Take any ten books off a shelf and note the last page number. what are the number average and weight-average number of pages of these books? why is the weight-average number of pages greater than the number- average? what is the polydispersity index? could it ever be unity?

An engineer decides to use a slightly weaker material rather than a stronger material, since she knows that the stronger material can break suddenly. this is an example of what? a choosing a material that will show warning before it fails b using composite materials that combine strength c using a material for multiple applications d using design techniques that increase efficiency and reduce cost