Sunlight, wind and water are often used to make what type of energy? a. heat b. nuclear c. electricity d. geothermal

If the radius of curvature of the cornea is 0.75 cm when the eye is focusing on an object 36.0 cm from the cornea vertex and the indexes of refraction are as described before, what is the distance from the cornea vertex to the retina? express your answer to two significant

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

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c