Q. What is the smallest thickness of a soap film (n = 1.41) that would appear black if illuminated with 450 nm light? Assume there is air on both sides of the soap film.
Q. A force F = (2. N/m^2)x^2i is applied to a particle initially at rest in the xy plane. Find the work done by this force on the particle and the final speed of the particle as it moves along a path that is (b) in a straight line from point (1.9 m, 1.9 m) to point (5.3 m, 6.4 m). The given force is the only force doing work on the particle.