Mathematical and Physical Journal
for High Schools
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Problem P. 3844. (December 2005)

P. 3844. An electric kettle, rated at 6 W, is turned on for 25 minutes and 1.2 l water which was initially at a temperature of 20 oC is heated. Find the final temperature of the water if the efficiency of the process is 0.7.

(3 pont)

Deadline expired on January 11, 2006.


291 students sent a solution.
3 points:227 students.
2 points:36 students.
1 point:9 students.
0 point:17 students.
Unfair, not evaluated:2 solutionss.

Problems in Physics of KöMaL, December 2005