Question

A 1500 w electrical heater is used to heat 20 kg of water (c p = 4186 j/kg k) in an insulated bucket, from a temperature of 30c to 80c. If the heater temperature is only infinitesimally larger than the water temperature during the process, the change in entropy for heater is.. J/k and for water ............. J/k

Answer 1

Explanation:

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Answer 2

Answer:

- 12787 J/k

Explanation:

infinitesimally larger means  water is heated in infinite steps indirectlypoint that process is reversible i.e (ds)=0

ds for finte temp is given as

ds=Cln(t2/t1)

We know (ds)universe =0 = (ds)heater+(ds)water

ds)herter= -(ds)water