S=180*10^-4 м2 B=2.5*10^-2 Тл Δt=0.12 c E=0.27 B N=?
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E=ΔФ/Δt
ΔФ=N*B*S
N=E*Δt/(B*S)=0.27*0.12/(2.5*10^-2*180*10^-4)=72 витка
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Дельта Т = Т2-Т1=45-25=20
M*V^2/2=Ep+Ek
Ek=Ep/4
m*V^2/2=Ep+Ep/4=5*Ep/4=5*m*g*h/4
h=2*V^2/5*g=2*25/5*10=1 м