M = V *p =L*S*p
S =m / (L*p) = 0.178 / (10 *8900)= 2 *10^-6 м2 = 2мм2
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M = V *p =L*S*p
S =m / (L*p) = 0.178 / (10 *8900)= 2 *10^-6 м2 = 2мм2