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Một thước mảnh có thể quay quanh một trục nằm ngang đi qua đầu O của thước. Gọi xx’ là đường thẳng đứng đi qua O, góc α là góc giữa thanh và trục xx’ (Hình 3.8). Hãy tính momen của trọng lực của thanh đối với trục nằm ngang qua O tại các vị trí của thanh ứng với các góc α = π 4 ;   π 2 ;   π " 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" style="width: 84.00px; height: 32.00px; margin-left: 0.00px; margin-top: 0.00px; transform: rotate(0.00rad) translateZ(0px); -webkit-transform: rotate(0.00rad) translateZ(0px);" title="alpha equals straight pi over 4 semicolon space straight pi over 2 semicolon space straight pi"> Biết m = 0,03kg; OG = a = 20cm; g = 9,8m/s 2 .

Một thước mảnh có thể quay quanh một trục nằm ngang đi qua đầu O của thước. Gọi xx’ là đường thẳng đứng đi qua O, góc α là góc giữa thanh và trục xx’ (Hình 3.8). Hãy tính momen của trọng lực của thanh đối với trục nằm ngang qua O tại các vị trí của thanh ứng với các góc <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#x3B1;</mi><mo>=</mo><mfrac><mi mathvariant="normal">&#x3C0;</mi><mn>4</mn></mfrac><mo>;</mo><mo>&#xA0;</mo><mfrac><mi mathvariant="normal">&#x3C0;</mi><mn>2</mn></mfrac><mo>;</mo><mo>&#xA0;</mo><mi mathvariant="normal">&#x3C0;</mi></math>

Biết m = 0,03kg; OG = a = 20cm; g = 9,8m/s2.

 

 

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