<span>дано:<span> </span></span>
<span>c</span><span>=2100Дж</span><span>/</span><span>кг*К</span>
<span> m</span><span>=40кг<span> </span></span>
<span> </span><span>Q</span><span>=400</span><span>K</span><span>Дж<span> =400000 </span></span><span>Дж</span>
<span> </span><span>(</span><span>t</span><span>2-t1)-?<span> </span></span>
<span> </span>
<span> </span><span>Q</span><span>= </span><span>cm</span><span>(</span><span>t</span><span>2-t1)</span>
<span>(</span><span>t</span><span>2-t1)=Q/cm</span>
<span><span> </span></span>
<span>(</span><span>t</span><span>2-t1)</span><span>=40000Дж /2100Дж</span><span>/</span><span>(кг*К)*40</span><span>кг</span><span>=</span>
<span><span> </span></span><span>=4,7’C</span>
<span><span> </span>Температура </span><span>изменится на 4,7</span><span>’C</span>