Heat Transfer
Heat Transfer
Heat Transfer
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Specific <strong>Heat</strong><br />
<strong>Heat</strong> Gained by Cup = <strong>Heat</strong> Lost by Coffee<br />
m<br />
cup<br />
c<br />
cup<br />
( mc∆T<br />
) ( ) cup<br />
= mc∆T<br />
coffee<br />
( T ) ( )<br />
f<br />
−Ti<br />
= m<br />
cup coffeeccoffee<br />
Tf<br />
−Ti<br />
coffee<br />
( ) ( ) ( ) ( )<br />
cal o o<br />
cal o o<br />
0.056 o × 70 C − 20 C = mcoffee<br />
× 0.98 × 70 C 90 C coffee<br />
500g<br />
×<br />
−<br />
g<br />
C<br />
cup<br />
g<br />
o<br />
C<br />
1400 cal = ×19. 6<br />
m coffee<br />
cal<br />
g<br />
∴m<br />
1400cal<br />
=<br />
19.6<br />
=<br />
71. 4<br />
coffee cal<br />
g<br />
g
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