Tim 3 vi du ve moi luc ma sat neu co loi hay co hai bien phap giam luc ma sat va tang luc ma sat

co hai doi keo co hay cho biet:

- luc ma hai doi tac dung len soi day la luc keo hay luc day?

- luc do doi ben trai tac dung len day co phuong va chieu nhu the nao?

- neu soi day dung yen thi luc tac dung cua hai doi len soi day co dac diem gi?

thanh sat va thanh nam cham duoc treo bang day tren cac gia do khi dat gan nhau chung hut nhau . cac luc tac dung len thanh sat duoc bieu dien nhu hinh tren . em hay cho biet co nhung luuc nao tac dung len vat va mo ta cac yeu to cua cac luc nay

de dua mot vat nang 42kg len cao theo phuong thang dung bang rong roc dong nguoi ta phia keo day di mot doan 8m

a. tinh luc keo va do cao nang vat bo qua ma sat

b. tinh cong nang vat

c. do co luc ma sat nen luc keo day la 250N tinh hieu suat cua rong roc va do lon cua luc ma sat sinh ra

Tha mot hon bi sat vao mot binh co the tich 900 cm3 dang chua 0,6dm3 thi thay nuoc dang len den vach 800cm3. Biet khoi luong rieng cua sat la 7800kg/m3 . Tinh khoi luong cua hon bi sat.

( Ban nao biet cau tra loi thi tra loi giup minh nha, minh dang can gap lam. Cac ban viet cu the va chi tiet ra giup minh nha. Minh thanh that cam on may ban nhieu )

viet phan so lon nhat co tong tu so va mau so bang 111

viet phan so be nhat co tong tu so va mau so bang 2010

ban nao tra loi nhanh mik tik chi

cho phan so 232323 phan 121212 va phan so 2323232323phan 1212121212 hoi hai phan so nay co bang nhau khong nho lam loi giai nhe va lam mau len de minh viet minh se tich cho

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