A. $0.10 \, \text{m} \, 10 \, \text{Hz} \, 10\pi \, \text{s}^{-1}$
B. $0.10 \, \text{m} \, 10 \, \text{Hz} \, 20\pi \, \text{s}^{-1}$
C. $0.20 \, \text{m} \, 20 \, \text{Hz} \, 20\pi \, \text{s}^{-1}$
D. $0.20 \, \text{m} \, 20 \, \text{Hz} \, 10\pi \, \text{s}^{-1}$
9-8 若简谐振动方程为 =0.10cos (20pi t+dfrac (pi )(4)), 式中x的单位为m,t的单位为s,求:-|||-(1)振幅、频率、角
若简谐振动方程为x=0.10cos(20pi t+0.25pi )，式中x的单位为m，t的单位为s，则周期和初相为（ ）A 0.1, (s) 0.25piB 0
[9-8-3]若简谐振动方程为x=0.10cos (20pi t+0.25pi ),式中x的单位mt的单位s,则t=2 s时的位移,速度和加速度为()A.
若简谐运动方程为=0.2cos (2pi t+dfrac (pi )(6))式中x的单位m，t的单位为s，求：振幅为_______m， 周期为_______s，
(10)一质点做简谐振动,其振动方程为-|||-=3times (10)^-2cos (5pi t+0.25pi ) (SI单位)-|||-求振动的振幅、频率和
已知两同方向同频率的运动方程分别为x1 =0.05cos (10 t+0.75pi ), x2 =0.06cos (10 t+0.25pi ),式中x1
两个同方向、同频率的简谐振动，振动方程分别为：x_1 = 6cos(10t - (pi)/(6))cm，x_2 = 8cos(10t + (pi)/(3))cm
某质点参与_(1)=10cos (pi t-dfrac (pi )(2))cm 及 _(2)=20cos (pi t+dfrac (pi )(2))cm两个同方
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两简谐振动的振动方程分别为_(1)=3cos (2pi t-dfrac (pi )(3)), _(2)=4cos (2pi t+dfrac (pi )(6))单