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Chapter 10: Q19P (page 260)

(II) How high would the atmosphere extend if it were of uniform density throughout, equal to half the present density at sea level?

Short Answer

Expert verified

The height of the atmosphere is double the present height.

Step by step solution

01

Concepts of fluid pressure

In this problem, for calculating the extent of the atmosphere the relation of fluid pressure is used.

02

Calculation of height

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Most popular questions from this chapter

A drinking fountain shoots water about 12 cm up in the air from a nozzle of diameter 0.60 cm (Fig. 10鈥�57). The pump at the base of the unit (1.1 m below the nozzle) pushes water into a 1.2-cm-diameter supply pipe that goes up to the nozzle. What gauge pressure does the pump have to provide? Ignore the viscosity; your answer will therefore be an underestimate.

A rowboat floats in a swimming pool, and the level of the water at the edge of the pool is marked. Consider the following situations. (i) The boat is removed from the water. (ii) The boat in the water holds an iron anchor which is removed from the boat and placed on the shore. For each situation, the level of the water will,

(a) Rise.

(b) Fall.

(c) Stay the same.

(II) The surface tension of a liquid can be determined by measuring the force \(F\) needed to just lift a circular platinum ring of radius \(r\) from the surface of the liquid. (a) Find a formula for \(\gamma \) in terms of \(F\) and \(r\). (b) At \(30^\circ C\), if \(F = 6.20 \times {10^{ - 3}}\;{\rm{N}}\) and \(r = 2.9\;{\rm{cm}}\), calculate \(\gamma \) for the tested liquid.

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When blood pressure is measured, why must the arm cuff be held at the level of the heart?
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