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2 năm trước
Một lò xo có chiều dài tự nhiên 32cm. Khi treo một vật nặng có khối lượng 0,4kg thì chiều dài của lò xo là 35cm. a) Khi vật nặng đứng yên thì vật nặng chụi tác dụng của những lực nào? Nêu phương và chiều của các lực đó? b) Tính độ biến dạng của lò xo. c) Nếu ta móc thêm vào lò xo một quả nặng có khối lượng 0,8kg nữa (trong giới hạn cho phép) thì chiều dài của lò xo lúc đó là bao nhiêu?
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