Для нагревания воды массой 2 кг потребовалось 84 кдж энергии. на сколько при этом изменилась температура воды?

m = 2 кг;

q = 84 кдж = 84000 дж;

c = 4200 дж / (кг * °с);

δt - ?

q = c * m * t;

t = q / (m * c) = 84000 / 8400 = 10 °c

on the 15-th of october, two men tried to get to the top of everest. they made their camp at the bottom of the mountain. they felt very well in it. it was the highest camp on the mountain. the night before the climb, they   drank tea and had supper. they discussed what to take with them to the top. they   decided to leave their sleeping bags and tents behind because the equipment was too heavy.  early in the morning they had breakfast and got dressed. then they started to go up the mountain. it was extremely difficult. the snow was very deep. after a long, hard fight they   reached the top together. they   laughed, shouted and took some photographs.then the sun   disappeared and the two men   realised they were on the top of everest and it was almost night. their camp was too far to each. they went   a little way down the mountain, but there was no moon and it was too dangerous.they had to spend the night on the mountain, at about 10,000 metres, with no tent, sleeping bags or food. they   believed it was  possible. they dug a hole in the snow, and buried themselves. they did not   sleep. it was -30oc. when the light came at last they   began climbing down, and soon they got to their camp. everybody was happy.