aggrawalakanksha98 aggrawalakanksha98

16-12-2022
Physics

Answered

A person is holding the box vertically (the box is NOT put on the table). Calculate the muscle force required to maintain the posture shown in the picture (consider only the force at L5/S1). Show all work to receive any partial credit.
Potentially Useful Information:

Mass box, forearm, and hands = 15kg
Mass torso and head = 40 kg
Angular velocity = 2 rad/sec
Angular Acceleration = 8 rad/sec2
Moment arm of erector spinae =6cm
Distance from L5/S1 to CoM of Torso = 25cm
Distance from L5/S1 to Shoulder joint =55cm

Answer :

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