The rails on a railroad are built from thirty- foot sections. When a train wheel passes over the junction between two sections, there is an audible click. Inside a train that is traveling at 70mph, how many clicks will a passenger hear each twenty seconds?
In attempting to calculate the carrying capacity of a cylindrical pipe, Avery measured the outer diameter to be 2 inches, neglecting to notice that the pipe was one eighth of an inch thick. By what percent did Avery overestimate the carrying capacity of the pipe?