A "spherical capacitor" is constructed of two thin, concentric spherical shells of conducting material. Let a be the radius of the smaller sphere, and b be the radius of the larger sphere.
1. Find the capacitance of a spherical capacitor. Express your resul in terms of a, b, and other contants.

Which surface feature of the moon is characterized by mountainous areas? terrae craters maria regolith

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.