... tuong 11 tra Idi cac cdu hdi eua GV tdc gifla chiing thay ddi nhu thd' nao ? Bidu thiic nao didn ta didu dd ? , F12 r , P - , ^ ^ ^12 ! Ql HS thao ludn chung toan Idp, ca nhdn tra Idi: ! P 21 tl2 ... - Tim gia tdc cua hat bui ? F = F,-P=|q|-—mg d = (6 .10 -''U-2 .10 -")N Ap dung dinh ludt H Niuton ta cd : (d.lO-"U-2 .10 -") a= 2 .10 -12 = (0,3U -10 )[H], Quy dao cua hat bui cd dang mdt al^xV doan parabol: ... (1) vd (2) rdng, ndm ngang song song vdi va each $2cm d = 10 cm Tim (1) mang dien duong, t ^ Hem M (2) mang didn dm, didn tfch ttdn hai tdm 10 cm o cd dd Idn bing Bdn ttong hai tim ~ ^1, 6cm (2)1...