N - КПД
n = 1- T1/T2
T1 - температура холодильника
T2 - температура нагревателя
T1 = T2*(1-n) = 500*0.55 = 275 К = 2*C
F=k*q1*q2/R^2=k*q^2/R^2=9*10^9*10^-16/9*10^-4=10^-3 H
S1=S2
L1=L2
R1=5.5 кОм=5500 Ом
R2=500 Ом
р1/р2=?
R=p*L/S
p=R*S/L
p1/p2=(R1*S/L)/(R2*S/L)=R1/R2=5500/500=11 раз.
Дано:
Масса земли:
![M_g=6*10^{24}](https://tex.z-dn.net/?f=M_g%3D6%2A10%5E%7B24%7D)
Гравитационная постоянная
![G=6.7*10^{-11}](https://tex.z-dn.net/?f=G%3D6.7%2A10%5E%7B-11%7D)
Ускорение свободного падения g=4.9 м/с^2
![g=\frac{GM_G}{r^2}\\ r^2=\frac{GM_G}{g}\\ r=\sqrt{\frac{GM_G}{g}}\\ r=\sqrt{\frac{6*6.7*10^{24}*10^{-11}}{4.9}}\\ r=\sqrt{\frac{40.2}{4.9}*10^{13}}\\ r=\sqrt{8.2*10^{13}}\\ r=\sqrt{82*10^{12}} ](https://tex.z-dn.net/?f=g%3D%5Cfrac%7BGM_G%7D%7Br%5E2%7D%5C%5C%0Ar%5E2%3D%5Cfrac%7BGM_G%7D%7Bg%7D%5C%5C%0Ar%3D%5Csqrt%7B%5Cfrac%7BGM_G%7D%7Bg%7D%7D%5C%5C%0Ar%3D%5Csqrt%7B%5Cfrac%7B6%2A6.7%2A10%5E%7B24%7D%2A10%5E%7B-11%7D%7D%7B4.9%7D%7D%5C%5C%0Ar%3D%5Csqrt%7B%5Cfrac%7B40.2%7D%7B4.9%7D%2A10%5E%7B13%7D%7D%5C%5C%0Ar%3D%5Csqrt%7B8.2%2A10%5E%7B13%7D%7D%5C%5C+r%3D%5Csqrt%7B82%2A10%5E%7B12%7D%7D%0A)
r=9.055385(138)*10^6
Округлим 9.055385(138) до 9
r=9*10^6
r=9'000'000 метров или 9'000 км
Ответ 9000 км