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Chapter 1: Q3E (page 124)

bio Jaw Injury.Due to a jaw injury, a patient must wear a strap (Fig. E4.3) that produces a net upward force of 5.00 N on his chin. The tension is the same throughout the strap. To what tension must the strap be adjusted to provide the necessary upward force?

Short Answer

Expert verified

The tension in the strap must be adjusted to3.15N to provide 5.00 N upward forces.

Step by step solution

01

Given data

The straps make an angle 75掳 between them.

02

Vector sum

The magnitude of vector sum of two vectors A鈫� and B鈫� with an angle 胃between them is

R=A2+B2+2ABcos胃.....1

03

Tension in the string

Let the tension in each strap be T . Thus, from equation (1)

5N=T2+T2+2T2cos75掳=2T1+cos75掳=1.59TT=3.15N

Thus, the tension in the strap should be 3.15N.

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