   Chapter 4, Problem 38P

Chapter
Section
Textbook Problem

A certain orthodontist uses a wire brace to align a patient’s crooked tooth as in Figure P4.88. The tension in the wire is adjusted to have a magnitude of 18.0 N. Find the magnitude of the net force exerted by the wire on the crooked tooth. Figure P4.38

To determine
The magnitude of the net force exerted by the wire on the tooth.

Explanation

Given info: The tension on the wire is 18.0 N.

The horizontal cosine components of tension cancel each other because they are equal in magnitude and opposite in direction. The vertical sine components get added. The free body diagram is given below.

In the diagram, T is the tension on the wire.

The magnitude of the net force is,

Fnet=2Tsin14ο

Substitute 18

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