9.28 | The upper leg muscle (quadriceps) exerts a force of 1250 N, which is carried by a tendon over
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9.29 | A device for exercising the upper leg muscle is shown in Figure 9.38, together with a
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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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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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What is a Force & Types of Forces in Physics? - Gravity, Normal Force, Contact Forces - [1-5-1]
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9.15 | What minimum coefficient of friction is needed between the legs and the ground to keep the
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4.42 | A 76.0-kg person is being pulled away from a burning building as shown in Figure 4.40.
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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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10.8 | During a very quick stop, a car decelerates at 7.00 m/s2. (a) What is the angular
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9.30 | A person working at a drafting board may hold her head as shown in Figure 9.39, requiring
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