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.


Statistics:

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 solutions.

Problems in Physics of KöMaL, December 2005