Define the universal law of gravitation. What is the unit and value of gravitational constant?
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The force of attraction between any two unit masses separated by a unit distance is called universal gravitational constant denoted by G measured in Nm2/kg2. ... The value of the gravitational constant is the same throughout the universe. The value of G is different from g, which denotes the acceleration due to gravity
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Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
The measured value of the constant is known with some certainty to four significant digits. In SI units, its value is approximately 6.674×10−11 m3⋅kg−1⋅s−2