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beoquaroi2305
2 năm trước
Một thanh nhôm có tiết diện đều đường kính là 3mm ,độ dài của thanh nhôm là 4m dùng để treo một vật có trọng lượng là 490 N cho biết suấtY- ang bằng 7.10^10 N/m^2 a) TÍnh độ giãn của thanh nhôm? b) Cho biết thanh nhôm chỉ chịu đựng ứng suất lớn nhất bằng 1,3x10^8 N /m^2 .NẾu lực kéo lớn hơn giá trị này thanh sẽ đứt. tính trọng lượng lớn nhất treo vào thanh để thanh không đứt?
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