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

Răspuns :

[tex]L=36MJ=36*10^6J[/tex]

[tex]t=20min=20*60s=1200s[/tex]

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

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