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31. We note from Eq. 1812 that 1 Btu = 252 cal. The heat relates to the power, and to the
temperature change, through
Q = Pt = cm
Δ
T
. Therefore, the time
t
required is
5
(1000cal/ kg C )(40gal)(1000kg / 264gal)(100 F 70 F)(5 C/9 F)
(2.0 10 Btu / h)(252.0 cal/ Btu)(1h / 60min)
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Power, Heat

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