Lecture 4 - Mech. Waves (Ch. 13.1-13.3)

# Lecture 4 - Mech. Waves (Ch. 13.1-13.3) - Lecture 4...

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Lecture 4: mechanical waves

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Sin and Cos are the same… only differ by a phase angle
Discussion Problems Tomorrow o 25 minutes o Given after 10 min question time o Equations provided. F = -k x d/dt [cos(at)] = - a sin (at) d/dt [sin(at)] = a cos(at)

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What is a wave? Pebble into a pond creates a ripple: what moves?
What Is A Wave? o Mechanical Waves: Requirements: A disturbance A medium that can be disturbed A mechanism allowing particles of the medium to influence each other A mechanical wave is a disturbance propagating in a medium o Other Waves: Electromagnetic (Light) Matter Waves (Quantum mechanics) Neither of these require a medium

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Example of Wave in a Medium o The requirements: Your hand provides the “disturbance” The string is the “medium” A piece of the string “influences” neighboring pieces by exerting tension o The pulse has an unchanging shape which travels along the string. The pulse creates a displacement of the string as it travels This displacement is the disturbance
What Travels and What Doesn’t o Point P moves only up and down. o The disturbance can travel a long way through the medium The medium itself moves (is disturbed) but doesn’t travel “with” the wave

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o For Transverse Waves, disturbance is a
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Lecture 4 - Mech. Waves (Ch. 13.1-13.3) - Lecture 4...

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