Question

Enuntul este in poza

Answer 1

vmax=ωA=785*4=3140 mm/s=3,14 m/s

v=√(E/ρ)=√(6,75*10¹⁰/2700)=√(6750*10⁷/2700)=√(2,5*10⁷)=5000 m/s

Δφ₁=π/4;Δφ₂=π/3

Δφ₁=2πx/λ=>x=λΔφ₁/2π=λ*π/4/2π=λ/8

Δφ₂=2πy/λ=>y=λΔφ₂/2π=λπ/3/2π=λ/6

L=x+y=λ/8+λ/6=(3λ+4λ)/24=7λ/24

λ=2πv/ω=2*3,14*5000/785=31400/785=40 m

L=7λ/24=7*40/24=280/24=11,666 m