Ф=B*S*cos(90-a)=0,04*25*10^-4*0,5=0,5*10^-4 Вб
PV1:T1 = pV2:T2
pS(l:2+x):T1 = pS(l:2-x):T2
(l:2+x:T1 = (l:2-x):T2
x = l:2(1/T2-1/T1)/(1/T2+1/T1)=l:2*(T1-T2):(T1+T2)=50/2*(300-200):(300+200)
Ответ: 5 см
<span>Закон Гука F = k*|x |</span>
<span>30000
= k * 0.01</span>
<span>K =
30000/0.01 = 3000000 Н/м</span>
Енергія пружини Е = кх²/2
<span>Е =
3000000*0.05²/2 = 3750 Дж</span>