De thi hoc ki vat li 2010-2011 Thoi gian 45’ +Cau1a,:ap suat la gi?viet cong thuc tinh va neu ten,don vi tung dai luong co trong cong thuc? B,ap suat chat long phu thuoc vao nhung yeu to nao? +Cau2:Luc ma sat co loi hay co hai?neu vi du minh hoa +Cau3 :Phat bieu dinh luat ve cong. +Cau4 :Mot dau tau khoi luong 100 tan chay trong 10 gio .Trong 4 gio dau tau chay voi van toc trung binh 60km /h.Trong 6 gio tiep theo tau chay voi van toc 50km/h. A,tinh van toc trung binh cua tau khi chuyen dong B,bieu dien cac luc tac dung lendau tau bang vec-to khi tau dang chuyen dong thang deu tren duong nam ngang. C,tinh luc keo cua dau tautheo phuong nam ngang luc dau tau dang chay thang deu.Biet luc can len dau tau bang 0,15trong luong cua tau. . De thi hoc ki vat li 2 010 -2 011 Thoi gian 45’ +Cau1a,:ap suat la gi?viet cong thuc tinh va neu ten,don. +Cau3 :Phat bieu dinh luat ve cong. +Cau4 :Mot dau tau khoi luong 10 0 tan chay trong 10 gio .Trong 4 gio dau tau chay voi van toc trung binh 60km /h.Trong