For the garage door of height l, there are massless and frictionless rollers at a and b that move in the guide. The horizontal portion of the guide is at a height h above the floor. Two springs each with a spring constant k assist the door's motion (only one spring is shown in this cross section view
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The great man theory is a 19th century idea according to which history can be explained to a great extent by the influence of great men, or heroes; Highly influential and unique individuals who, due to their natural characteristics, such as superior intelligence, heroic courage, or divine inspiration, have a decisive historical influence. This theory is mainly attributed by the Scottish philosopher and essayist Thomas Carlile who gave a series of lectures on heroism in 1840, which was later published as Heroes in On Heroes, Hero-worship and History, including They said:
Universal history, the history of the work that man has done in this world, is at the bottom of the history of great men working here. He was the leader of men, these great people; modellers, patterns, and creators in a broader sense, who were also deprived of committing or attaining the common mass of men; The things we see in the world as fulfilling are external material results, practical realizations and tangible forms, which merge into the great men sent into the world: the soul of the history of the whole world, it can be considered justified. Had history
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