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In classical mechanics, the stretch rule (sometimes referred to as Routh's rule) states that the moment of inertia of a rigid object is unchanged when the object is stretched parallel to an axis of rotation that is a principal axis, provided that the distribution of mass remains unchanged except in the direction parallel to the axis. This operation leaves cylinders oriented parallel to the axis unchanged in radius. This rule can be applied with the parallel axis theorem and the perpendicular axes rule to find moments of inertia for a variety of shapes.

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  • Stretch rule (en)
  • Regra do estiramento (pt)
  • 伸展定則 (zh)
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  • In classical mechanics, the stretch rule (sometimes referred to as Routh's rule) states that the moment of inertia of a rigid object is unchanged when the object is stretched parallel to an axis of rotation that is a principal axis, provided that the distribution of mass remains unchanged except in the direction parallel to the axis. This operation leaves cylinders oriented parallel to the axis unchanged in radius. This rule can be applied with the parallel axis theorem and the perpendicular axes rule to find moments of inertia for a variety of shapes. (en)
  • 在物理學裏,伸展定則闡明,如果將一個物體的任何一點,平行地沿著一支直軸作任意大小的位移,則此物體對此軸的轉動慣量不變。 我們可以想像,將一個物體,平行於直軸地,往兩端拉開。在物體伸展的同時,保持物體任何一點離直軸的垂直距離不變,則伸展定則闡明此物體對此軸的轉動慣量不變。 伸展定則、垂直軸定理、平行軸定理,這些工具都可以用來求得許多不同形狀的物體的轉動慣量。 (zh)
  • Em física, a regra do estiramento,ou regra do alongamento, afirma que o momento de inércia de um objeto rígido mantém-se inalterado quando o estiramento de um objeto é paralelo ao eixo de rotação, (sem mudança da distribuição de massa, exceto na direção paralela ao eixo). Ou seja, dado um cilindros orientados paralelamente ao eixo de rotação, alterar o comprimento na direção do eixo não altera o momento de inércia do cilindro contanto que o raio não mude. (pt)
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  • In classical mechanics, the stretch rule (sometimes referred to as Routh's rule) states that the moment of inertia of a rigid object is unchanged when the object is stretched parallel to an axis of rotation that is a principal axis, provided that the distribution of mass remains unchanged except in the direction parallel to the axis. This operation leaves cylinders oriented parallel to the axis unchanged in radius. This rule can be applied with the parallel axis theorem and the perpendicular axes rule to find moments of inertia for a variety of shapes. (en)
  • Em física, a regra do estiramento,ou regra do alongamento, afirma que o momento de inércia de um objeto rígido mantém-se inalterado quando o estiramento de um objeto é paralelo ao eixo de rotação, (sem mudança da distribuição de massa, exceto na direção paralela ao eixo). Ou seja, dado um cilindros orientados paralelamente ao eixo de rotação, alterar o comprimento na direção do eixo não altera o momento de inércia do cilindro contanto que o raio não mude. Esta regra pode ser aplicada com o teorema dos eixos paralelos e a teorema dos eixos perpendiculares para encontrar momentos de inércia para uma variedade de formas. (pt)
  • 在物理學裏,伸展定則闡明,如果將一個物體的任何一點,平行地沿著一支直軸作任意大小的位移,則此物體對此軸的轉動慣量不變。 我們可以想像,將一個物體,平行於直軸地,往兩端拉開。在物體伸展的同時,保持物體任何一點離直軸的垂直距離不變,則伸展定則闡明此物體對此軸的轉動慣量不變。 伸展定則、垂直軸定理、平行軸定理,這些工具都可以用來求得許多不同形狀的物體的轉動慣量。 (zh)
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