problem13_67

University Physics with Modern Physics with Mastering Physics (11th Edition)

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
13.67: a) The quantity l is the amount that the origin of coordinates has been moved from the unstretched length of the spring, so the spring is stretched a distance x l - (see Fig. (13.16 ( c ))) and the elastic potential energy is 2 el ) ( ) 2 1 ( x l k U - = . b) ( 29 ( 29 . 2 1 2 1 0 2 2 0 el mgx mgx lx k l kx x x mg U U - + - + = - + = Since , k mg l = the two terms proportional to
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: x cancel, and ( 29 . 2 1 2 1 2 2 mgx l k kx U- + = c) An additive constant to the mechanical energy does not change the dependence of the force on , , dx dU x F x-= and so the relations expressing Newtons laws and the resulting equations of motion are unchanged....
View Full Document

Ask a homework question - tutors are online