Question

Un caminon cu masa de 15t se misca cu viteza de 36 km/h. Aflati impulsul camionului

Answer 1

Răspuns:

p=15*10^4 (kg*m)/s

Explicație:

masa=15t=15*10^3

viteza= 36km/h= (36*10^3)/36*10^2=10 m/s

p=m*v = 15*10^4(kg*m)/s

Answer 2

$\displaystyle m=15~t,~v=36~\frac{km}{h} \\ \\ 1~t=1000~kg \Rightarrow m=15~t=15 \cdot 1000~kg=15000~kg\\ \\ v=36~\frac{km}{h}=36 \cdot \frac{1000~m}{3600~s} =\frac{36}{3,6}=10~\frac{m}{s}\\ \\ p=mv \Rightarrow p= 15000\cdot 10 \Rightarrow \mathbf{p=150000~\frac{kg \cdot m}{s}}$