English Információ A lap Pontverseny Cikkek Hírek Fórum

Rendelje meg a KöMaL-t!

VersenyVizsga portál

Kísérletek.hu

Matematika oktatási portál

P. 4819. Half a litre of water is boiled by means of an immersion heater, rated at 500 W. How long does it take to increase the temperature of the 0.5 litres of water from $\displaystyle 20~^\circ$C to its boiling point, if the efficiency of heating is 80%? What may the reason be for the 20% loss of energy if the heat released by the immersion heater is totally absorbed by the water?

(3 points)

Deadline expired on 11 April 2016.

Statistics on problem P. 4819.
 101 students sent a solution. 3 points: 68 students. 2 points: 25 students. 1 point: 5 students. 0 point: 2 students. Unfair, not evaluated: 1 solution.

• Problems in Physics of KöMaL, March 2016

•  Támogatóink: Morgan Stanley