Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
a. ultraviolet rays
b. infrared waves
c. x rays
d. cosmic rays

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.

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential

What is the power rating of the lightbulb if 3.0 a flow through it when connected to a 15 v battery