Calculate the actual period for a 2 feet and 3 inches long pendulum using the period of the pendulum equation. Explain.

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

The electric field inside a cell membrane is 8.0mn/c. what's the force on a singly charged ion in this field?

For two variables in a direct proportion, what is the result of doubling one variable?