Question

care este puterea unui motor care intr-un interval de timp de 20 minute efectueaza un lucru mecanic de 36 MJ?

Answer 1

$L=36MJ=36*10^6J$

$t=20min=20*60s=1200s$

$P=\frac{L}{t}=0,03*10^6W=\frac{3}{10^2}*10^6W=3*10^4W=30000W$

Answer 2

P=L/t
L=36 MJ=36000000 J
t=20 min=1200 s
P=L/t=36000000/1200=360000/12=30000 W