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P. 4385. Water is heated in a thermally insulated container with an immersion heater. During 60% of the heating time the water, initially at a temperature of 19 oC, the water comes to the boil, and then some part of the water is boiled down, 18 g in each minute becomes steam.

a) What per cent of the water boils down?

b) What is the power of the immersion heater in watts?

(4 points)

Deadline expired on 12 December 2011.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. $\displaystyle a)$ A víz 10 százaléka forr el.

$\displaystyle b)$ A forraló kb. 680 wattos.

Statistics on problem P. 4385.
 180 students sent a solution. 4 points: 142 students. 3 points: 15 students. 2 points: 15 students. 1 point: 6 students. 0 point: 2 students.

• Problems in Physics of KöMaL, November 2011

•  Támogatóink: Morgan Stanley