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ˆˆ
ˆ
= [( 755 m)
(276 m)]i +(231 m
231 m) j
(1031 m) i.
r
Δ−
−
−
=
−
G
The magnitude of the displacement
r
Δ
G
is 
 1031 m.
r
Δ=
G
(b) The direction of
r
Δ
G
is
ˆ
i
−
, or westward.
90. We use a coordinate system with +
x
eastward and +
y
upward.
(a) We note that 123° is the angle between the initial position and later position vectors,
so that the angle from +
x
to the later position vector is 40° + 123° = 163°. In unitvector
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics

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