11.6 Gauge Pressure, Absolute Pressure, and Pressure Measurement

Readings taken relative to the atmosphere against true absolute values, and how manometers, aneroid gauges, and barometers register them.

College Physics 2e, 11.6 Gauge Pressure, Absolute Pressure, and Pressure Measurement

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4 exercises

11.6 Exercise 4

Find the gauge and absolute pressures in the balloon and peanut jar shown in the figure, assuming the manometer connected to the balloon uses water whereas the manometer connected to the jar contains mercury. Express in units of centimeters of water for the balloon and millimeters of mercury for the jar, taking $h = 0 . \text{0500 m}$ for each.

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11.6 Exercise 6

How tall must a water-filled manometer be to measure blood pressures as high as 300 mm Hg?

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11.6 Exercise 8

Suppose you measure a standing person’s blood pressure by placing the cuff on his leg 0.500 m below the heart. Calculate the pressure you would observe (in units of mm Hg) if the pressure at the heart were 120 over 80 mm Hg. Assume that there is no loss of pressure due to resistance in the circulatory system (a reasonable assumption, since major arteries are large).

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11.6 Exercise 10

Assuming bicycle tires are perfectly flexible and support the weight of bicycle and rider by pressure alone, calculate the total area of the tires in contact with the ground. The bicycle plus rider has a mass of 80.0 kg, and the gauge pressure in the tires is $3 . \text{50} \times \text{10}^{5} \text{Pa}$ .

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