so clAo puc vA Blo rAo udNc ru, x? fiu CHQN Eor r{rYEN HQC SINH Cr6r DqITHI QG NAU Hec 2oto zalt luc hrcmg tdc gIAa Z ltrOl tr.u. Dd chinh thtfrc of rur ION vAT Lf Thdi gian tdm bdi: t80 phrtt hbng k€ thdi giarc phdt di) Ngly thi: 31.thang 10 ndm 2CI10 (D0 thi gdm c6: 02 trang) C0u 1.: (3 tli6m). MQt qud c6u nho treo dAu mQt dfiy nhg clhi i,dAu kia crla d0y c6 dinh tai A.T4i rti€m O dudi A mQt doqn { ,no phuong thAng dring c6 mQt dinh.K6o quA cAu di5n vi 2a tri diy AB nim ngang vi tha nhe ra. .ye a.Tffi ti s0 lUc cdng dffy ngay trvffc vi sau khi ddy chpm dinh khi qui c6u qua : v til can Dang. b. Xdc dinh vi tri trOn qu d4o cua qu6 cAu tai d6 lpc cdng d0y treo bing O,vfln t5c cua qud cAu ltic d6 bing bao nhi6u? Siu d6 qu6 cdu chuy6n dQng nhu thi5 nio vi lOn d6n d6 cao lcrn nh6t crich di6rn ffeo bao nhi0u? Cilu 2: (3 rli6m) Hai hinh t4r dOng chlt 01, 02cd khOi luqng m1 10kg, trt2 = 30kg d4t tiOp xric nhau trdn hai rn{t phing nghiCng nhan (Pr), (Pz), vudng g6c, nghiOng g6c a = 600 nhu hinh v€ fim: a. G6c tpo boi OrOz vi rn{t phing (P1). b. Ap lgc cria c6c khi5i ku 16n c6c mfit. phing vd 6p (b6 qua mgi ma s6t, l6y g = 10mls2) Ciu 3: (3 tli6m) MQt trong nhirng