2 kg of nitrogen ( c v = 740 , c p = 1040 J k g − 1 K − 1 ) is heated from 2 0 ∘ C to 12 0 ∘ C. Which statements are correct?

Δ T = 100 K. Constant volume: Q = Δ U = 2 × 740 × 100 = 148 kJ, W = 0 . Constant pressure: Q = 2 × 1040 × 100 = 208 kJ, Δ U = 148 kJ (same as before) and W = 208 − 148 = 60 kJ. D confuses Q with Δ U .

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PhysicsHeat & ThermoThermodynamics Laws & Specific Heats of GasesMedium2 minQB

PhysicsMediummultiple choice

2 kg of nitrogen ( $c_{v} = 740$ , $c_{p} = 1040$ J $k g^{- 1}$ $K^{- 1}$ ) is heated from $2 0^{\circ}$ C to $12 0^{\circ}$ C. Which statements are correct?

Options:(select one or more)

Answer:

A, B, C

Solution:

$Δ T = 100$ K. Constant volume: $Q = Δ U = 2 \times 740 \times 100 = 148$ kJ, $W = 0$ . Constant pressure: $Q = 2 \times 1040 \times 100 = 208$ kJ, $Δ U = 148$ kJ (same as before) and $W = 208 - 148 = 60$ kJ. D confuses $Q$ with $Δ U$ .

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

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