1. The model airplane has a mass of 0.90kg and move at a constant speed on a circle that is parallel to the ground. The path of the airplane and its guideline lies in the same horizontal plane. Because the width of the plane is balanced by the lift generated by its wings. Find the tension T in the guideline. The length of the guideline is 17m for speed of 19m/s to 38m/s

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.