速度聚焦质谱仪

分集介绍:导数,斜率,速度与变化率 Derivatives.slope.velocity.rate.of.change

发表于:2019-01-05 / 阅读(283) / 评论(0) 分类 麻省理工学院公开课:单变量微积分

One hundred years ago today, September (the) 27th, 1905, a physics paper was dropped into the mail, addressed to a German journal called AT. The paper was penned by a 26-year-old Swiss patent clerk with dark curly hair years before he sprouted that s

发表于:2019-01-08 / 阅读(113) / 评论(0) 分类 2005年NPR美国国家公共电台

Imagine the disc of our galaxy, if you just took a disc of stars and put it there, gravity would tend to make this disc collapse/ into itself and it would immediately just fall together. That is not what we see with the galaxy. Whats actually going o

发表于:2019-01-22 / 阅读(36) / 评论(0) 分类 自然百科2011年

The explosion generated a shockwave so massive it wasdetected over 15,000 kilometres away. The low-frequency waves were picked up bymonitoring stations. So it is kind of like a listening network around theworld. Thats right. Theyre not set up for fir

发表于:2019-01-23 / 阅读(26) / 评论(0) 分类 探索与发现2014年

All right then! Imagine this weapon to be ten times stronger and the animal ten times more powerful, launch it at a speed of twenty miles per hour, multiply its mass times its velocity, and you get just the collision we need to cause the specified ca

发表于:2019-01-27 / 阅读(33) / 评论(0) 分类 《海底两万里》中英双语有声读物

Whilst waiting for dinner at Youngs inn, at the confluence of Salt River with the Ohio, 在当地青年旅馆就餐前的闲暇期间,在盐湖与俄亥俄州一处接壤地带, I saw, at my leisure, immense legions still going by, with a front r

发表于:2019-02-13 / 阅读(18) / 评论(0) 分类 美国语文第五册
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