Phai mac cac rong roc dong va rong roc co dinh nhu the nao de voi 1 so it nhat cac rong roc , co the dua 1 vat co trong luong P = 1600N len cao ma chi can 1 luc keo F = 100N . Coi trong luong cua cac rong roc la khong dang ke .

nguoi ta dung palang gom 1 rong roc dong va 1rong roc co dinh de dua mot vat co trong luong la V len cao . hoi luc keo toi thieu

mot vat nang 90kg bi lan xuong ho.neu dung rong roc co dinh thi ta phai dung luc nhu the nao de dua vat len duoc

Giup to voi ki sao thi roi

de dua 1 vat nang co khoi luong 30 kg len tang 2 cua nha ma giam ve luc thi ta dung rong roc gi ? ve hinh minh hoa

de nang mot vat nang 160 tan nguoi ta su dung bao nhieu rong roc co dinh va rong roc dong

so sanh luc , dung de keo len phuong thang dung ,rong roc co dinh ,rong roc dong ,plang

Chon dap an dung:

Dung rong roc dong de keo mot vat co khoi luong 50kg len cao thi chi phai keo mot luc co cuong do la:

A. F=500N

B. F>500N

C. F<500N

D. F=250N

Sap thi ma mu tit the nay...giup minh nhe

dung rong roc dong de keo 1 vat len can bao nhieu N

tai sao khi dung mat phang nghieng don bay hay rong roc de dua vat len cao lai de dang hon khi dung tay keo vat theo phuongthang dung?

Mot nguoi su dung rong roc dong dua khoi be tong 100kg len cao.tinh luc keo toi thieu cua nguoi do khi dua khoi be tong len cao.