(1)Q2/Q1 = T2/T1Q2 = Q1 * T2/T1 = 1120 J(2)e = Q2 / (Q1 - Q2) = T2 / (T1 - T2) = 2/3Q1 = Q2/e + Q2 = 7000 J
即三角函数的叠加 振幅=25 A=5