An arch is in the shape of a parabola with its vertex at the top. it has a span of 100 feet and a maximum height of 40 feet. find the equation of the parabola, and determine the height of the arch 15 feet from the center of the base of the arch.

What is a subatomic particle with a negative charge and very little mass?

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

First to answer will be the brainliest i need the answer asap