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Консультация № 196127
14.08.2019, 21:04
0.00 руб.
1
1
1
Здравствуйте! Прошу помощи в следующем вопросе:
Тяга реактивного двигателя F менялась с течением времени t по закону, показанному на рисунке. Какую скорость V сообщил этот двигатель объекту массой m = 120 кг, находящемуся в открытом космосе?
Тяга реактивного двигателя F менялась с течением времени t по закону, показанному на рисунке. Какую скорость V сообщил этот двигатель объекту массой m = 120 кг, находящемуся в открытом космосе?
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Обсуждение
15.08.2019, 07:27
общий
это ответ
Здравствуйте, dar777!
Время работы двигателя разделим на три промежутка:
с; 
с; 
с. Длительности этих промежутков составляют 
(с); 
(с); 
(с). Средние значения силы тяги двигателя за эти промежутки времени составляют 
(Н); 
(Н); 
(Н). Импульсы силы за эти промежутки времени составляют 
(Н*с); 
(Н*с); 
(Н*с). Суммарный импульс силы составляет 
(Н*с). В соответствии со вторым законом Ньютона и формулой (3.2) [1, с. 54], изменение импульса объекта составляет 
а изменение скорости -- 
(м/с).
Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
Время работы двигателя разделим на три промежутка:
с; с; с. Длительности этих промежутков составляют (с); (с); (с). Средние значения силы тяги двигателя за эти промежутки времени составляют (Н); (Н); (Н). Импульсы силы за эти промежутки времени составляют (Н*с); (Н*с); (Н*с). Суммарный импульс силы составляет (Н*с). В соответствии со вторым законом Ньютона и формулой (3.2) [1, с. 54], изменение импульса объекта составляет а изменение скорости -- (м/с).Литература
1. Аксенович Л. А., Ракина Н. Н., Фарино К. С. Физика в средней школе. -- Минск: Адукацыя i выхаванне, 2004. -- 720 с.
5
Это самое лучшее решение!
Об авторе:
Facta loquuntur.
Facta loquuntur.
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