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3.34
a)
Body temperature is 37
o
C. From Appendix A.III, ice at 0
o
C has a volume of
0.0010908 m
3
/kg and an enthalpy (and internal energy) of -333.43 kJ/kg. For
water at 35
o
C
= 146.67 kJ/kg and at 40
ˆ
U
o
C
= 167.56 kJ/kg, so that at 37
ˆ
U
o
C
ˆ
U = 155.03 kJ/kg. Also, 1 L = 10
-3
m
3
, so that 1 L of water 10
-3
m
3
/0.0010908
m
3
/kg = 0.9168 kg.
So that the amount of energy needed to melt 1 L of ice is

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