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.
Early Compulsory Education Laws in the U.S. Massachusetts became the first U.S. state to enact a compulsory education law in 1852, having already passed a similar law in 1647 when it was still a British colony. The 1852 law required every city and town to offer primary school, focusing on grammar and basic arithmetic.