[问答题]
Construct a Table in
1kswpb s;(.y 24hatzq*3o lw qt k7a73hydz j0dicating the posit
jj bzg.3 u1.b2e1ytzfion x of the mass in Fig. 11–2 at times t = 0,t =
ej bt. zbgj. 1z2f3u1y$\frac{1}{4}T$,$\frac{1}{2}T$,$\frac{3}{4}T$,T and $\frac{5}{4}T$,where T is the period of oscillation. On a graph of x vs. t, plot these six points. Now connect these points with a smooth curve. Based on these simple considerations, does your curve resemble that of a cosine or sine wave (Fig. 11–8a or 11–9)?

