$(30$ pts $)$ Poor posture can lead to increase demands on our musculoskeletal system. Compare

the two static positions of the cervical spine in an O&P student who is: A$)$ listening to a long

lecture $($neutral spine and smiling face$),$ versus B$)$ typing on the computer $($cervical flexion$).$

Recall: The equation to calculate a moment $(M)$ is:

$M=Fd$

where M is the moment, F is the force that causes the moment, and d is the perpendicular

distance between the force and the pivot point.

a$)$ Calculate the muscle force $($in Newtons$)$ required $(F_1)$ to maintain the head position in