Question

a geyser heats water flowing at the rate of 4 litrre per minute from `30^(@) "to" 85^(2) C`. If the geyser operates on a gas burner then the amount of heat used per minute is
A. `9.24xx10^(5)J`
B. `6.24xx10^(7)J`
C. `9.24xx10^(7)J`
D. `6.24xx10^(5)J`

Answer 1

Correct Answer - A
Here k,Volume of wster heated =4 litre `mi n^(-1)` 1 litre =1000g,
then mass of water `=4xx1000g min ^(-1)=4000g mi n^(-1)`
Rise in temperature
`DeltaT=T_(2)-T_(1)=(85-30)^(@)C=55^(@)C`
specific heat of water `S =4.2 J g^(-1)^(@)C^(-1)`
The amount of heat used, `DeltaQ =msDelta`
`=4000xx4.2xx55=924000`
`=9.24xx10^(5) J mi n^(-1)`