The Time Before Fire What is fire anyway? Well, fire is rapid oxidization . Its the energy released when oxygen atoms start combining with carbon and hydrogen atoms. Exactly, so without oxygen in the air, nothing burns. You mean there was a time befo

发表于:2019-01-26 / 阅读(56) / 评论(0) 分类 英语听力文摘 English Digest

Swinging Physics: Potential And Kinetic Energy Working Together 动能与势能相互作用 动能是所有能看到的运动的能量,包括物体的,微粒的或质点集的运动等。 势能(Potential energy )是位置的函数,例如把一个

发表于:2019-02-24 / 阅读(55) / 评论(0) 分类 英语听力文摘 English Digest