2026年4月2日 09:46 科技动态
Дмитриев описал возможный сценарий развития топливного кризиса в Европе20:04
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This coefficient μs is just a number, usually between 0 and 1, which you can look up in a table for all kinds of different materials. For rubber tires on asphalt, it’s 0.9; for tires on ice it falls to 0.15 (hence snow chains). And N, as we saw above, equals the gravitational force, which in turn depends on the object’s mass. The greater the mass, the more friction you get.
美国多城再度爆发"反对君主"大规模示威