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Question 1:
What is this equation? F=G*m1*m2/d^2
A. the atomic number of an isotope of uranium at distance d from the nucleus
B. the force of gravity between two bodies of masses m1 and m2 at distance d
C. the thermal force between two masses, m1 and m2 at a distance d from the isothermal center
D. the focal length of a lens of diopter length m1 and m2 at distance d

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