По закону сохранения энергии: q1=q2 q1 - вода остывает q2 - нафталин плавится с*m1*(t1-t) = m2*(лямбда) с - удельная теплоемкость воды m1 - масса воды t1 = 95градусов цельсия t = 80 градусов цельсия m2 - масса нафталина (лябда) - удельная теплота плавления нафталина значит: m2=(с*m1*(t1-t)) / (лямбда) m2=(4200*0,5*15) / 150000=0,21кг=210гр ответ: 210гр кстати, лямбда равна не 150 дж/кг, а 150 кдж/кг = 150000 дж/кг
Преобразуйте предложения в косвенную речь.
1. “We live in a big city,’ they say.
2. “I am going to the market now,” Brian told her.
3. “I’ve found my passport,” Betty said
4. “I don’t like fish,” Ms Ford says.
5. Tom said: “I will help your sister.”
6. The dentist told me: “Don’t eat sweets anymore.”
7. The teacher said: “Keep the silence, please.”
8. John asked, “Have you seen the film?”
9. Tom asked, “Are you listening to music now?”
10. I asked, “Has she been working hard on this problem?”
11. She asked, “Was Nick in the library yesterday?”
12. He asked, “Does she work now?”
13. He asks, “Have you been reading this book since Friday?”
14. Jane asked, “Can anybody help me?”
15. He asked, “Will you be at Carol’s party tonight?”
16. “What have you bought me for Christmas?” the little boy asked his parents.
17. Helen said, “I cannot call you, I’ve lost your phone number”.
18. “Let’s go to a movie,” I said.
19. ‘’Why are you looking pale? What’s the matter?’’ asked Mother.
20. Ann asks Nina, “Where do you live?”