А10. T = 2pi*sqrt(l/g)
l1 = 4*l2
T1 = 2pi*sqrt( l1/g )
T2 = 2pi*sqrt( l2/g )
T1 / T2 = sqrt(l1/g) : sqrt(l2/g) = sqrt (l1/l2) = sqrt (4l2/l2) = sqrt(4) = 2
T1 = 2T2
Ответ: 5)
A12. N/Na = m/M
N = m*Na/M = 0,004 * 6,02 * 10^23/32*10^(-3) = 7,5 * 10^22
Ответ: 4)