10. Вода объемом 3л налита в сосуд и имеет температуру 20 °С. а) Определите массу воды. (р = 1000 кг/м3)
на
[2]
b) Определите, какое количество теплоты необходимо, чтобы нагреть воду до температуры кип
4200 Дж/(кг °С).
[2]
c) Вычислите, какое количество теплоты необходимо, чтобы воду превратить в пар (r = 2,3-106 Д
[2]
d) Вычислите общее количество теплоты, которое было затрачено.
[1]
m1v1-m2v2=(m2+m1)*v'
2-2*x=6*0.3
2x=2-1.8
2x=0.2
x=0.1. Раз нет минуса, значит, с направлением мы угадали, тело 2 двигалось против оси OX со скоростью 0.1 м/c
ответ:
Импульс тела 1 до столкновения был равен p1=m1v1= 2кг*м/c
Импульс тела 2 до столкновения был равен p2=m2v2=0.2кг*м/c
Импульс тел после столкновения стал равен p'=(m1+m2)*v'= 0.3*6= 1.8 кг*м/c
Вектор скорости тела 2 был антинаправлен вектору скорости тела 1. Тело 2 двигалось со скоростью 0.1 м/c
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