[问答题]
Construct a Table indicating the position x of the mass in Fig. 11–2
*4s7tl n k lw+wds2 pxib 9tcg;3se4.g at times t
b9.*+ts4g7ldig ;n l ssp3 ewtk 24wxc1tl0 dvj(,r hb=
vtb(,d1 r0hj l0,t = $\frac{1}{4}T$,$\frac{1}{2}T$,$\frac{3}{4}T$,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)?
