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一个有趣的力学实验
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作者 易其顺 李凡生 黄婷 《力学与实践》 CSCD 北大核心 2010年第4期118-120,共3页
介绍一种由矿泉水瓶制作奇异转动的力学实验,用两个互相垂直的简谐振动的合成来解释其转动的原理,制作模型并进行验证,得出木棒摩擦矿泉水瓶时,瓶盖上的叶片同时参与了两个不同方向的振动,这两个振动合成的结果使得瓶盖上的叶片发生转... 介绍一种由矿泉水瓶制作奇异转动的力学实验,用两个互相垂直的简谐振动的合成来解释其转动的原理,制作模型并进行验证,得出木棒摩擦矿泉水瓶时,瓶盖上的叶片同时参与了两个不同方向的振动,这两个振动合成的结果使得瓶盖上的叶片发生转动的结论. 展开更多
关键词 奇异转动 力学 分析
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Inconsistence of Non-Singular Spherically Symmetric Solution and a Satisfactory Energy-Momentum Complex
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作者 Gamal G.L.Nashed 《Communications in Theoretical Physics》 SCIE CAS CSCD 2010年第10期625-629,共5页
Two spherically symmetric non-singular black hole solutions in Moiler tetrad theory of gravitation have been obtained. Although the two solutions have the same form of metric (spherically symmetric nonsingular black ... Two spherically symmetric non-singular black hole solutions in Moiler tetrad theory of gravitation have been obtained. Although the two solutions have the same form of metric (spherically symmetric nonsingular black hole), their energy contents are different. We use another method given by Gibbons and Hawking to calculate the energy content of these solutions. We also obtained different value of energy. Study the requirements of a satisfactory energymomentum complex given by Moiler we find that the second solution, which behaves as 1/√r, is not transformed as a four-vector under Lorentz transformation. 展开更多
关键词 non-singular black hole solutions energy using Moiler complex energy using Gibbons and Hawking method Lorentz transformatio
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