Question

质点做简谐运动时,在某一时刻达到平衡位置且面向正向移动,则该时刻的相位为?

Answer 1

x =A cos(ωt-π/2),
v = -Aω sin(ωt-π/2),
(ωt0-π/2) = -π/2 ,x =0,v = Aω >0