Answer
$120\ lb$
Work Step by Step
The lever principle states that:
$$F_1d_1=F_2d_2.$$
We plug in the given values to get:
$$
40\times 9=x\times 3\Longrightarrow x=\frac{40\times 9}{3}=120\ lb
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 7 - Section 7.4 - Inverse Variation - Exercises - Page 288: 35
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