... n1chu k T1 cũn treo m2 thỡ cú n2 chu k T2 v treo c m1 2 ln m2 thỡ chu k T Thỡ : n1T1 = n2T2 n12T12 n T22 n12 m1 n m2 v T2 = T21 + T22 hoc m = m1 + m2 tỡm T1, T2 , m1, m2 b.Thay i K, m khụng i: ... k Chu k lc: T m( k k ) m T12 T22 k k1 k @ Hai lũ xo cú cng k1, k2 ghộp song song thỡ: k = k1 + k2 T1T2 m 1 Chu k lc: T , T , f k1 k T T1 T2 T12 T22 f12 f 22 Chiu di lũ xo lc treo ... cựng thi gian, lc di l1 cú n1chu k T1 cũn lc l2 thỡ cú n2 chu k T2 Thỡ : 2 n1T1 = n2T2 n12T12 n2 T22 n12 l1 n2 l2 v T2 = T21 T22 hoc l = l1 l2 tỡm T1, T2 , l1, l2 T l @ Nu cho tng cp l...