Fill in the blanks with the appropriate word: 1. Tom … from the college by five o’clock.
a) had returned b) is returning c) return d) returns
2.You …your friend tomorrow.
a) will meet b) meet c) met d) to meet
3.He …. his car from four till five yesterday.
a) is washing b) were washing c) was washing d) washed
4. Mike … to the sewing factory every day.
a) don’t go b) not go c) go not d) doesn’t go
5.The summer last year … cold.
a) is b) was c) were d) are
6.I … this fashion magazine this week.
a) have seen b) seen c) has seen d) saw
7. The capital of our country … Kiev.
a) be b) is c) are d) am
8. His relatives … in Paris last month.
a) live b) lived c) will live d) lives
9.We … never ... to fashion show in Milan.
a) have … been b) has…been c) to be d) had been
10.They …English now.
ответ: 162,25 кДж
Объяснение:
Q = Q нагревания + Q плавления
Q нагревания = c * m * (t конечная - t начальная)
Q плавления = λ*m
Q = c * m * (t конечная - t начальная) + λ*m
Q = 250 Дж/(кг*°С) * 0,5 кг * ( 960 °С - 10 °С ) + 87 * 10³ Дж/кг * 0,5 кг = 162,25 кДж
ответ: 162,25 кДж теплоты понадобится.
Почему ответы слегка отличаются?
Я взял теплоёмкость серебра, с = 250 Дж/кг*С
Температура плавления t конечная = 960 *С
Удельная теплота плавления = 0,87 * 10^5
Возможно, вы брали другие значения, но их взял из таблиц.