/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Q 35PE Question: Unlike most of the oth... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 9: Q 35PE (page 319)

Question: Unlike most of the other muscles in our bodies, the masseter muscle in the jaw, as illustrated inFigure 9.44, is attached relatively far from the joint, enabling large forces to be exerted by the back teeth. (a) Using the information in the figure, calculate the force exerted by the lower teeth on the bullet. (b) Calculate the force on the joint.

Short Answer

Expert verified

(a) The total force exerted by the lower teeth is 116N.

(b) The force on the joint is 84N.

Step by step solution

01

Define the force

A force is an external factor that can change the rest or motion of a body. It has a size and a general direction.

02

Free-body diagram

The diagram for the leg muscles is shown below:

The net upward force is Fm, Freaction is the force exerted on the bullet by the lower teeth andFJ is the force on the joint.

03

Calculation of the force due to the lower teeth

(a)

Applying the equilibrium under the torque, we get,

FM脳2.90=Freaction脳5Freaction=FM脳2.905=200N脳2.905=116N

Hence, the force is 116N.

04

Calculation of the force on the joint

(b)

Applying the condition of equilibrium under forces, we get,

FJ=FM+Freaction=200-116=84N

Hence, the force is 84N.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Suppose a horse leans against a wall, as in Figure 9.31. Calculate the force exerted on the wall assuming that force is horizontal while using the data in the schematic representation of the situation. Note that the force exerted on the wall is equal in magnitude and opposite in direction to the force exerted on the horse, keeping it in equilibrium. The total mass of the horse and rider is . Take the data to be accurate to three digits.

What minimum coefficient of friction is needed between the legs and the ground to keep the sign inFigure 9.35in the position shown if the chain breaks? (b) What force is exerted by each side on the hinge?

Question: A \({\rm{75}}\;{\rm{kg}}\) man stands on his toes by exerting an upward force through the Achilles tendon, as inFigure. (a) What is the force in the Achilles tendon if he stands on one foot? (b) Calculate the force at the pivot of the simplified lever system shown鈥攖hat force is representative of forces in the ankle joint.

To get up on the roof, a person (mass \(70.0\;{\rm{kg}}\)) places a \(6.00\;{\rm{m}}\)aluminum ladder (mass \(10.0\;{\rm{kg}}\)) against the house on a concrete pad with the base of the ladder \(2.00\;{\rm{m}}\)from the house. The ladder rests against a plastic rain gutter, which we can assume to be frictionless. The center of mass of the ladder is \(2\;{\rm{m}}\)from the bottom. The person is standing \(3\;{\rm{m}}\) from the bottom. What are the magnitudes of the forces on the ladder at the top and bottom?

Repeat the seesaw problem in Example 9.1 with the center of mass of the seesaw \({\rm{0}}{\rm{.160}}\;{\rm{m}}\) to the left of the pivot (on the side of the lighter child) and assuming a mass of \({\rm{12}}{\rm{.0}}\;{\rm{kg}}\) for the seesaw. The other data given in the example remain unchanged. Explicitly show how you follow the steps in the Problem-Solving Strategy for static equilibrium
See all solutions

Recommended explanations on Physics Textbooks

Further Mechanics and Thermal Physics

Read Explanation

Linear Momentum

Read Explanation

Atoms and Radioactivity

Read Explanation

Famous Physicists

Read Explanation

Conservation of Energy and Momentum

Read Explanation

Electromagnetism

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.