翻訳と辞書 Words near each other ・ Rotation Model of Learning ・ Rotation number ・ Rotation of ammunition ・ Rotation of axes ・ Rotation operator ・ Rotation operator (quantum mechanics) ・ Rotation period ・ Rotation system ・ Rotational angiography ・ Rotational bell painting ・ Rotational Brownian motion ・ Rotational Brownian motion (astronomy) ・ Rotational correlation time ・ Rotational cryptanalysis ・ Rotational diffusion ・ Rotational energy ・ Rotational invariance ・ Rotational modulation collimator ・ Rotational molding ・ Rotational mouse ・ Rotational partition function ・ Rotational sampling in wind turbines ・ Rotational spectroscopy ・ Rotational speed ・ Rotational symmetry ・ Rotational temperature ・ Rotational transition ・ Rotational viscosity ・ Rotational–vibrational coupling ・ Rotational–vibrational spectroscopy Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Rotational energy ： ウィキペディア英語版 Rotational energy The rotational energy or angular kinetic energy is the kinetic energy due to the rotation of an object and is part of its total kinetic energy. Looking at rotational energy separately around an object's axis of rotation, one gets the following dependence on the object's moment of inertia: :$E\_\backslash mathrm\; =\; \backslash frac\; I\; \backslash omega^2$ where : $\backslash omega\; \backslash$ is the angular velocity : $I\; \backslash$ is the moment of inertia around the axis of rotation : $E\; \backslash$ is the kinetic energy The mechanical work required for / applied during rotation is the torque times the rotation angle. The instantaneous power of an angularly accelerating body is the torque times the angular velocity. For free-floating (unattached) objects, the axis of rotation is commonly around its center of mass. Note the close relationship between the result for rotational energy and the energy held by linear (or translational) motion: :$E\_\backslash mathrm\; =\; \backslash frac\; m\; v^2$ In the rotating system, the moment of inertia, ''I'', takes the role of the mass, ''m'', and the angular velocity, $\backslash omega$, takes the role of the linear velocity, ''v''. The ''rotational energy'' of a rolling cylinder varies from one half of the translational energy (if it is massive) to the same as the translational energy (if it is hollow). As an example, let us calculate the rotational kinetic energy of the Earth. As the Earth has a period of about 23.93 hours, it has an angular velocity of 7.29×10−5 rad/s. The Earth has a moment of inertia, I = 8.04×1037 kg·m2.〔(Moment of inertia--Earth ), Wolfram〕 Therefore, it has a rotational kinetic energy of 2.138×1029 J. Part of it can be tapped using tidal power. Additional friction of the two global tidal waves creates energy in a physical manner, infinitesimally slowing down Earth's angular velocity ''ω''. Due to the conservation of angular momentum, this process transfers angular momentum to the Moon's orbital motion, increasing its distance from Earth and its orbital period (see tidal locking for a more detailed explanation of this process). ==See also== *Flywheel *List of energy storage projects *Rigid rotor *Rotational spectroscopy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rotational energy」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.