Did you increase or decrease the length of the pendulum’s thread if the frequency
Did you increase or decrease the length of the pendulum’s thread if the frequency of its oscillations was at first equal to 5 Hz, and then decreased to 3 Hz?
Data: νн (initial oscillation frequency of the specified pendulum) = 5 Hz; νk (final vibration frequency) = 3 Hz.
The length of the thread of the specified pendulum was increased, since the frequency is inversely proportional to the length of the thread.
Proof: The change in the length of the thread of the indicated pendulum is determined using the formula: ν = 1 / 2Π * √ (g / l); g / l = ν ^ 2 * 4 * Π ^ 2 and ν ^ 2 * l = g / (4 * Π ^ 2).
The resulting equality: νn2 * ln = g / (4 * Π ^ 2) = νk ^ 2 * lk, whence we express: lk / ln = νn ^ 2 / νk ^ 2 = 5 ^ 2/3 ^ 2> 1, therefore, lk> ln, the length of the thread was increased.
Answer: The length of the thread was increased.