Дано R1=R R2=1,5R
F1\F2- ?
F1=kq1*q2\R^2
F2=kq1*q2\2,25*R^2
F1\F2=2,25 ( сила уменьшится в 2,25 лаз)
N/Na=v=2 моль
m=v*M M=2*10^-3 к/.моль
p=m/V=2*2*10^-3/40*10^-3=0,1 кг/м3
90=25 м/с
s=s1+s2=0.5s+0.5s<span>
t=t1+t2
t1=0.5s/v</span>₁<span>
t2=0.5s/v</span>₂<span>
vcp=s/t=s/(t1+t2)=s/(0.5s/v</span>₁<span>+0.5s/v</span>₂<span>) </span>Сократим на<span> s
vcp=1/(0.5/v</span>₁<span>+0.5/v</span>₂<span>)=2*v</span>₁<span>*v</span>₂<span>/(v</span>₁<span>+v</span>₂<span>)=2*25*15/(25+15)= 750/40=18.75 (</span>км/ч<span>)</span>