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  2. String vibration - Wikipedia

    en.wikipedia.org/wiki/String_vibration

    where is the tension (in Newtons), is the linear density (that is, the mass per unit length), and is the length of the vibrating part of the string. Therefore: the shorter the string, the higher the frequency of the fundamental; the higher the tension, the higher the frequency of the fundamental

  3. Mersenne's laws - Wikipedia

    en.wikipedia.org/wiki/Mersenne's_laws

    If the tension on a string is ten lbs., it must be increased to 40 lbs. for a pitch an octave higher. [1] A string, tied at A, is kept in tension by W, a suspended weight, and two bridges, B and the movable bridge C, while D is a freely moving wheel; all allowing one to demonstrate Mersenne's laws regarding tension and length [1]

  4. Violin acoustics - Wikipedia

    en.wikipedia.org/wiki/Violin_acoustics

    For vibrations with a large amplitude, the tension is not constant. [28] Increasing the tension on a string results in a higher frequency note: [12] the frequency of the vibrating string, which is directly proportional to the square root of the tension, [3] can be represented by the following equation:

  5. Tetanic contraction - Wikipedia

    en.wikipedia.org/wiki/Tetanic_contraction

    This occurs when a muscle's motor unit is stimulated by multiple impulses at a sufficiently high frequency. Each stimulus causes a twitch. If stimuli are delivered slowly enough, the tension in the muscle will relax between successive twitches. If stimuli are delivered at high frequency, the twitches will overlap, resulting in tetanic contraction.

  6. Resonance - Wikipedia

    en.wikipedia.org/wiki/Resonance

    Increase of amplitude as damping decreases and frequency approaches resonant frequency of a driven damped simple harmonic oscillator. [1] [2]Resonance is a phenomenon that occurs when an object or system is subjected to an external force or vibration that matches its natural frequency.

  7. 'I'm A Fitness Editor Who's Constantly Testing Resistance ...

    www.aol.com/resistance-bands-fire-muscles-better...

    Resistance Bands Set. This set includes five resistance bands of increasing tension levels and various attachments, so you can use it to add resistance to a full-body workout from anywhere.

  8. Piano tuning - Wikipedia

    en.wikipedia.org/wiki/Piano_tuning

    The tuning lever is used to turn and 'set' the tuning pins, increasing or decreasing the tension of the string. Mutes are used to silence strings that are not being tuned. While tuning the temperament octave, a felt strip is typically placed within the temperament (middle) section of the piano; it is inserted between each note's trichord ...

  9. What’s the history of the Panama Canal, and why is Trump ...

    www.aol.com/news/history-panama-canal-why-trump...

    President-elect Donald Trump over the weekend suggested the US should retake the Panama Canal, an idea that was immediately rejected by the government of Panama, which has controlled the passage ...