Chapter 12: Problem 4
Pregnant women often assume a posture with their shoulders held far back from their normal position. Why?
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Chapter 12: Problem 4
Pregnant women often assume a posture with their shoulders held far back from their normal position. Why?
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A 160 -kg highway sign of uniform density is \(2.3 \mathrm{m}\) wide and 1.4 \(\mathrm{m}\) high. At one side it's secured to a pole with a single bolt, mounted a distance \(d\) from the top of the sign. The only other place where the sign contacts the pole is at its bottom corner. If the bolt can sustain a horizontal tension of \(2.1 \mathrm{kN},\) what's the maximum permissible value for the distance \(d ?\)
Give an example of an object on which the net force is zero, but that isn't in static equilibrium.
The potential energy as a function of position for a particle is given by $$U(x)=U_{0}\left(\frac{x^{3}}{x_{0}^{3}}+a \frac{x^{2}}{x_{0}^{2}}+4 \frac{x}{x_{0}}\right)$$ where \(x_{0}\) and \(a\) are constants. For what values of \(a\) will there be two static equilibria? Comment on the stability of these equilibria.
A uniform \(5.0-\mathrm{kg}\) ladder is leaning against a frictionless vertical wall, with which it makes a \(15^{\circ}\) angle. The coefficient of friction between ladder and ground is \(0.26 .\) Can a \(65-\mathrm{kg}\) person climb to the top of the ladder without it slipping? If not, how high can that person climb? If so, how massive a person would make the ladder slip?
A 2.0 -m-long rod has density \(\lambda\) in kilograms per meter of length described by \(\lambda=a+b x,\) where \(a=1.0 \mathrm{kg} / \mathrm{m}, b=1.0 \mathrm{kg} / \mathrm{m}^{2}\) and \(x\) is the distance from the left end of the rod. The rod rests horizontally with each end supported by a scale. What do the two scales read?
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