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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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How do gases differ from liquids?
Marbles dropped into a partially filled bathtub sink to the bottom. Part of their weight is supported by buoyant force, yet the downward force on the bottom of the tub increases by exactly the weight of the marbles. Explain why.
The greatest ocean depths on the Earth are found in the Marianas Trench near the Philippines. Calculate the pressure due to the ocean at the bottom of this trench, given its depth isand assuming the density of seawater is constant all the way down.
Considering the magnitude of typical arterial blood pressures, why are mercury rather than water manometers used for these measurements?
Figure 11.7shows how a common measurement of arterial blood pressure is made. Is there any effect on the measured pressure if the manometer is lowered? What is the effect of raising the arm above the shoulder? What is the effect of placing the cuff on the upper leg with the person standing? Explain your answers in terms of pressure created by the weight of a fluid.
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