神马作文网英语的物理题,希望有过程.(^V^)谢谢!
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/10 20:23:22
英语的物理题,希望有过程.(^V^)谢谢!
phase constant=0.75
phase at given state=0.75*0.02-40*0.1=-3.985
wavelength=2π/0.75=8π/3
frequency=40/2π=20/π
so the speed=8π/3 * 20/π=160/3
power=1/2*mass density*amplitude^2*angular frequency^2*speed
=0.5*0.01*0.1^2*40^2*160/3
=4.27W
phase at given state=0.75*0.02-40*0.1=-3.985
wavelength=2π/0.75=8π/3
frequency=40/2π=20/π
so the speed=8π/3 * 20/π=160/3
power=1/2*mass density*amplitude^2*angular frequency^2*speed
=0.5*0.01*0.1^2*40^2*160/3
=4.27W