A geyser heats water flowing at 4.0 litres per minute from 2 0 ∘ C to 6 0 ∘ C. The heat of combustion of the fuel is 5.0 × 1 0 4 J g − 1 . Find the fuel used per minute in grams (two decimals, c = 4.2 J g − 1 K − 1 ).

Q = 4000 × 4.2 × 40 = 6.72 × 1 0 5 J. Fuel = 5 × 1 0 4 6.72 × 1 0 5 = 13.44 g.

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Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB

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A geyser heats water flowing at 4.0 litres per minute from $2 0^{\circ}$ C to $6 0^{\circ}$ C. The heat of combustion of the fuel is $5.0 \times 1 0^{4}$ J $g^{- 1}$ . Find the fuel used per minute in grams (two decimals, $c = 4.2$ J $g^{- 1}$ $K^{- 1}$ ).

Answer:

13.44

Solution:

$Q = 4000 \times 4.2 \times 40 = 6.72 \times 1 0^{5}$ J. Fuel = $\frac{6.72 \times 1 0 ^{5}}{5 \times 1 0 ^{4}} = 13.44$ g.

Subject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics Laws & Specific Heats of Gases

⏱ 2mℹ️ Source: QB

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