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Консультация № 173578
22.10.2009, 22:13
25.00 руб.
0
3
1
Помогите пожалуйста срочно. Буду очень признательна за помощь.
143. На тело, двигавшееся со скоростью 2 м/с, подействовала сила 2 Н в направлении скорости. Через 10 с после начала действия силы кинетическая энергия тела оказалась равной 100 Дж. Найти массу тела, считая его материальной точкой.
143. На тело, двигавшееся со скоростью 2 м/с, подействовала сила 2 Н в направлении скорости. Через 10 с после начала действия силы кинетическая энергия тела оказалась равной 100 Дж. Найти массу тела, считая его материальной точкой.
Обсуждение
22.10.2009, 22:44
общий
это ответ
Здравствуйте, Яна Владимировна.
Выразим скорость через 10 секунд
v=v0+at=v0+Ft/m
Кинетическая энергия W=mv2/2=0,5v02m+v0Ft+0,5F2t2/m=100 Дж
2m+40+200/m=100
m2-30m+100=0
имеем 2 корня
m=15±5[$8730$]5 кг
m1=26,18 кг
m2=3,82 кг
Выразим скорость через 10 секунд
v=v0+at=v0+Ft/m
Кинетическая энергия W=mv2/2=0,5v02m+v0Ft+0,5F2t2/m=100 Дж
2m+40+200/m=100
m2-30m+100=0
имеем 2 корня
m=15±5[$8730$]5 кг
m1=26,18 кг
m2=3,82 кг
5
Неизвестный
23.10.2009, 01:58
общий
Уважаемый Химик. У Вас получилось 2 ответа потому, что Вы не учли знак скорости. В случае с малой массой у Вас знак скорости поменяется.
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