In order to rotate the polarization axis of a beam of linearly polarized light by 90.0° , a student places sheets p1 and p2 with their transmission axes at 45.0° and 90.0° , respectively, to the beam’s axis of polarization.
(a) what fraction of the incident light passes through p1
(b) through the combination?
(c) repeat your calculations for part (b) for transmission-axis angles of 30.0° and 90.0°, respectively.

Arotating space station is said to create “artificial gravity”—a loosely-defined term used for an acceleration that would be crudely similar to gravity. the outer wall of the rotating space station would become a floor for the astronauts, and centripetal acceleration supplied by the floor would allow astronauts to exercise and maintain muscle and bone strength more naturally than in non-rotating space environments. if the space station is 200 m in diameter, what angular velocity would produce an “artificial gravity” of 9.80 m/s^{2} 2 at the rim?

The sun’s mass is 2.0×10^ 30 kg, its radius is 7.0×10 5 km, and it has a rotational period of approximately 28 days. if the sun should collapse into a white dwarf of radius 3.5×10 3 km, what would its period be if no mass were ejected and a sphere of uniform density can model the sun both before and after?

The discovery of the electron as a subatomic particle was a result of