A(n) is an intentionally constructed, low-impedance electrically conductive path designed and intended to carry current under ground-fault conditions from the point of grounding on a wiring system to the electrical supply source and one that facilitates the operation of the overcurrent device or ground fault detectors on a high-impedance system.

22. the top of a cliff is located a distance h above the ground. at a distance h/2 there is a branch that juts out from the side of the cliff, and on this branch a bird's nest is located. two children throw stones at the nest with the same initial speed, one stone straight downward from the top of the cliff and the other stone straight upward from the ground. in the absence of air resistance, which stone hits the nest in the least amount of time?