Why does the voltage remain the same if the resistance is increased

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?