<span>p=F/S</span>
<span>F=pS=pab</span>
S=ab
<span>F=99 750 Па*0,12м*0,2м=2394 Н</span><span> </span><span> </span><span>2,4 кН</span>
По 2 закону Ньютона:
F=ma => a=F/m=4Н/0,5кг=8 м/с²
(p2 - p1)/p1=0.125 по условию
p2/p1=1,125
p1=m/V=m/L³
p2=m2/V2 m2=m/√1-V²/c²
V2=L²*L*√1-V^2/√c^2=L³*√1-V²/c²
p2=m/L³*(1-V²/c²)
p2/p1=c²/(c²-V²)=1,125
c²=1,125*c²-1,125*V²
1,125V²=0.125c²
V=c*√0,125/1.125=0.333*c - ответ