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A simple machine is a mechanical device that changes the direction or magnitude of a force. [1] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. [2] Usually the term refers to the six classical simple machines that were defined by Renaissance scientists: [3] [4 ...
[1] [2] [3] The inclined plane is one of the six classical simple machines defined by Renaissance scientists. Inclined planes are used to move heavy loads over vertical obstacles. Examples vary from a ramp used to load goods into a truck, to a person walking up a pedestrian ramp, to an automobile or railroad train climbing a grade. [3]
The Lower Paleolithic period lasted over 3 million years, during which there many human-like species evolved including toward the end of this period, Homo sapiens.The original divergence between humans and chimpanzees occurred 13 (), however interbreeding continued until as recently as 4 Ma, with the first species clearly belonging to the human (and not chimpanzee) lineage being ...
Teaching machines were originally mechanical devices that presented educational materials and taught students. They were first invented by Sidney L. Pressey in the mid-1920s. [1] His machine originally administered multiple-choice questions. The machine could be set so it moved on only when the student got the right answer.
The right of conquest was historically a right of ownership to land after immediate possession via force of arms. It was recognized as a principle of international law that gradually deteriorated in significance until its proscription in the aftermath of World War II following the concept of crimes against peace introduced in the Nuremberg Principles.
Two out of the four schools of Islamic law, i.e. Hanafi and Maliki schools, accepted non-Arab polytheists to be eligible for the dhimmi status. Under this doctrine, Arab polytheists were forced to choose between conversion and death. However, according to perception of most Muslim jurists, all Arabs had embraced Islam during the lifetime of ...
For example, Ioánnis Fokás (known as Juan de Fuca) was a Castilian of Greek origin who discovered the strait that bears his name between Vancouver Island and Washington state in 1592. German-born Nikolaus Federmann , Hispanicised as Nicolás de Federmán, was a conquistador in Venezuela and Colombia.
Conquest is the act of military subjugation of an enemy by force of arms. [ 1 ] [ 2 ] Military history provides many examples of conquest: the Roman conquest of Britain , the Mauryan conquest of Afghanistan and of vast areas of the Indian subcontinent , the Spanish conquest of the Aztec Empire and various Muslim conquests , to mention just a few.