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t=0时刻,质点P.的位移为10cm 该波波速为6m/s 在tˊ时刻,x =2m处的质点L.沿+y方向运动 x =4m处的质点N.的振动方程为y= —20sin5πt(cm)
3x+4y-36=0 3x-2y-18=0 2x-2y-24=0 2x-4y-36=0
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
S=25t2 S=25t S=50t2 S=50t
y=Acosπ[t-(x-5)/4] y=Acosπ[t-(x+5)/4] y=Acosπ[t+(x+5)/4] y=Acosπ[t+(x-5)/4]
y=Acos(2πt/T+2πx/λ+1/2π) y=Acos(2πt/T+2πx/λ-1/2π) y=Acos(2πt/T-2πx/λ-1/2π) y=Acos(2πt/T-2πx/λ+1/2π)
yp=2cos(4πt-x)m yp=2cos(4πt-π/2)m yp=2cos(4πct+π)m yp=2cos4xπtm
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
x=t2-t y=2t y-2x2=0 y+2x2=0
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
y=Acosπ[t-(x+5)/4] y=Acosπ[t+(x+5)/4] y=Acosπ[t-(x-5)/4] y=Acosπ[t+(x-5)/4]
t=0时小球的坐标为(6 m,5 m) t=1s时小球的速率为11 m/s t=2s时小球的加速度的大小为10 m/s2 小球的运动轨迹是一条抛物线
x=t2-t y=2t y-2x2=0 y+2x2=0
y=Acosπ[t-(x-5)/4] y=Acosπ[t-(x+5)/4] y=Acosπ[t+(x+5)/4] y=Acosπ[t+(x-5)/4]