The time for one complete cycle, a left swing and a right swing, is called the period. The period depends on the length of the pendulum, and also to a slight degree on the amplitude, the width of the pendulum's swing.he period of swing of a simple gravity pendulum depends on its length, the local strength of gravity, and to a small extent on the maximum angle that the pendulum swings away from vertical, Î¸0, called the amplitude.
Compulsory elementary schooling was formally introduced in Sweden in 1842. A process of reform, destined to take many years, began in the 1940's with the aim of expanding compulsory schooling.
2 Cyprus: Compulsory school age is reached by children who are five years eight months old before 1 September. Pre-primary education is compulsory for five-to six-year-olds, that is, for one year, for children who are four years and eight months old by 1 September. 3 England: Children reach compulsory school age at the start of the school term following their fifth birthday, which may be in September, January or April.