N=<span>10
t=20 сек
</span><span>v-?
</span>T-?
Формулы
T=t/N = 20/<span>10 =2
</span>
v=N/t=<span>10/20=0.5
ответ:</span>T=2 v=0.5
Решение. S=0,5*a*t^2; a=(2*S)/(t^2); e=a/R; w(t)=e*t; an=(w(t)^2)*R; a=100/100=1; e=1/1=1; w(5)=5; an=25*1=25;
4) Q=I*U*t t=Q/(I*U)=800/(3*220)=1.2 c
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5) Io=U/R3=6/2=3 A
R12=R1*R2/(R1+R2)=6*12/(6+12)=4 Ом
U12=Io*R12=3*4=12 B
P2=U12²/R2=12²/12=12 Вт
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6) t=5*60=300 c ΔT=80-20=60° m=1 кг c=4200 Дж/кг*С
P=Q/t=c*m*ΔT/t=4200*1*60/300=840 Вт
======================================
1)R1=pl/s1
R2=pl/s2
R1/R2=s2/s1
R2=3*6:2=9 Ом
2)I=U/R
I=120:80000=0,0015A