质量 =10g 的小球与轻弹簧组成一振动系统,按 x=-|||-.5cos (8pi t+dfrac (pi )(3)) (式中x的单位为cm,t的单位为s)的规律作自由振动,求:-|||-(1)振动的角频率、周期、振幅和初相;(2)振动的能量;(3)一个周期内的平均-|||-动能和平均势能.

9-30 质量 m=10g 的小球与轻弹簧组成一振动系统,按 x=-|||-.5cos (8pi t+dfrac (pi )(3)) (式中x的单位为cm,t的

质量 m=10g 的小球与轻弹簧组成一振动系统,按 =0.5cos (8pi t+dfrac (pi )(3)) (式中x的单位为-|||-cm,t的单位为s

5.7 质量为 times (10)^-3kg 的小球与轻弹簧组成的系统,按 =0.1cos (8pi t+dfrac (2pi )(3)) (SI)的-|||

.8-1 质量为 times (10)^-3kg 的小球与轻弹簧组成的系统,按 =0.1cos (8pi t+dfrac (2pi )(3)) (SI)的规律做

【题目】某质点参与 _(1)=5cos (pi t-dfrac (pi )(2))cm 及-|||-_(2)=5cos (pi t+dfrac (pi )(2)

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

有两个振动方向相同的简谐振动,其振动方程分别为-|||-_(1)=10cos (2pi t+pi )cm, _(2)=10cos (2pi t+dfrac (p

6.5178:一质点沿x轴作简谐振动,振动方程为 =4times (10)^-2cos (2pi t+dfrac (1)(3)pi )(S1) t=-|||-0

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

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