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Chapter 10: Q19Q (page 260)
Roofs of houses are sometimes 鈥渂lown鈥� off (or are they pushed off?) during a tornado or hurricane. Explain using Bernoulli鈥檚 principle.
The pressure difference inside the room and over the roof tends the roof of the house to blow off.
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(II) A two component model used to determine percent body fat in a human body assumes that a fraction \(f\left( { < 1} \right)\) of the body鈥檚 total mass m is composed of fat with a density of \({\rm{0}}{\rm{.90 g/c}}{{\rm{m}}^3}\), and that the remaining mass of the body is composed of fat-free tissue with a density of \({\rm{1}}{\rm{.10 g/c}}{{\rm{m}}^3}\). If the specific gravity of the entire body鈥檚 density is \({\rm{X}}\), show that the percent body fat \(\left( { = f \times 100} \right)\)is given by
\(\% {\rm{Body fat}} = \frac{{{\rm{495}}}}{X} - 450\).
Blood is placed in a bottle 1.40 m above a 3.8-cm-long needle, of inside diameter 0.40 mm, from which it flows at a rate of \({\bf{4}}{\bf{.1}}\;{\bf{c}}{{\bf{m}}^{\bf{3}}}{\bf{/min}}\). What is the viscosity of this blood?
(II) A \({\rm{0}}{\rm{.48 kg}}\)piece of wood floats in water but is found to sink in alcohol \(\left( {SG = 0.79} \right)\), in which it has an apparent mass of\({\rm{0}}{\rm{.047 kg}}\). What is the SG of the wood
(II)What is the lift (in newtons) due to Bernoulli鈥檚 principle on a wing of area\(88\;{{\rm{m}}^2}\)if the air passes over the top and bottom surfaces at speeds of 280 m/s and 150 m/s, respectively?
A viscometer consists of two concentric cylinders, \({\bf{10}}{\bf{.20}}\;{\bf{cm}}\) and \({\bf{10}}{\bf{.60}}\;{\bf{cm}}\)in diameter. A liquid fills the space between them to a depth of \({\bf{12}}{\bf{.0}}\;{\bf{cm}}\). The outer cylinder is fixed, and a torque of \({\bf{0}}{\bf{.024}}\;{\bf{m}} \cdot {\bf{N}}\) keeps the inner cylinder turning at a steady rotational speed of \({\bf{57}}\;{\bf{rev/min}}\). What is the viscosity of the liquid?
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