bai1:viet ba tu lay chi hinh dang hoac tinh tinh cua con nguoi:

a) bat dau banh tieng thanh hoi. mau: nho nhan..............................................................

b) bat dau bang tieng co thanh nga. mau: ben len,..........................................................

bai2: trong nhung cau tren, cau co trang ngu tra loi cho cau hoi:

khi nao? Do la cau:.......................................

O dau? Do la cau:.........................................

Vi sao? Do la cau:........................................

De lam gi? Do la cau:....................................

1)Tai sao rot nuoc nong vao thuy tinh day thuong coc de vo hon coc thuy tinh mong? 2) Qua bong ban bi xep khi nhung vao nuoc nong thi lai phong len nhu cu,giai thich? 3)Tai sao o cac duong ray xe lua, cho giao nhau giua cac thanh ray thuong co 1 khe tho ngan ? 4)Neu mot so vi du su no vi nhiet cua chat ran ? 5)So sanh su giong nhau va khac nhau ve su no vi nhiet cua chat ran a)Chat ran va chat long b)chat long va chat khi c)chat ran va chat khi 6)Mot thoi but chi co the tich la 570cm khoi .Tinh khoi luong cua thoi but chi co khoi luong rieng la 11300kg/m khoi ?

CAC BAN DUNG LAI DI CO  DUOC KHONG ? SAO CAC BAN LAI TU HOI TU TRA LOI CHI VI MUON KIEM LIKE CO CHU . SAO CAC CAU PHAI LAM VAY ? CAC CAU LAM NHU VAY THAT BI OI . MINH KHONG MUON XUC PHAM DEN DANH DU CUA CAC CAU NHUNG CAC CAU LAM NHU VAY LA KHONG DUNG . CAC CAU MA DUNG NHUNG TRO BI OI NHU VAY THI NHUGN NGUOI TRA LOI CHAN CHINH CAC CAU HOI SE NHU THE NAO ? CAC CAU HAY DUNG LAI DI . MINH KHONG MUON GAY ROI TREN DIEN DAN VA MINH CUNG BIET CCAC BAN RAT MUON LIKE NHUNG CAC CAU LAM VAY LA LAM VIEC KHONG TOT MINH PHAI NGAN CHUYEN NAY LAI . MONG CAC CAU HIEU 

Giup minh voi a! Lam duoc bai nao thi tra loi giup minh a! Thong cam vi minh khong danh dau duoc

1) Cho khoi luong cua cac nguyen tu sau, tinh khoi luong nguyen tu moi nguyen to theo don vi u

- Nguyen tu Na (38.10^-24g) - Nguyen tu H ( 1,67.10^-24g)

2) Cho biet khoi luong nguyen tu cua: Ca la 40u, N la 14u, Fe la 56u. Tinh khoi luong cac nguyen tu tren theo don vi kg

3) Nguyen tu sat gom 26p, 30n, 26e

a. Tinh khoi luong tuyet doi cua nguyen tu sat theo don vi gam

b. Tinh khoi luong electron co trong 1kg sat

4) Biet rang 1 nguyen tu Fe co 26p, 26e 30n va khoi luong mol nguyen tu cua Fe la 56g/mol

a. Hay cho biet 1 mol Fe co bao nhieu gam electron

b. Tinh so nguyen tu Fe co trong 280g sat

c. Tinh khoi luong electron co trong 280g sat

5) Trong 1,5kg dong co bao nhieu gam electron? Cho biet 1 mol nguyen tu dong co khoi luong bang 63,546 gam, mot nguyen tu dong co 29e

6) Tinh khoi luong cua cac nguyen tu sau theo don vi u va kg: Mangan (25p, 30n) va Kali ( 19p, 20n)

7) Gia su nguyen to co kich thuoc nhu Trai Dat ( co ban kinh khoang 6400km) Hay tinh gan dung ban kinh hat nhan cua nguyen tu do

8) Nguyen tu sat co ban kinh nguyen tu la 1,28 angstron va M= 56u. Tinh khoi luong rieng cua nguyen tu Fe theo g/cm³

9) Nguyen tu kem co ban kinh la 1,35.10^-1nm, co khoi luong cua nguyen tu la 65u

a. Tinh khoi luong rieng cua nguyen tu kem theo g/cm³? Biet V hinh cau =\(\frac{4}{3}.\pi r^3\)

b. Thuc te hau nhu toan bo khoi luong nguyen tu tap trung o hat nhan voi ban kinh = 2.10^-6nm. Tinh khoi luong rieng cua hat nhan nguyen tu kem

10) Khoi luong rieng cua dong la 8,9g/cm³ va nguyen tu khoi cua dong la 64u. Trong tinh the dong thi cac nguyen tu la nhung hinh cau chiem 74% the tich tinh the, phan con lai la cac khe rong. Tinh ban kinh gan dung cua nguyen tu dong

11) Khoi luong rieng cua canxi kim loai la 1,55 g/cm³. Gia thiet rang, trong tinh the canxi cac nguyen tu la nhung hinh cau chiem 74% the tich tinh the, phan con lai la khe rong. Tinh ban kinh nguyen tu canxi tinh theo li thuyet

Treo mot vat ngoai khong khi vao luc ke , luc ke chi 7N . Nhung chim hoan toan vat do vao trong nuoc thi luc ke chi 12N .

a, Tinh luc day Ac-si-met tac dung len vat .

b, Khi vat do nhung chim hoan toan trong dau thi luc ke chi bao nhieu ? Biet trong luong rieng cua dau la 8000N

Bai lam :

a, Luc day Ac-si-met tac dung len vat la :

12-7=5N

b, Luc ke chi la :

P=12 x 8000/10000=9,6N

Vay ..................

M.n coi thu mk lm dung k nha, sai sua lai zum. Mk k co y bao m.n tick dau nha .

(Day la bai thi Vat ly cua lop mk)

trong xa hoi hien tai ngay nay, chung ta van bat gap dau do tieng rao chao moi cua nhung co be, cau be lang thang ban rong tren cac nga duong. the nhung, dap lai deu do la su vo cam, tho o, tham chi xua duoi cua 1 bo phan nguoi dan. em hay viet 1 doan van tu 7 den 10 cau de neu suy nghi ve hien tuong vo cam do.

giup minh lam bai nay voi nha! chu minh ko gioi van cho lam.