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Physics / Physics with MasteringPhysics 4 / Chapter 15 / Problem 85GP

Physics with MasteringPhysics | 4th Edition | ISBN: 9780321541635 | Authors: James S. Walker

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Chapter 15, Problem 85GP

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QUESTION:

Measuring Pain Threshold A useful instrument for evaluating fibromyalgia and trigger-point tenderness is the doloriometer or algorimeter. This device consists of a force meter attached to a circular probe that is pressed against the skin until pain is experienced. If the reading of the force meter is \(3.25 \mathrm{lb}\), and the diameter of the circular probe is \(1.39 \mathrm{~cm}\), what is the pressure applied to the skin? Give your answer in pascals.

Equation Transcription:

$3.25\ lb$

$1.39\ cm$

Text Transcription:

3.25 lb

1.39 cm

Questions & Answers

QUESTION:

Measuring Pain Threshold A useful instrument for evaluating fibromyalgia and trigger-point tenderness is the doloriometer or algorimeter. This device consists of a force meter attached to a circular probe that is pressed against the skin until pain is experienced. If the reading of the force meter is \(3.25 \mathrm{lb}\), and the diameter of the circular probe is \(1.39 \mathrm{~cm}\), what is the pressure applied to the skin? Give your answer in pascals.

Equation Transcription:

$3.25\ lb$

$1.39\ cm$

Text Transcription:

3.25 lb

1.39 cm

ANSWER:

Solution 85GP

Step 1 of 3

Here we need to calculate the pressure applied to the skin when a force of $F=3.25\ lb$ is applied on skin and the diameter of the probe is given to be $d=1.39\ cm$ .

Given data

Diameter, $d=1.39\ cm=0.0139\ m$
Force, $F=3.25\ lb$

Using $1\ N=0.225\ lb$ $F=3.25\ lb\left|{\frac{1\ N}{0.225\ lb}}\right|$

$F=14.44\ N$

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