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9 ) A 170 kg crate hangs from the end of
affope of length L = 12.0 m. You push
人
horizontally on the crate with a varying
force É to move it distance d = 3.50 m to
L
the side (Fig. 7-20). (a) What is the mag-
nitude of † when the crate is in this final
position? During the crate's displace-lid 250 bisw
ment, what are (b) the total work done
32
on it, (c) the work done by the grav-
16 Hoold
itational force on the crate, and (d) the
kd
work done by the pull on the crate from
the rope? (e) Knowing that the crate is Figure 7-20 Problem 9.
motionless before and after its displace-
ment, use the answers to (b), (c), and (d) to find the work
force + does on the crate. (f) Why is the work of your force not
. (
equal to the product of the horizontal displacement and the answer
to (a)?
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your