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Mỗi bánh xe có bán kính R=50cm đang quay dưới tác dụng của mô men lực bằng 980Nm. Hãy xác định lực nén vuông góc của mỗi mà phanh tác dụng lên bánh xe để bánh xe quay chậm dần quanh chục của nó với gia tốc góc β = -2.5ml/r². Hệ số ma sát giữa mà phanh và bánh xe 0,25, mô men quán tính của bánh xe đối với trục quanh l=50 kg. m²
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Mỗi bánh xe có bán kính R=50cm đang quay dưới tác dụng của mô men lực bằng 980Nm. Hãy xác định lực n...
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