质点作简谐运动,振动曲线如图所示,其振动方程的初相位φ为( )A.dfrac (pi )(2)B.dfrac (pi )(2)C.0D.πdfrac (pi )(2)

A、 dfrac (pi )(6) B、 dfrac (2pi )(3) C、 dfrac (4pi )(3) D、 dfrac (pi )(3)-|||-2、

3.要使函数φ(x )= ,dfrac {pi )(2)] (B)[π,2π] (C) [ 0,dfrac (pi )(2)] (D) [ dfrac

dfrac (1)(6)m({v)_(0)}^2-|||-5.一质点作一维谐振动,方程为 dfrac ({d)^2x}(d{x)^2}+4x=0 则它的振动周期

[ 0,dfrac (pi )(2)] D. [ -sqrt (dfrac {pi )(2)},0]

已知一质点作简谐振动振动方程为=Asin (omega t+dfrac (pi )(3))则其初相位为=Asin (omega t+dfrac (pi )(3)

一个质点作简谐运动,其运动方程为=0.05cos (pi t-pi )(SI) =dfrac (3)(2)s则其在时的速度为=0.05cos (pi t-pi

(B) pi +dfrac (4)(3) (C) pi +2 . (D) pi +dfrac (8)(3)

已知简谐运动方程为=0.6cos (dfrac (pi t)(4)+dfrac (5pi )(4)),则振动周期为( )s.已知简谐运动方程为,则振动周期为()

dfrac (pi )(4) C. dfrac (pi )(2) D.π

(B) dfrac (lambda )(2pi {varepsilon )_(0)a}. (C) dfrac (lambda )(4pi {varepsilon