Chapter 9: Q9-9Q (page 230)
Why do you tend to lean backward when carrying a heavy load in your arms?
You lean backward to keep the center of mass over your feet.
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(II) A uniform steel beam has a mass of 940 kg. On it is resting half of an identical beam, as shown in Fig. 9–60. What is the vertical support force at each end?
A uniform meter stick supported at the 25-cm mark is in equilibrium when a 1-kg rock is suspended at the 0-cm end (as shown in Fig. 9–37). Is the mass of the meter stick greater than, equal to, or less than the mass of the rock? Explain your reasoning.
(I) The femur in the human leg has a minimum effective cross-section of about \({\bf{3}}{\bf{.0}}\;{\bf{c}}{{\bf{m}}^{\bf{2}}}\left( {{\bf{ = 3}}{\bf{.0 \times 1}}{{\bf{0}}^{{\bf{ - 4}}}}\;{{\bf{m}}^{\bf{2}}}} \right)\). How much compressive force can it withstand before breaking?
(II) How much pressure is needed to compress the volume of an iron block by 0.10%? Express your answer in \({\bf{N/}}{{\bf{m}}^{\bf{2}}}\), and compare it to atmospheric pressure \(\left( {{\bf{1}}{\bf{.0 \times 1}}{{\bf{0}}^{\bf{5}}}\;{\bf{N/}}{{\bf{m}}^{\bf{2}}}} \right)\).
\(4194.8\;{\rm{kg}}\)
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