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# S18 PH 121 3 practice 1

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## Richard Datwyler

on 28 September 2018

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#### Transcript of S18 PH 121 3 practice 1

Vectors!!!
Y
X
V
V
V
y
x
The idea is that every vector has
components (parts) that are in the
direction of the x and y axis.
O
V
y
V
y
V
x
V
x
V
V
V
V
Sin =
Tan =
= Sin
= Cos
O
O
O
O
V
x
V
Cos =
O
y
Let vectors
A = (3.0 m, 20 degrees south of east),
B = (2.0 m, north)
C = (5.0 m , 70 degrees south of west)
Write A,B,C in component form, and find D=A+B+C.

3.9 m 73 degrees south of east
Let
find the magnitudes and directions of:
E and F
E + F
-E - 2F

3.6, 56.3 degrees north of east
2.8, 45 degrees south of east
4.1, 14 degrees north of east
6.1, 9.5 degrees north of west
Which of these two are easier? Why.

As we do problems in the future, we will
use these two ideas heavily

Practice, Practice Practice

3. 10,11,12,13,14,15,16,21,23,29

If vector X has magnitude of 5 N and is pointing 30 degrees north of west, What competent of this vector points west? (let east be positive direction)
How much points north?
What are the X and Y components of the vectors:
Ax = 38.8
Ay = 20.7
Bx = -14.8
By = 22.0
Cx = 0
Cy = -31
What is E in component form,
What is its magnitude,
What is its direction?

-i +11j
84.8 SofW
11
Find C such that A+B+C = 0
-4.8 i - 2.4 j
5.4
27 SoW
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