What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 550 nm ? the index of refraction of the film is 1.33, and there is air on both sides of the film.

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Aboat radioed a distress call to a coast guard station. at the time of the call, a vector a from the station to the boat had a magnitude of 45.0 km and was directed 15.0° east of north. a vector from the station to the point where the boat was later found is = 30.0 km, 15.0° north of east. what are the components of the vector from the point where the distress call was made to point where the boat was found? in other words, what are the components of vector c = b - a?