9.18 | In Figure 9.20, the cg of the pole held by the pole vaulter is 2.00 m from the left hand, and
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9.19 | What is the mechanical advantage of a nail puller — similar to the one shown in Figure 9.22
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9.17 | To get up on the roof, a person (mass 70.0 kg) places a 6.00-m aluminum ladder (mass 10.0 kg)
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9.28 | The upper leg muscle (quadriceps) exerts a force of 1250 N, which is carried by a tendon over
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9.10 | A 17.0-m-high and 11.0-m-long wall under construction and its bracing are shown in Figure
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9.14 | A sandwich board advertising sign is constructed as shown in Figure 9.34. The sign’s mass is
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