Предмет: Физика, автор: Ainurchik

Определите время, в течение которого на электроплитке нагревают до кипения воду массой 2 кг. взятую при температуре 20С. Напряжение в сети 220в. сила тока в электроплитке 5А. Уд. теплоемкость 4200

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Ответы

Автор ответа: Марал

52

Дано:

m=2кг

t1=20°C

t2=100°C

U=220В

I=5А

c=4200Дж/кг*°C

t-?

Решение:

Q=UIt

Q=cm(t2-t1)

cm(t2-t1)=UIt

t=cm(t2-t1)/UI=(4200*2(100-20))/220*5=8400*80/1100≈610

ответ:610с

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