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太陽と月はどちらが強い | 誰かに話したくなる雑学
Author:
• 金曜日, 4月 26th, 2013




潮の干満は、月の引力で起きる・・・小学校の理科で習ったとおりです。

同時に、太陽の引力はせいぜい大潮・小潮、補助的な働きしかしないことも。

それからあなたは、海水に対しては月の引力のほうが強い、と結論してませんか?

実際は、太陽のそれのほうが178倍も強い〈引力=g×2体の質量の積÷距離の2乗〉・・・中学2年程度の計算です。

では、なぜ月が勝つか。

太陽はたいへん遠い(約1億5千万万キロ)から満潮点も干潮点も(地球の半径だけ太陽との距離に差がある)、及ぶ引力はそう違わない(0.08%)。

一方、月はわりと近い(約38万キロ)から、両地点に及ぼす引力の差の割合いは大きく(1.8%)なります。

そこで海水は、いうならば、イタズラッ子が、ヘビー級でもおうようなパパより、ライト級でもロやかましいママのほうをこわがるようなあんばいです。

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