1.) Calculate the force of gravity between Earth (mass = 6.0 s 1024 kg) and Venus (mass = 4.9 s 1024 kg) when they are at their closest distance from
each other, 3.8 s 107 km.

2.) Calculate the force of gravity between a car (mass = 2.3 s 103 kg) and a
man (mass = 68 kg) when the man is standing a distance of 5.0 m from
the car.

3.) Calculate the force of gravity that Saturn (mass = 5.7 s 1026 kg) exerts
on a woman on Earth (mass = 61 kg) when Saturn is closest to Earth,
1.2 s 109 km.

The sun's gravitational pull is weaker on the planets that are closer to it, i think.

Ok what do you need with

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge