Two small balls, each of mass 5.0 g are attached to silk threads 20 cm long, which in turn are tied to the same point in the ceiling. When the balls are given the same charge Q, the threads hang at 5.0∘ to the vertical, as shown below. What is the magnitude of Q? Q = nC
![A child is on a swing. An adult tied a rope to the seat of the swing and pulled the swing forward. That rope is now horizontal, and the ropes attached to the swing structure make an angle θ with the vertical, as shown. (Note: There are two ropes tied to the chair that go to the top of the swing structure, one on each side of the child. We just see one in the in the image since we are looking at a side view. ) The child has a mass m. The adult uses the rope to hold the child at rest. What is the tension in the horizontal rope, and what are the tensions in each of the ropes connecting the seat to the top of the swing structure? [Use the following values. θ = 50.0∘, m = 25.0 kg ]](https://www.doubtrix.com/uploads/editor/8983639982scsdsdkvvh.png)
