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to 
. Calculate:
. The iron piece is then ground for ten minutes with a 200 W grinder. How much does the internal energy of iron increase? The specific heat capacity of iron is 
.
. In doing so, it lengthens by 1.3 mm and pushes away the object lying right next to it with a force of 2000 N. How much has the internal energy of the rod changed? The specific heat capacity of iron is 465 J/kg K.
by supplying heat. The observed substances are iron, water, and air at room temperature. The mass of each substance is equal to 
.
of water is heated from 
to 
.
of water is cooled from room temperature by 
.
of water is heated from 
to 
.
.
of water at 
and 
of water at 
in a thermally insulated container and observe the final temperature at equilibrium to be 
. By how much has the internal energy of the warmer water, colder water, and total internal energy changed?
.
is ground with a grinding machine. After grinding, we measure that the piece has heated up by 
.
?
.
.
.
.
.
.
of heat.
of heat doing a work of 
.
. We add ice to the water, which cools the water by 
.
.
from 
to 
, we need to increase its internal energy by 
. Calculate the specific heat capacity of the iron rod.
is heated up by 
. By how much has its internal energy changed? The specific heat capacity of iron is 
.
grinding machine, the internal energy of a 
iron bar is increased by 
. How long have we been grinding?
of heat is passed to the air. The air in the tube expands and pushes the piston with a force of 
and moves it through a distance 
. By how much has the air's internal energy changed?
is full of water. By how much does the internal energy of the water in the pool change when it is cooled from 
to 
.
and the specific heat capacity of water is 
.
of a substance. If we increase the internal energy of this substance by 
, its temperature increases by 
.
?
of ice at melting point 
is melted. By how much does its entropy increase? The specific latent heat of fusion of ice is 
.
of an iron rod heated from temperature 
to 
change? The specific heat capacity of iron is 
.
, and emits it at a depth where the temperature is 
. What can be the maximum efficiency of the heat engine?
of water at 
and 
of water at 
are placed in a thermally insulated container, by how much does the entropy of the mixture increase when thermal equilibrium is established?
of water at a temperature of 
and 
of ice at the melting point are placed in a thermally insulated vessel. By how much does the entropy of the mixture change when equilibrium is established? The specific latent heat of fusion of ice is 
.
