%lisp >(load "/projects/cs375/physics.lsp") >(phys '(what is the area of a circle with diameter = 10)) 78.539816339744831 >(phys '(what is the circumference of a circle with an area of 100)) 35.449077018110316 >(phys '(what is the power of a lift with mass = 100 and height = 6 and time = 10)) 588.399