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Chapter 10: Q31P (page 260)
The specific gravity of ice is 0.917, whereas that of seawater is 1.025. What percent of an iceberg is above the surface of the water?
The percent of an iceberg above the surface of the water is \(10.5\% \).
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(I) Estimate the pressure exerted on a floor by (a) a one-pointed heel of area = 0.45 cm2, and (b) one wide heel of area 16 cm2, Fig. 10鈥�48. The person wearing the shoes has a mass of 56 kg.
An ice cube floats in a glass of water filled to the brim. What can you say about the density of ice? As the ice melts, will the water overflow? Explain
(I) The approximate volume of the granite monolith known as El Capitan in Yosemite National Park (Fig.10鈥�47) is about 108M3. What is its approximate mass?
(I) If the force \(F\) needed to move the wire in Fig. 10鈥�34 is \(3.4 \times {10^{ - 3}}\;{\rm{N}}\), calculate the surface tension \(\gamma \) of the enclosed fluid. Assume \(l = 0.070\;m\).
(a) Show that the flow speed measured by a venturi meter (see Fig. 10-29) is given by the relation
\({{\bf{v}}_{\bf{1}}}{\bf{ = }}{{\bf{A}}_{\bf{2}}}\sqrt {\frac{{{\bf{2}}\left( {{{\bf{P}}_{\bf{1}}}{\bf{ - }}{{\bf{P}}_{\bf{2}}}} \right)}}{{{\bf{\rho }}\left( {{\bf{A}}_{\bf{1}}^{\bf{2}}{\bf{ - A}}_{\bf{2}}^{\bf{2}}} \right)}}} \).
(b) A venturi meter is measuring the flow of water; it has a main diameter of \({\bf{3}}{\bf{.5\;cm}}\) tapering down to a throat diameter of \({\bf{1}}{\bf{.0\;cm}}\). If the pressure difference is measured to be \({\bf{18\;mm - Hg}}\), what is the speed of the water entering the venturi throat?
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