Just use Newton's formula
F = GMm/d^2
to find the two forces on the moon.
Then add the vectors to get their resultant.
Post your work if you get stuck.
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force vector F SM that the sun exerts on the moon is perpendicular to the force vector F EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 x 10^30 kg, mass of earth = 5.98 x10^24 kg, mass of moon = 7.35 x 10^22 kg. The distances shown in the drawing are rSM = 1.5 x10^11 m and rEM = 3.85 x 10^8 m. Determine the magnitude of the net gravitational force on the moon.
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