Предмет: Физика, автор: Kill12you

Срочно помогите за 5 минут пж

ическая печь потребляет ток силой 4.0 А при напряжении 200 В .За какое время после включения печи в ней расплавится 6.0 кг олова, нагретого до температуры плавления. Коэффициент полезного действия печи 75%. Удельная теплота плавления олова я =6.0*10⁴

Приложения:

Ответы

Автор ответа: ninjazhanibek

U=200 В

I=4 А

m=6 кг

η=0.75

λ=60000 Дж/кг

t-?

η=Q/A

η=λm/UIt

t=λm/UIη=(6×60000)÷(0.75×4×200)=600 сек=10 мин

ответ: 10 минут

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: МаЛеНьКаЯ28

помогите пожалуйста поставить слова в скобках в правильной форме ( Герундий или Инфинитив)

Do you think he'll carry on ... (study) after he's finished school ?

Kate refused ... (answer) my question . She just looked at me and shook her hear

If you fancy .. (get) away from it all , why not .. (take) a two-day city break?

O.K. I'll give you a hand . I've got some time ... spare .

If you're not sure how ... (use) a phrasal verb , look it up in the dictionary.

I'll never get used .. (live) in a cold climate.

Young people like ...(feel) that they are independent enough .. (make) their own decisions without ... (consult) their parents .

Jane didn't let her worries ... (interfere) with her work

I'm used .. (get) up early every day so you can ... (count) on me ... (be) there on time .

The cars needs .. (clean) so I'm going to get it done this afternoon.

I saw him .. (put) the file into his briefcase and ... (leave) the office .

He prefers .. (be) on his own now .

You rely on your parents far too much . You'll have .. (start) ... (do) things for yourself - they can't ... (do) everything for you .

Hotel bills have ... (pay) on the day of departure .

The customs officer made me .. (open) my suitcases.

We noticed him .. (enter) the building carrying a huge bag .

I suggest ... (buy) a second-hand car for the time being .

She heard the clock ... (strike) two before she went to bed

2 года назад

Предмет: Английский язык, автор: Яковлевартём

перевести текст. -What must I do now? Am I ready , Mum? -No, you are not.Not yet.Now you must go through security control. -Must I show them my passport ? -No, you need not there,but you must show it to them at passport control.Security must examine your hand baggage for dangerous things.You must not have any liquids or sharp objects in your baggage. -Oh,really.I think I have got a bootle of water in my rucksack.Must I give it you? -Yes,you must.You must not take it with you. -And what about these sandwiches? Must I leave them? -No,you need not.Sandwiches are OK. -And we must say "goodbye" here! We must not cross this line. -OK,then.Now go and be careful.Do not lose your ticket! Do not miss your flight! Do not leave your bag behind! -Have a great time in Russia! -Bye,Mum! Bye,Mark!

2 года назад

Предмет: Русский язык, автор: rega01

1.При какой паре слов буква Е выполняет одинаковую функцию? 1)подъезд,егоза. 2)кедровый,выпьет. 3)моего,метла. 4)осень,хозяева. 2.В каком слове буква Ь пишется по традиции и не связана с обозначением звукового состава слова? 1)акварель 2)воробьи 3)вьюга 4)рисуешь

2 года назад

Предмет: География, автор: Артём1612016

помогите скажите столицу бельгии

9 лет назад

Предмет: Алгебра, автор: Cherry974

Упростите $1) a^{ frac{2}{3} } a^{ -frac{1}{2} } ;<br /> 2) frac{ b^{ frac{1}{2} }* b^{-1} }{ b^{ frac{3}{2} } }$

9 лет назад