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thienphudoan000
2 năm trước
Một thanh thép dài 2m và tiết diện 2cm2, chịu 1 lực kéo nên dài thêm 1,5mm. Hãy xác định giá trị của lực kéo đó. Phải đặt lên thanh một trọng vật nhỏ nhất là bao nhiêu để làm gãy nó nếu giới hạn bền=686.10^6 N/m2, cho E=20,10^10 Pa.
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