t = 3 мин. = 180 секунд.
n = 82 колебаний.
T = t / n = 180 / 82 = 2,1951219512 с.
T = 2 π √ L / g.
T² = 4 π² L / g.
L = T² × g / 4 π².
L = 2,1951219512² × 10 / 4 × 3,14² = 48,185603806 / 39,4384 = 1,2217940841 м.
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t = 3 мин. = 180 секунд.
n = 82 колебаний.
T = t / n = 180 / 82 = 2,1951219512 с.
T = 2 π √ L / g.
T² = 4 π² L / g.
L = T² × g / 4 π².
L = 2,1951219512² × 10 / 4 × 3,14² = 48,185603806 / 39,4384 = 1,2217940841 м.
Ответ:
1,2217940841 м = приблизительно 1 м.