Предмет: Физика, автор: tggggir

ело массой 560 кг из состояния покоя разгоняется до скорости 12 м/с , сила тяги двигателя 3kh . сколько на это потребуется времени

Ответы

Автор ответа: fatt52
0

Ответ:

2.24 c

Объяснение:

m=560 кг   Δv=12 м/с    F=3000 H    Δt=?

===

Изменение импульса:

Δp=m*Δv=F*Δt -----> Δt=m*Δv/F=560*12/3000=2.24 c

=========================================

Автор ответа: zinovicgrigorij
0

Ответ: 2,12с

Объяснение:

Дано:

m=560кг

Vo=0

V=12м/с

F=3кН=3000Н

-------------------

t-?

V=Vo*t+at²/2, где:

Vo-начальная скорость;

t-время движения;

а-ускорение тела

Согласно второго закона Ньютона:

F=ma, где:

F-сила, действующая на тело;

m-масса тела;

a-ускорение тела.

Отсюда:

а=F/m=3000/560=5,36м/с²

Тогда:

t=√(2V/a)=√(2*12/5,36)=2,12с

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