(a) Calculate the force exerted by the muscle and the compression force on the fifth lumbar vertebra in Fig. 1.16. Use the information provided in the text. 

(b) Repeat the calculations in (a) for the case when the person shown in Fig. 1.16 holds a 20 kg weight is in his hand.

W1= 320N

W2=160N

 

 

Transcribed Image Text:

1.9 Standing Tip-Toe on One Foot 17 Fr B Erector spinalis muscle Pivot point A 12 PgC W, 30 30° (a) (b) FIGURE 1.16 (a) The bent back. (b) Lever representation. 1.9 Standing Tip-Toe on One Foot 17 Fr B Erector spinalis muscle Pivot point A 12 PgC W, 30 30° (a) (b) FIGURE 1.16 (a) The bent back. (b) Lever representation.