Deltoid Ахe Shoulder joint Before throwing, I hold the 1.5-pound (0.67-kg) axe out in front of me at arm's length, the axe's center of mass being 75 centimeters from my shoulders. la. What torque does the axe exert about the axis of my shoulder? b. My deltoid is connected to my upper arm 15 cm from the shoulder joint, pulling at an angle 30 degrees from the arm. What force does the deltoid need to exert in order to hold the axe out in front of me? What third force must be exerted by the surrounding shoulder joint, in order to hold my arm out like this? Include a quick picture, showing direction! с.

Deltoid Ахe Shoulder joint Before throwing, I hold the 1.5-pound (0.67-kg) axe out in front of me at arm's length, the axe's center of mass being 75 centimeters from my shoulders. la. What torque does the axe exert about the axis of my shoulder? b. My deltoid is connected to my upper arm 15 cm from the shoulder joint, pulling at an angle 30 degrees from the arm. What force does the deltoid need to exert in order to hold the axe out in front of me? What third force must be exerted by the surrounding shoulder joint, in order to hold my arm out like this? Include a quick picture, showing direction! с.

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.78P: The figure shows a steel bar being processed by a rolling mill. Given that P=80kN and r =0.016,...

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Concept explainers

Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.

Question

Deltoid
Axe
Shoulder joint
Before throwing, I hold the 1.5-pound (0.67-kg) axe out in front of me at arm's length, the
axe's center of mass being 75 centimeters from my shoulders.
What torque does the axe exert about the axis of my shoulder?
b. My deltoid is connected to my upper arm 15 cm from the shoulder joint,
pulling at an angle 30 degrees from the arm.
What force does the deltoid need to exert in order to hold the axe out in front of me?
What third force must be exerted by the surrounding shoulder joint,
in order to hold my arm out like this? Include a quick picture, showing direction!

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