Chapter 8, Problem 6P

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# A dental bracket exerts a horizontal force of 80.0 N on a tooth at point B in Figure P8.6. What is the torque on the root of the tooth about point A?

To determine
The torque on the root of the tooth about point A .

Explanation
For torque on the beam about the point A , the perpendicular component of force on the beam is multiplied with their corresponding location.

Given info: The length of the root of the teeth is 1.20â€‰cm , the force on the root is 80.0â€‰N , and the orientation of the root from vertical line is 48.0Â° .

The formula for the net torque on the beam is,

Ï„=rFcosÎ¸

• r is length of the root.
• F is the force on the tooth due to dental bracket.
• b is length of the beam.
• Î¸ is the angle of the force.

Substitute 80.0â€‰N for F , 48.0Â° for Î¸ , and 1.20â€‰cm for r to find Ï„

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