Một khối gỗ nếu thả trong nước thì thể tích của phần gỗ nổi trên mặt nước bằng 1/3 thể tích của khối gỗ, nếu thả trong dầu thì thể tích phần gỗ nổi trên mặt dầu bằng 1/4 thể tích của khối gỗ. Hãy xác định trọng lượng riêng của dầu, biết trọng lượng riêng của nước là 10000N/m3.

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