The Greeks had a legend that there was an island in the Mediterranean Sea made entirely of lodestone. They used this story as an argument that ships should not be built with iron nails. Because of this legend, why would they not use iron nails? 1. They were expensive. 2. They were rarely found. 3. They were not strong enough. 4. They had strong magnetic attraction.
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Ответ:
In general, the quantity of heat energy, Q, required to raise a mass m kg of a substance with a specific heat capacity of c J/(kg °C), from temperature t1 °C to t2 °C is given by:
Q = mc(t2 – t1) joules
So:
(t2-t1) =Q / mc
As we know:
Q = 500 J
m = 0.4 kg
c = 4180 J/Kg °c
We can take t1 to be 0°c
t2 - 0 = 500 / ( 0.4 * 4180 )
t2 - 0 = 0.30°c