P A person’s arm is held with the upper arm vertical, the lower arm and hand horizontal. (a) Find the center of massof the arm in this configuration, given the following data: The upper arm has a mass of 2.5 kg and a center of mass 0.18 mabove the elbow; the lower arm has a mass of 1.6 kg and a center of mass 0.12 m to the right of the elbow; the hand has amass of 0.64 kg and a center of mass 0.40 m to the right of the elbow. (b) A 0.14-kg baseball is placed on the palm of thehand. If the radius of the ball is 3.7 cm, find the center of mass of the arm–ball system.
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.
P A person’s arm is held with the upper arm vertical, the lower arm and hand horizontal. (a) Find the center of mass
of the arm in this configuration, given the following data: The upper arm has a mass of 2.5 kg and a center of mass 0.18 m
above the elbow; the lower arm has a mass of 1.6 kg and a center of mass 0.12 m to the right of the elbow; the hand has a
mass of 0.64 kg and a center of mass 0.40 m to the right of the elbow. (b) A 0.14-kg baseball is placed on the palm of the
hand. If the radius of the ball is 3.7 cm, find the center of mass of the arm–ball system.
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