vat li co may cong thuc ,neu nhung cong thuc do
vat li co may cong thuc ,neu nhung cong thuc do
co 8 vien bi trong do co mot vien nang hon bang sat hoi so lan can toi thieu can thuc hien neu ro cach tim ra vien bi bang sat
viet cong thuc tinh D bang m va Vf
a ) khi treo vat nang vao 1 soi day vat nang dung yen tai sao ? khi do co nhung luc nao tac dung vao vat nang ?
b) soi day bi dut co hien tuong gi xay ra voi vat nang ? tai sao ?
dai luong vat ly, ki hieu, cong dung cua vat ly 6 la gi
mot coc dung day nuoc co khoi luong tong cong la 260g.Nguoi ta tha vao coc mot vien soi co khoi luong 28,8g.Sau do dem can thi thay tong khoi luong la 276,8g.Tinh khoi luong rieng cua hon soi biet khoi luong rieng cua noc la 1g/cm3
Cau 1 : Dat quyen sach len ban . Co nhung luc nao tac dung len no ?
Cau 2 : Co 3 qua can , nang lan luot la 50g , 30g , 100g o ben nay . Co 3 goi keo o ben kia . Tinh can nang 1 goi keo ?
Cau 3 : Cho truoc mot cai dia , mot binh chia do , mot cai bat va mot hon da , hon da do ko lot vua binh chia do . Hay neu cac buoc de do the tich hon da
doc thong tin trong khung duoi day chi ra nhung diem giong hoac khac
luc ma sat co the co ich co the co hai . co 1 so bien phap lam giam ma sat co hai
chuyen ma sat truot thanh ma sat lan
su dung cac chat boi tron nhu dau mo hay bot than chi o giua cac be mat tiep xuc cua 2 vat ran