15000Вт*80%\100%= 12000Вт (полезное)
12000Вт\5000кг= 2,4 м/с
1.
R = 50 см = 0,5 м
t = 3,14 c
![v-?](https://tex.z-dn.net/?f=v-%3F)
![v= \frac{2 \pi R}{T}](https://tex.z-dn.net/?f=v%3D+%5Cfrac%7B2+%5Cpi+R%7D%7BT%7D+)
,
![T=2t](https://tex.z-dn.net/?f=T%3D2t)
![v= \frac{ \pi R}{t}](https://tex.z-dn.net/?f=v%3D+%5Cfrac%7B+%5Cpi+R%7D%7Bt%7D+)
![v= \frac{3,14*0,5}{3,14} =0,5](https://tex.z-dn.net/?f=v%3D+%5Cfrac%7B3%2C14%2A0%2C5%7D%7B3%2C14%7D+%3D0%2C5)
м/с
2.
R = 2 м
![v=0,5](https://tex.z-dn.net/?f=v%3D0%2C5)
м/с
ω - ?
![v= \frac{ \pi R}{t}](https://tex.z-dn.net/?f=v%3D+%5Cfrac%7B+%5Cpi+R%7D%7Bt%7D+)
,
![T= \frac{2 \pi R}{v}](https://tex.z-dn.net/?f=T%3D+%5Cfrac%7B2+%5Cpi+R%7D%7Bv%7D+)
ω =
ω =
ω =
![\frac{0,5}{2}=0,25](https://tex.z-dn.net/?f=+%5Cfrac%7B0%2C5%7D%7B2%7D%3D0%2C25+)
(рад/с)
3.
ω = 0,25 рад/с
t = 1 мин = 60 с
ν - ?
ω = 2πν
ν = ω/2π
ν = 0,25/2*3,14=3,98 об/с = 239 об/мин
4.
ν = 239 об/мин
R = 2 м
![v-?](https://tex.z-dn.net/?f=v-%3F)
![v= \frac{2 \pi R}{T}](https://tex.z-dn.net/?f=v%3D+%5Cfrac%7B2+%5Cpi+R%7D%7BT%7D+)
, T = 1/ν
![v=2 \pi R](https://tex.z-dn.net/?f=v%3D2+%5Cpi+R)
ν
![v=2*3,14*2*239=3002](https://tex.z-dn.net/?f=v%3D2%2A3%2C14%2A2%2A239%3D3002+)
м/мин
1) 35 см, 350 мм
2) 120мм^2; 0.0012 м^2
3) 80000 см^3; 0.0008 м^3
M1V1+m2V2=(m1+m2)*0
400*3=600*x
<span>x=2</span>
R1=20 Ом, I1=0,5 А, I2=<span>0,9 А, U2=3.6 В. r-? </span><span>E= I1(R1+r), E= I2(R2+r) = I2R2+ I2r = U2+I2r. I1(R1+r) =U2+I2r. I1R1+I1r=U2+I2r. I1r -I2r =U2-I1R1. r=(U2-I1R1)/(I1-I2)= (3,6-10)/(-0,4)= 16 Ом.
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