Question

pentru ce viteza relativa a miscarii contractia relativista reprezinta 75% din lungimea corpului in stare de repaus

Answer 1

l=l₀/γ

l=75%l₀=0,75l₀

l=l₀/γ<=>0,75l₀=l₀/γ=>1/γ=0,75=>γ=1/0,75=1,33

γ=1/√(1-v²/c²)=>1=γ√(1-v²/c²) |()²=>1/γ²=1-v²/c²<=>1/1,33²-1=-v²/c²<=>-0,43=-v²/c²=>v²=0,43c²=>v=√0,43c²=0,65c

v=0,65c