1) F=k*q1*q2/r² r=√(k*q1*q2/F)=√(9*10^9*3.5*2.4*10^-18/0.5*10^-6)=0.42 м
2) U=E*d=30*1.25=37.5 B
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Q = I^2 * R * ∆t
l = √( Q \ R * ∆t )
I = √( 120 000 \ 50 * 600 ) = 2 A
U1= Uo - gt = 10 -10*0.1 = 9 м/с
p1= m1u1 = 0.06 * 9 = 0.54 кг*м/с
p1=p2 = (m1+m2)u2 =>
u2 = p1/m1+m2 = 0.54/0.12+0.06 = 3м/с
Eкин = (m1+m2)*U2^2/2 = (0.12+0.06) * 3^2/2 = 0.18*9/2 =0.81 Дж