F=10^-6 H E=100 Н/Кл e=1.6*10^-19 Кл q=? n=?
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q=F/E=10^-6/100=10^-8 Кл
n=q/e=10^-8/(1.6*10^-19)=6.25*10^10 штук
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P=mg
P= 70кг*10м/с^2 = 700H
200=x2-900/2*0,56 ,будит 148
m1=2кг
m2=4кг,
V1=1м/с
<span> </span>V2=5м/с.
<span><span> </span><span>m1+m2=(m1+m2)V’</span></span>
<span>V</span>’= <span>m</span>1<span>V</span>1+<span>m</span>2<span>V</span>2/ <span>m</span>1+<span>m</span>2=2*1+4*5/2+4=2+20/6=22/6=3.6 м/<span>c</span>
К (энергия до)= <span>m</span>1<span>V</span>1^2/2+<span>m</span>2<span>V</span>2^2/2=2*1^2/2+4*5^2/2=3/2+29/2=32/2=16
К (энергия после)= (<span>m</span>1+<span>m</span>2)*( <span>V</span>’)^2/2=(2+4)*(3.6)^2/2=6*12.96/2=38.88
Vо=18км/ч=5 м/с a=(V-Vo)/t=0-5/10=-0.5[м/с]
V=0 м/с
t=10c
a=?