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Physics / College Physics 1 / Chapter 11 / Problem 30

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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(a) Convert normal blood pressure readings of 120 over 80

Chapter 11, Problem 30

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QUESTION:

Problem 30PE

(a) Convert normal blood pressure readings of 120 over 80 mm Hg to newtons per meter squared using the relationship for pressure due to the weight of a fluid (P = hρg) rather than a conversion factor. (b) Discuss why blood pressures for an infant could be smaller than those for an adult. Specifically, consider the smaller height to which blood must be pumped.

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QUESTION:

Problem 30PE

(a) Convert normal blood pressure readings of 120 over 80 mm Hg to newtons per meter squared using the relationship for pressure due to the weight of a fluid (P = hρg) rather than a conversion factor. (b) Discuss why blood pressures for an infant could be smaller than those for an adult. Specifically, consider the smaller height to which blood must be pumped.

ANSWER:

Solution

Step 1 of 2

We need to convert normal blood pressure readings of 120 over 80 mm Hg to newtons per meter square.

We know the relationship for pressure due to the weight of a fluid,

The density of mercury

Pressure of mercury at height is

Pressure of mercury at height is

So the converted value of blood pressure readings of 120 over 80 mm Hg in to newtons per meter square is over .

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