Question

Am nevoie urgent de ajutor va rog!​

Answer 1

$\displaystyle\it\\m_1=120g=0,12kg,~m_2=50g=0,05kg.\\miscarea~este~uniforma\implies \boxed{\it a=0m/s^2}.\\a)~m_2a=T-Ff_2 \implies \boxed{\it T=Ff_2=\mu N_2=\mu m_2g\approx0,15N}.\\b)~F-Ff_1-Ff_2=0 \implies \boxed{\it F=Ff_1+Ff_2=\mu m_1g+\mu m_2g\approx0,51N}.\\c)~M=m_1+m_2=0,17kg.\\fie~F'~forta,~F'-Ff=0 \implies F'=Ff=\mu M\cdot N'.\\N'=G_1+G_2=m_1g+m_2g=1,7N.\\atunci,~F'\approx 0,08N.\\\boxed{\it forta~F~se~modifica~deci~cu~\approx 0,43N }.$