The Position of the Center of Mass of a System

question 36

Multiple Choice

The position of the center of mass of a system of particles moves as x = 4.5 t + 2.4 t² + 1.1 t³, where x is in meters.If the system starts from rest at t = 0, what is its velocity at t = 3.0 s?

• A)8.0 m/s
• B)21 m/s
• C)49 m/s
• D)64 m/s
• E)65 m/s

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Definitions:

Depolarization

A reversal in the electrical potential across a cell's plasma membrane, leading to the initiation of an action potential or nerve impulse.

Sodium Ions

Positively charged atoms of sodium, crucial for maintaining fluid balance and transmitting nerve impulses in the body.

Potassium Ions

Electrolytes with a positive charge found inside and outside of cells, essential for maintaining normal cell function including nerve impulse transmission and muscle contraction.

Excitation-Contraction Coupling

Stimulation of a muscle fiber produces an action potential that results in contraction of the muscle fiber.