Cau 13:

Anhxtanh

a)

1 : Nguyen ly tuong doi

moi Dl vat ly deu nhu nhau trong cac he quay chiue quan tinh

2 : Nguyen ly ve su bat bien cua van toc a/s

Van ntoc a/s chan khong deu bang nhau doi voi moi he quan tinh no' co gia tri bang c =3.10^8 va la gia tri van toc cuc dai trong tu nhien

b)

He thuc anhxtanh

Co' Dong luong =

P= m.v= m.v/(can(1-v^2/c^2))

co' F=dp/dt

theo dinh luat bao toan Nang luong

dW= dA

dW= F.ds=[d(m.vdv/(can(1-v^2/c^2)dt) + mv^2dv/(c^2dt(can(1-v^2/c^2)^3) ]ds

co'dvds/dt = vdv

suy ra dW= mvdv/(c^2(1-v^2/c^2)^(3/2)

suy ra dW=c^2.dm

W=mc^2 +C