A hiker is carrying a backpack in an upright posture, which its strips create a 15 kilogram force on hiker’s both shoulders with a 20o angle with torso. Calculate the momentum and force on his/her lower back.

Human Factors/Ergonomics (SFTY 460)
Homework 11
A hiker is carrying a backpack in an upright posture, which its strips create a 15 kilogram force on hiker’s both shoulders with a 20o angle with torso. Calculate the momentum and force on his/her lower back. Assuming that:

– the length of the torso is 55 cm
– the hiker’s weight is 75 kg
– the weight of upper body is about 68% of entire body weight
– the center of gravity for upper body is about 25 cm above the lower back

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