F1=120H. d1=80см. F2=280H. d2-?

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To find the diameter d2, we can use the formula for the force between two masses using Newton's law of universal gravitation:

F = G (m1 m2) / r^2

where:
F = force between the two masses
G = gravitational constant (6.674 x 10^-11 N*m^2/kg^2)
m1, m2 = masses of the two objects
r = distance between the centers of the two objects

Given:
F1 = 120 N
d1 = 80 cm = 0.8 m
F2 = 280 N

We can set up a ratio of the forces and distances to find the diameter d2:

(120 / 280) = (1 / d2^2)

(1 / d2^2) * 280 = 120

280 / d2^2 = 120

d2^2 = 280 / 120

d2^2 = 2.33

d2 = √2.33 ≈ 1.52 m

Thus, the diameter d2 is approximately 1.52 meters.