lim (kl9356) – Homework 8 – Weathers – (17104)
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11
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001
(part 1 of 2) 10.0 points
A force
vector
F
=
F
x
ˆ
ı
+
F
y
ˆ
acts on a particle that
undergoes a displacement of
vectors
=
s
x
ˆ
ı
+
s
y
ˆ
.
Let:
F
x
= 9 N,
F
y
=

5 N,
s
x
= 6 m, and
s
y
= 2 m.
Find the work done by the force on the
particle. Answer in units of J.
002
(part 2 of 2) 10.0 points
Find the angle between
vector
F
and
vectors
. Answer in
units of
◦
.
003
10.0 points
A shopper in a supermarket pushes a cart
with a force of 35
.
6 N directed at an angle of
23
.
4
◦
downward from the horizontal.
Find the work done by the shopper as she
moves down a 51
.
6 m length of aisle. Answer
in units of kJ.
004
10.0 points
Hint:
W
=
vector
S
·
vector
F .
Consider a force
vector
F
with components
F
x
=
31 N,
F
y
= 40 N, and
F
z
= 73 N, as illustrated
in the figure below.
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 Fall '08
 Weathers
 Magnetism, Energy, Force, Potential Energy, Work, lim

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