A person bends forward to hold a dumbbell of 10.0-kg. The spine and upper body are pivoted at the base of the spine, and represented as a uniform horizontal rod of 25.0-kg with center of mass is 0.21m away from the pivot. The horizontal distance from the dumbbell to the pivot is 0.42m. The spinalis muscle, attached at a point 0.28 m away from the pivot, exerts a tension force 15° above the horizontal spine and maintains the position of the back. a) Determine the magnitude of torque exerted by the weight of the upper body; b) Determine the magnitude of the torque exerted by the dumbbell; c) Determine the magnitude of the torque exerted by the spinalis muscle; d) Determine the magnitude of the tension force exerted by the spinalis muscle. Tmuscle

A person bends forward to hold a dumbbell of 10.0-kg. The spine and upper body are pivoted at the base of the spine, and represented as a uniform horizontal rod of 25.0-kg with center of mass is 0.21m away from the pivot. The horizontal distance from the dumbbell to the pivot is 0.42m. The spinalis muscle, attached at a point 0.28 m away from the pivot, exerts a tension force 15° above the horizontal spine and maintains the position of the back. a) Determine the magnitude of torque exerted by the weight of the upper body; b) Determine the magnitude of the torque exerted by the dumbbell; c) Determine the magnitude of the torque exerted by the spinalis muscle; d) Determine the magnitude of the tension force exerted by the spinalis muscle. Tmuscle

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

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

A person bends forward to hold a dumbbell of 10.0-kg. The spine and upper
body are pivoted at the base of the spine, and represented as a uniform
horizontal rod of 25.0-kg with center of mass is 0.21m away from the pivot.
The horizontal distance from the dumbbell to the pivot is 0.42m. The spinalis
muscle, attached at a point 0.28 m away from the pivot, exerts a tension force
15° above the horizontal spine and maintains the position of the back.
a)
Determine the magnitude of torque exerted by the weight of the upper
body;
c)
b) Determine the magnitude of the torque exerted by the dumbbell;
Determine the magnitude of the torque exerted by the spinalis muscle;
Determine the magnitude of the tension force exerted by the spinalis
muscle.
d)
F1
2
A-
F2
#3
F3
X
F4
$
4
F5
%
5
+
F6
CC
29
F7
&
N
F8
*C
F9
Tmuscle
Pivot
F10
15
Center of mass
)
F11
E
F12
Insert
+
Prisc

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