Physics
Kepler's law of planetary motion states that the square of the time period is proportional to the

Fourth power of the semi-major axis
Semi-major axis
Square of the semi-major axis
Cube of the semi-major axis

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 0°C
Density of water at 4°C to the density of the substance
Density of the substance to the density of water
Density of the substance to the density of water at 4°C

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