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Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 9 - Problem 32p
Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 9 - Problem 32p

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# (II) (a) Calculate the magnitude of the force, FM required

ISBN: 9780130606204 3

## Solution for problem 32P Chapter 9

Physics: Principles with Applications | 6th Edition

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Problem 32P

(II) (a) Calculate the force, $$F_{M}$$, required of the "deltoid" muscle to hold up the outstretched arm shown in Fig. . The total mass of the arm is . (b) Calculate the magnitude of the force $$F_{J}$$ exerted by the shoulder joint on the upper arm.

Equation Transcription:

Text Transcription:

F_{M}

F_{J}

Step-by-Step Solution:

Step-by-step solution

Step 1 of 5 ^

We are going to draw the free body diagram of the system

Shoulder joint is taken as pivot point O

Fm; The force exerted by muscle.

W: the weight of the arm/

Fj; the reaction force exerted from the joint.

dfm; the force  distance from muscle force to pivot pint

dw; the force distance from weight of the arm to pivot point.

Step 1 of 5 ^

We are going write the second condition of equilibrium as taking  the torques around pivot point to find the force exerted by muscle.

The force exerted by muscle to hold the arm.

Step 2 of 5

Step 3 of 5

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(II) (a) Calculate the magnitude of the force, FM required