(a) Draw a free-body diagram for segment \(\mathrm{A}\) of the string at instant \(t\) in Figure 16.39. What is the vector sum of the forces exerted on A? 

(b) What does your answer to part \(a\) tell you about the change in momentum of A? Does your conclusion about A's momentum make sense?

(c) Does the hand do work on the string?

(d) What happens to the energy of the string as the end moves upward?

Transcribed Image Text:

Figure 16.39 Procedure for obtaining a quantitative expression for the wave speed c. (a) Triangular wave pulse generated by lifting end of string at constant velocity (b) In time interval A/, bend advances distance cAl 12 bend t + At 1P v segment A segment B vt Zt (c) Free-body diagram for segment B F AB y x ABx + ABY ta F segment C 2=0 x