The figure depicts a person doing a deadlift. All moment arm lengths are relative to the L5 vertebra. The L5 vertebra is angled at 12 deg (angle ) as indicated. Fmuscle is aligned with the long axis of the vertebra. • The barbell weight is WBB = 874 N. It has a moment arm of 0.37 m. • The arm weight Warms = 55 N. It has a moment arm of 0.34 m. • The trunk weight Wtrunk = 344 N. It has a moment arm of 0.15 m. Fmuscle has a moment arm of 0.05 m. ● Calculate the compressive bone-on-bone force (N). Report positive values to the nearest Newton (e.g. 111 N). You are allowed a 10% margin of error for rounding.

The figure depicts a person doing a deadlift. All moment arm lengths are relative to the L5 vertebra. The L5 vertebra is angled at 12 deg (angle ) as indicated. Fmuscle is aligned with the long axis of the vertebra. • The barbell weight is WBB = 874 N. It has a moment arm of 0.37 m. • The arm weight Warms = 55 N. It has a moment arm of 0.34 m. • The trunk weight Wtrunk = 344 N. It has a moment arm of 0.15 m. Fmuscle has a moment arm of 0.05 m. ● Calculate the compressive bone-on-bone force (N). Report positive values to the nearest Newton (e.g. 111 N). You are allowed a 10% margin of error for rounding.