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In 1828, Ányos Jedlik, a Hungarian who invented an early electric motor, constructed a tiny model car powered by his new motor. [8] In 1834, Vermont blacksmith Thomas Davenport , the inventor of the first American DC electric motor , installed his motor in a small model car, which he operated on a short circular electrified track. [ 24 ]
Number systems have progressed from the use of fingers and tally marks, perhaps more than 40,000 years ago, to the use of sets of glyphs able to represent any conceivable number efficiently. The earliest known unambiguous notations for numbers emerged in Mesopotamia about 5000 or 6000 years ago.
For the first time Karl Benz publicly drove the car on July 3, 1886, in Mannheim at a top speed of 16 km/h (10 mph). [10] Benz later made more models of the Motorwagen: model number 2 had 1.1 kW (1.5 hp) engine, and model number 3 had 1.5 kW (2 hp) engine, allowing the vehicle to reach a maximum speed of approximately 16 km/h (10 mph).
Without the shift towards SUVs, energy use per unit distance could have fallen 30% more than it did from 2010 to 2022. [84] Car exhaust gas is one type of pollution. Car production and use has a large number of environmental impacts: it causes local air pollution plastic pollution and contributes to greenhouse gas emissions and climate change. [85]
After reaching the maximum reading, an odometer or trip meter restarts from zero, called odometer rollover. Digital odometers may not rollover. [16] Most modern cars include a trip meter (trip odometer). Unlike the odometer, a trip meter is reset at any point in a journey, making it possible to record the distance traveled in any particular ...
Detail of a cubit rod in the Museo Egizio of Turin The earliest recorded systems of weights and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for ...
2023 – The first test-runs of a superconducting maglev test line, called a hyperloop, are carried out in Datong, China (50 km/h of ~1,000 km/h). Hyperloop One conducted the world's first test carrying passengers in pods, reaching a speed of 172 km/h in Los Angeles in 2020, but reportedly abandoned the goal of transporting humans as of 2023. [93]
c. 20,000 BC — Nile Valley, Ishango Bone: suggested, though disputed, as the earliest reference to prime numbers as also a common number. [1] c. 3400 BC — the Sumerians invent the first so-known numeral system, [dubious – discuss] and a system of weights and measures.