Question

Gúp mik vs 

Gấp lắm ạ

 

 

Answer 1

Câu 11.

Thời gian chuyển động hết:

\(t=t_1+t_2=\dfrac{S_1}{v_1}+\dfrac{S_2}{v_2}=\dfrac{120}{6}+\dfrac{120}{12}=20+10=30s\)

Answer 2

Câu 12.

\(F_A=P-F=25-13=12N\)

\(V=\dfrac{F_A}{d}=\dfrac{12}{10000}=1,2\cdot10^{-3}m^3\)

\(d_{vật}=\dfrac{P}{V}=\dfrac{25}{1,2\cdot10^{-3}}=20833,33\)N/m³

Answer 3

Thi tự lm ik bn