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Physics, 17.12.2021 07:50 arionaking59p71cfc
con lăn hai bậc có bán kính vành ngoài R=0,8 m, bán kính vành trong r=0,5 m lăn không trượt trên mặt phẳng cố định . dây được cuốn vào vành trong của con lăn , đầu D của dây được kéo với vận tốc v= 0,2 m/s. Tìm vận tốc của các điểm B, M
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con lăn hai bậc có bán kính vành ngoài R=0,8 m, bán kính vành trong r=0,5 m lăn không trượt trên mặt...
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