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(c) The magnitude of
G
r
is
22
 
(1.59 m)
(12.1 m)
12.2 m.
rr
==
+
=
G
(d) The angle between
G
r
and the +
x
direction is tan
–1
[(12.1 m)/(1.59 m)] = 82.5°.
17. It should be mentioned that an efficient way to work this vector addition problem is
with the cosine law for general triangles (and since
G
G
ab
, and
G
r
form an isosceles triangle,
the angles are easy to figure).
However, in the interest of reinforcing the usual
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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, Work

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