3v=3<2,4>=<6,12>
B) -8u=(-8)<7,-3>=<-56,24>
C) u+3v=<7,-3>+<6,12>=<13,9>
D) u-v=<7,-3>-<2,4>=<5,-7>
(4)
A) v=8i-10j=>
angle=tan^-1(-10/8)=308.7*
B) w=-4i-3j=>
angle=tan^-1(-3/(-4))=216.9*
approximately.
(Measured counterclockwise).
or
A) angle=-51.3* approximately
(Measured clockwise).
- az_lenderLv 72 years ago
#1. Both u and v are -3i - 8j, or <-3, -8>.
#2. Component form is 8i - 8j, or <8, -8>.
Magnitude is 8*sqrt(2).
#3. (A) 3v = <-6, 12>. (B) -8u = <-56, 24>.
(C) u + 3v = <1, 9>. (D) u - v = <9, -7>.
#4. (A) arctan(-10/8) = about 310 degrees but use a calculator.
(B) arctan(-3/-4) = about 215 degrees but use a calculator.
