Yahoo奇摩 網頁搜尋

  1. 1. This of topic wisdom of self- propelled vehicle for union sound wave sensory element system and artificial...whether has the obstacle. 3. 1. Self- propelled pattern 2. Obstructs evades pattern...

    分類:科學 > 其他:科學 2007年12月18日

  2. ...solar, or nuclear) that are intermittent, or too diffuse, or too cumbersome to directly propel vehicles. Integrated wind-to-hydrogen plants, using...

    分類:科學 > 其他:科學 2010年01月27日

  3. (a) Total energy flow on the "sail" per second = 1000 x 1000 = 106 W By momentum = energy/light speed, the average momentum change (impulse) on the spacecraft is: 106/(3 x 108) = 3.33 x 10-3 kg m/s which is also equivalent to the magnitude of force on the spacecraft. (b) By F...

    分類:科學 > 其他:科學 2007年12月24日