Дано:V=5л=0,005 м³
q=4,6*10⁷ Дж/кг
ρ=710 кг/м³
Найти: Q
Q=m*q, m=ρ*V, Q=ρ*V* q
Q=710 *0,005*4,6*10⁷= 16,33*10⁷ Дж= 163,3*10⁶Дж=163 МДж
Касательное ускорение точки на колесе можно найти по формуле:
ат=Е·R (1)
Нормальное ускорение точки можно записать:
ан=w^2·R, где омега w- угловая скорость колеса, при постоянном угловом ускорении равна w=Et.
Полное ускорение точки на колесе:
а^2=ат^2+ан^2=(ЕR)^2+((Et)^2·R)^2=R^2·E^2·(1+E^2·t^4).
Отсюда радиус R= корень(а^2/(Е^2·(1+Е^2·t^4)))= корень(7,5^2/(9(1+9)))= корень(15·15/(4·9·10))= корень(5/8) м=0,791 м.
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Электроемкости равны, так как в формуле не используются величины, которые не зависят от удельного сопротивления...
С= 4πεε₀r
Радиусы шаров равны.