解： x=0.5cos(8t+ 3 m w=8π=25.12 S1T= 2元 =0.25s Jt A=0.5m 3 vm=wA=8×0.15=12.6m/s am=w2A=(8m)2×0.5=316m/s3 t=1s @t+p)=8r+3 25元 3 兀 49元 t=2s wt+P)=8π×2+ 3 3 兀 241元 t=10s wt+P)=8T×10+ 返回A=0.5m π 3 x = 0.5cos(8 t+ π) m = 3 φ π ω=8 =25.12 s π -1 vm =ωA= 8π× 0.15=12.6m/s 2 am =ω A =(8π) × =316m/s 2 0.5 2 t =1s ω( t +φ )=8π+ = 3 π 25 3 π ω( t +φ )= π× + = 3 π 49 3 t =2s 8 2 π ω( t +φ )= π× + = 3 π 241 3 t =10s 8 10 π T ω 0.25s 2 = π = 解： 返回