Considere uma peça maciça de largura 10 cm e altura 20 cm, conforme a figura-1.



Figura-1.

Eixos



Inicialmente foi encontrada a inércia da peça em relação aos eixos x e y, posteriormente o eixo de rotação foi alterado para x' e y'.

Assinale a alternativa que apresenta corretamente estas inércias.

Escolha uma:
a.
straight I subscript straight x space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight y space equals space 1.666 comma 67 cm to the power of 4 comma space straight I subscript straight x apostrophe end subscript space equals space 26.666 comma 67 cm to the power of 4 comma space straight I subscript straight y apostrophe end subscript space equals space 6.666 comma 67 cm to the power of 4.

b.
straight I subscript straight x space equals space 26.666 comma 67 cm to the power of 4 comma space straight I subscript straight y space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight x apostrophe end subscript space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight y apostrophe end subscript space equals space 1.666 comma 67 cm to the power of 4.

c.
straight I subscript straight x space equals space 1.666 comma 67 cm to the power of 4 comma space straight I subscript straight y space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight x apostrophe end subscript space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight y apostrophe end subscript space equals space 26.666 comma 67 cm to the power of 4.

d.
straight I subscript straight x space equals space 1.666 comma 67 cm to the power of 4 comma space straight I subscript straight y space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight x apostrophe end subscript space equals space 6.666 comma 67 cm to the power of 4 comma space straight I subscript straight y apostrophe end subscript space equals space 26.666 comma 67 cm to the power of 4.

e.
straight I subscript straight x space equals space 7.666 comma 67 cm to the power of 4 comma space straight I subscript straight y space equals space 2.666 comma 67 cm to the power of 4 comma space straight I subscript straight x apostrophe end subscript space equals space 26.666 comma 67 cm to the power of 4 comma space straight I subscript straight y apostrophe end subscript space equals space 6.666 comma 67 cm to the power of 4.