Răspuns :
1 / energia cinetica nu variaza , ea depinde de m si v , iaracestea sunt constante pe parcursul deplasarii
2.energia potentiala gravitationala se mareste ea depinde de m , g si h , inaltimea fata de pamant .
3 t=2min =120s,L=2400J, P=L/t=20W
4.t=5*60=300s, L=mgh=3000*10*5=150000J,P=L/t=500W
5.F=245000N,P=3000000W,d=30000m,
P=L/t=Fd/t, t=Fd/P=2450s
2.energia potentiala gravitationala se mareste ea depinde de m , g si h , inaltimea fata de pamant .
3 t=2min =120s,L=2400J, P=L/t=20W
4.t=5*60=300s, L=mgh=3000*10*5=150000J,P=L/t=500W
5.F=245000N,P=3000000W,d=30000m,
P=L/t=Fd/t, t=Fd/P=2450s
1 c
2 a
3 a
4 P=L/t=m*g*h/t =3000*10*5/(5*60)=500W
5 E=P*t E=F*d => P*t=F*d => t=F*d/P=245.000*30.000/3.000.000
t=7350s=122m30s=2h2m30s
6 altfel tractorul nu ar putea inainta (merge)
7 cand inaltimile lor sunt invers proportionale cu masele lor
Ep1=Ep2 m1*g*h1=m2*g*h2 m1*h1=m2*h2 => h1/h2=m2/m1
2 a
3 a
4 P=L/t=m*g*h/t =3000*10*5/(5*60)=500W
5 E=P*t E=F*d => P*t=F*d => t=F*d/P=245.000*30.000/3.000.000
t=7350s=122m30s=2h2m30s
6 altfel tractorul nu ar putea inainta (merge)
7 cand inaltimile lor sunt invers proportionale cu masele lor
Ep1=Ep2 m1*g*h1=m2*g*h2 m1*h1=m2*h2 => h1/h2=m2/m1