1/ Một bộ truyền đai có kích thước các bánh như sau: bánh dẫn (D1=300mm), bánh bị dẫn (D2= 600mm) . a/ Hãy tính tỉ số truyền i của bộ truyền trên. b/ Giả sử bánh dẫn quay với tốc độ n1 =900vòng /phút thì bánh bị dẫn quay với tốc độ bao nhiêu?

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