a) According to law of conservation of energy, we can write
Using (1) we get
950×2.5×60=0.258×4200×(100-23)+2300000×m
m=25.7 g
Answer
25.7 g
b)
for microwave:
For kettle:
c)
For kettle:
a scum is generated on the heating element, metal walls of the case
all this increases electricity losses
For microwave:
some of the energy goes to heat the air inside
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