This figure shows a person preparing to do a pushup. Calculate the back extensor force (Fm) required to keep the trunk in the static position as shown. Report Fm, in units of N, to 0 decimal points (e.g. 101 N). Report only positive values (i.e. the absolute value). You are allowed an error margin of +/- 10 N from the exact correct answer. The spine and back extensor muscle (Fm) are aligned horizontally with the floor. The ground reaction force (GRF) under the hand is aligned vertically. You only need to consider the weight of the trunk (disregard the head and arms). Here is information you may need to solve this problem: • The GRF is 195 N. • The GRF has a moment arm of 0.4 m relative to the vertebra axis of rotation. • The weight of the trunk is 303 N. • Wtrunk has a moment arm of 0.29 m relative to the vertebra axis of rotation. ● Fm has a moment arm of 0.06 m relative to the vertebra axis of rotation.

This figure shows a person preparing to do a pushup. Calculate the back extensor force (Fm) required to keep the trunk in the static position as shown. Report Fm, in units of N, to 0 decimal points (e.g. 101 N). Report only positive values (i.e. the absolute value). You are allowed an error margin of +/- 10 N from the exact correct answer. The spine and back extensor muscle (Fm) are aligned horizontally with the floor. The ground reaction force (GRF) under the hand is aligned vertically. You only need to consider the weight of the trunk (disregard the head and arms). Here is information you may need to solve this problem: • The GRF is 195 N. • The GRF has a moment arm of 0.4 m relative to the vertebra axis of rotation. • The weight of the trunk is 303 N. • Wtrunk has a moment arm of 0.29 m relative to the vertebra axis of rotation. ● Fm has a moment arm of 0.06 m relative to the vertebra axis of rotation.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

Question

This figure shows a person preparing to do a pushup.
Calculate the back extensor force (Fm) required to keep the trunk in the
static position as shown. Report Fm, in units of N, to 0 decimal points
(e.g. 101 N). Report only positive values (i.e. the absolute value). You are
allowed an error margin of +/- 10 N from the exact correct answer.
The spine and back extensor muscle (Fm) are aligned horizontally with
the floor. The ground reaction force (GRF) under the hand is aligned
vertically. You only need to consider the weight of the trunk (disregard
the head and arms).
Here is information you may need to solve this problem:
• The GRF is 195 N.
• The GRF has a moment arm of 0.4 m relative to the vertebra axis of
rotation.
• The weight of the trunk is 303 N.
• W trunk has a moment arm of 0.29 m relative to the vertebra axis of
rotation.
• Fm has a moment arm of 0.06 m relative to the vertebra axis of
rotation.

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