For a diverging lens with one flat surface, the radius of curvature for the curved surface is 8 cm. what must the index of refraction be so that the focal length is -15 cm? a) 1.1632 b) 1.56 c) 1.35088 d) 1.18 e) 1.533

How does convection affect our atmosphere? our layers of earth? our oceans?

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.