Question

A geyser heats water flowing at a rate of 2.0 kg per minute from 30°C to 70°C. If geyser operates on a gas burner, the rate of combustion of fuel will be ____________g min^–1

[Heat of combustion = 8 × 10³ Jg^–1 Specific heat of water = 4.2 Jg^–1 °C^–1 ]

Answer 1

m = 2000 gm/min 

Heat required by water/min = mS∆T 

= (2000) × 4.2 × 40 J/min 

= 336000 J/min

The rate of combustion