A woman doing core exercises is in a “plank position,” as shown in the diagram below. The joint where the spine meets the pelvis is the pivot, with the legs on one side and the upper body on the other. It is the abdominal muscles that keep the two segments from bending away from each other. The contact force at her feet is 230.0 N, and the mass of the lower segment of her body is 30.61 kg. What is the tension in her abdominal muscles that keeps her body in static equilibrium? Note: 1. The object is the lower portion of the person’s body. 2. The object interacts with the following things: The Earth exerts a gravitational pull (FG)vertically downwards on this portion of their body. The feet are touching the floor, so there is a normal force (n) there. The abdominals pull (T)towards the right to balance the torques due to the other forces. This presses the pelvis into contact with the lumbar vertebrae.
A woman doing core exercises is in a “plank position,” as shown in the diagram below. The joint
where the spine meets the pelvis is the pivot, with the legs on one side and the upper body on the
other. It is the abdominal muscles that keep the two segments from bending away from each other.
The contact force at her feet is 230.0 N, and the mass of the lower segment of her body is 30.61 kg.
What is the tension in her abdominal muscles that keeps her body in static equilibrium?
Note:
1. The object is the lower portion of the person’s body.
2. The object interacts with the following things: The Earth exerts a gravitational pull (FG)vertically
downwards on this portion of their body. The feet are touching the floor, so there is a normal force
(n) there. The abdominals pull (T)towards the right to balance the torques due to the other forces.
This presses the pelvis into contact with the lumbar vertebrae.
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