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Chapter 11: Q2CQ (page 394)
Which of the following substances are fluids at room temperature: air, mercury, water, glass?
Fluids are substances which undergoes continuous deformation when subjected to a shearing force.
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Suppose you have a coffee mug with a circular cross section and vertical sides (uniform radius). What is its inside radius if it holds of coffee when filled to a depth of? Assume coffee has the same density as water.
Why is force exerted by static fluids always perpendicular to a surface?
Calculate the average pressure exerted on the palm of a shot-putter’s hand by the shot if the area of contact is and he exerts a force ofrole="math" localid="1668682357057" on it. Express the pressure inand compare it with thepressures sometimes encountered in the skeletal system.
The alveoli in emphysema victims are damaged and effectively form larger sacs. Construct a problem in which you calculate the loss of pressure due to surface tension in the alveoli because of their larger average diameters. (Part of the lung’s ability to expel air results from pressure created by surface tension in the alveoli.) Among the things to consider are the normal surface tension of the fluid lining the alveoli, the average alveolar radius in normal individuals and its average in emphysema sufferers.
Why does a dull hypodermic needle hurt more than a sharp one?
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