người ta thả một khói gỗ hình trụ bên trên có đặt một vật m1 = 50g vào trong bình nước muối nó nổi thẳng đứng phần chìm trong nước có độ cao h như hình vẽ. nếu bỏ vật ra thì phần chìm trong nước muối giảm so với chiều cao h một đoạn h1 = 0,5cm bây giờ người ta pha thêm muối vào bình sao cho phần chìm của gỗ trong nước có độ cao giảm so vói chiều cao h một đoạn h2= 0,6cm. Để phần chìm của gỗ có chiều cao h như ban đầu người ta phải đặt lên trên nó một vật có khối lượng m2= 63g. tính khối lượng gỗ

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