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Уважаемые эксперты, пожалуйста помогите решить задачки. Заранее большое спасибо. C уважение Роман Александрович. Задачи:
1. Тело брошено под углом α = 30° к горизонту со скоростью V0 = 30 м/с. Каковы будут нормальное Аn и тангенциальное А1 ускорение тела через время t = 1c после начала движения?
2. Человек массой M1 = 70 кг., бегущий со скоростью V1 = 9 км/ч , догоняет тележку массой M2 = 190 кг., движущуюся со скоростью V2 = 3,6 км/ч, и вскакивает на неё. С какой скоростью будет двигаться тележка с человеком?
Обсуждение
Неизвестный
07.11.2007, 21:37
общий
это ответ
<font color=red><b>!!!</b></font> Здравствуйте, Чурнов Роман Александрович!
1)g=sqrt(an^2+at^2)
at=(v2-v1)/t
Горизонтальная составляющая скорости пстоянна vp=v1cosa=26m/c
Вертикальная будет равна первоначально vv=vsina=15m/c, через 1 с - vvv=vv-gt=5m/c
Подная кoнечная скрость v=sqrt(vvv^2+vp^2)=26.5v/c
at=(v2-v1)/t=-3.5m/c^2
an=9.3m/c^2
2)По закону сохранения импульса
v1*м1+v2*м2=(m1+m2)*v3
v3=5 km/ч<p><fieldset style=‘background-color:#EFEFEF; width:80%; border:red 1px solid; padding:10px;‘ class=fieldset><font color=red><i>Что за vvv? При чем тут вертикальная и горизонтальная составляющие, если речь идет о нормальном и тангенциальном ускорении?</i> ----- </font><font color=#777777 size=1><b>• Отредактировал: <a href=/info/user/8 target=_blank>Alexandre V. Tchamaev</a></b> (*Мастер-Эксперт) <b>• Дата редактирования:</b> 11.11.2007, 03:52</font></fieldset>
Неизвестный
08.11.2007, 11:34
общий
это ответ
Здравствуйте, Чурнов Роман Александрович!
Полное ускорение равно g. Нормальное ускорение - проекция g на вектор, перпендикулярный скорости. An = g*cos(beta) Тангенциальное ускорение - проекция g на вектор скорости. At = g*sin(beta) Где beta - угол вектора скорости к горизонту. tg(beta) = Vy/Vx. Vx = Vo*cos(α) Vy = Vo*sin(α) - g*t tg(beta) = (Vo*sin(α) - g*t)/(Vo*cos(α)) cos(beta) = 1/sqrt(1 + tg^2(beta)) = 1/sqrt(1 + (Vo*sin(α) - g*t)^2/(Vo*cos(α))^2) = Vo*cos(α)/sqrt((Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2) sin(beta) = tg(beta)*cos(beta) = (Vo*sin(α) - g*t)/sqrt((Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2) An = g*Vo*cos(α)/sqrt((Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2) At = g*(Vo*sin(α) - g*t)/sqrt((Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2) Vo*cos(α) = sqrt(3)/2 = 15*sqrt(3) = 26 Vo*sin(α) - g*t = 15 - 9.8 = 5.2 (Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2 = 225*3 + 25 = 702 sqrt((Vo*cos(α))^2 + (Vo*sin(α) - g*t)^2) = 10*sqrt(7) = 26.5 An = 9.8*26/26.5 = 9.61 м/с^2 At = 9.8*5.2/26.5 = 1.92 м/с^2
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