Flying Machines

Flying Machines pdf epub mobi txt 电子书 下载 2025

出版者:Kessinger Publishing
作者:W. J. Jackman
出品人:
页数:144
译者:
出版时间:2004-06-30
价格:USD 20.95
装帧:Paperback
isbn号码:9781419120145
丛书系列:
图书标签:
  • 百科 
  • 工程 
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Take a circular-shaped bit of cardboard, like the lid of a hat box, and remove the bent-over portion so as to have a perfectly flat surface with a clean, sharp edge. Holding the cardboard at arm's length, withdraw your hand, leaving the cardboard without support. What is the result? The cardboard, being heavier than air, and having nothing to sustain it, will fall to the ground. Pick it up and throw it, with considerable force, against the wind edgewise.

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