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dongtanb13
2 năm trước
cho bộ truyền đọng đai sau ;bánh dẫn 1 có đường kính 20 cm , bánh bị dẫn 2 có dường kính là 10 cm A.tính tỉ số truyền i của bộ truyền động đai ? B hãy xác định tốc đọ quay của bánh bị dẫn 2 ,biết rằng bánh dẫn 1 quay với tốc độ 15 vòng /phút
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