1 o to co khoi luong 1 tan chuyen dong thang deu vou luc keo la 5000N
a) hay xac dinh do lon cua luc ma sat.
b) ke ten cac luc tac dung len o to va bieu dien cac luc theo ty le xich 1 cm ung voi 5000N.
Can gap
1)2 xe o to co khoi luong khac nhau , xe thu nhat co khoi luong 5 tan , xe thu hai co khoi luong hai tan cung chuyen dong thang deu.
a)Cac luc tac dung len moi xe co dac diem gi giong nhau
b)Gia su v1=v2 thi khi gap vat can xe nao co the dung nhanh hon,vi sao
2)keo mot chiec hop go tren ban thong qua luc ke ,ket qua cho thay:
a)khi luc ke chi 10N hop go van dung yen
b)khi luc ke chi 18N hop go chuyen dong thang deu
hay phan tich cac luc tac dung len hop go va bieu dien cac luc do
3)o chan nui , ap ke chi 76cmHg
o dinh nui ,ap ke chi 72cmHg
tinh chieu cao cua ngon nui biet trong luong rieng cua khong khi trong khoang tu chan nui den dinh nui la 13N/m3
co giup toi voi nhe!!!!!!!!!
1 vat hinh hop chu nhat cô kích thước 30.20.10
tinh luc day acsimet tac dung len vat khi tha thang dung o vao trong chat chat long co trong luong rieng la 12000N/m3 biet khi do hieu cao cot chat long cua vat chim trong chat long la 20 cm
1. Mot vat 3km dat tren 1 mat phang ngang S tiep xuc mat san la 100cm .Tinh ap luc va ap suat vat tac dung len mat san .
2. Theo mot vat vao luc ke trong khong khi luc ke chi F=4/4 N .Van treo vat = luc ke nhung nhung chim vat trong nuoc
luc ke F=3,6N.
-XAC DINH trong luong rieng chat lam vat
- CHOBIK d,nuoc = 10000N/m3
AI OI CO THE GIUP MIK K GAP CUC AKKK ~~
Nguoi ta dung 1 rong roc co dinh de keo 1 vat co khoi luong 10kg len cao 15m voi luc keo 120N.
a) Tinh cong cua luc keo
b) Tinh cong hao phi de thang luc can
Nguoi ta dung 1 rong roc co dinh de keo 1 vat co khoi luong 10kg len cao 15m voi luc keo 120N.
a) Tinh cong cua luc keo
b) Tinh cong hao phi de thang luc can
Nguoi ta dung 1 mat phang nghieng co chieu dai 3m de keo 1 vat co khoi luong 300kg voi luc keo 1200N. Hoi vat do co the len cao bao nhieu? Biet hieu suat cua mat phang nghieng la 80%
Người ta muon dua vat len cao 8m bang rong roc dong voi luc keo o dau day tu do la 400N
a) vat co khoi luong bao nhieu
b)quang duong keo day la bao nhieu
c)hoi nguoi do thuc hien cong la bao nhieu
Cau 8:Dung rong roc dong de keo vat nang 200N len cao. Mot nguoi phai keo day di mot doan 8m.
a)tinh luc keo o dau day tu do va do cao vat duoc keo len
b) tinh cong cua luc keo