every few hundred yearsmost of the planets line up on the same side of the sunca

Question

every few hundred yearsmost of the planets line up on the same side of the suncalculate the total force on the earth due to venus jupiter andsaturn
In this problem, why is the distance from the earth to the sunsquared? Chapter 5 problem #40. The gravitation equation isf = G(m1)(m2)/r2 why would m2 be squared? every few hundred yearsmost of the planets line up on the same side of the suncalculate the total force on the earth due to venus jupiter andsaturn
In this problem, why is the distance from the earth to the sunsquared? Chapter 5 problem #40. The gravitation equation isf = G(m1)(m2)/r2 why would m2 be squared?

Explanation / Answer

   if we want to calculate the force on earthso we need the distance of each planet from earth    rearth,venus = (150 - 108) x106 km    rearth,jupiter = (778 - 150) x106 km       rearth,saturn = (1430 - 150) x106 km    jupiter and saturn will exert a rightwardforce while venus will exert a leftward force for simplicity let ustake the right    direction as positive so that we getthat    Fearth,planets = G(Mearth Mjupiter /rearth,jupiter2) + G (MearthMsaturn / rearth,saturn2) + G(Mearth Mvenus /                            rearth,venus2)                       = .......... N

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