Superconductive wires cost more to make and install then copper wires, so why would a manufacturer of electrical equipment; like generators, consider switching to superconducting wires for the electromagnetic windings of the generator?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight