Two small charged spheres are suspended from the ceiling, on a silk fiber. The charge on each sphere is +0.10 µC and -0.10 µC. The mass of each of the spheres is 9.0 grams (change to kg). Calculate the separation of the two spheres if the net force acting on the bottom sphere is zero.

In which scenario is the least amount of work done on a crate? a force of 120 n moves it 25 m. a force of 115 n moves it 26 m. a force of 130 n moves it 22 m. a force of 125 n moves it 27 m.

In the sport of parasailing, a person is attached to a rope being pulled by a boat while hanging from a parachute-like sail. a rider is towed at a constant speed by a rope that is at an angle of 15 ∘ from horizontal. the tension in the rope is 1900 n. the force of the sail on the rider is 30∘ from horizontal. what is the weight of the rider? express your answer with the appropriate units.

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?