Question

O MACARA CU PUTEREA MOTORULUI DE 8 KILOVATI RIDICA UNIFORM IN SUS UN CORP CU 12M/MIN. CARE ESTE MASA CORPULUI

Answer 1

macara⇒scripete fix⇒F=R;
R=G;
G=m·g(10N/kg)
P=L/Δt
L=F·d
v=d/t
P=F·d/t⇒P=F·v
v=12m/min⇒v=12m/60s⇒v=0.2
8kW=8000W⇒8000=F·0.2⇒F=8000÷0.2⇒F=40000N
40000N=m·10N/kg⇒m=4000kg=4t