Physics - Heat & Thermo Question with Solution | TestHub

PhysicsHeat & ThermoThermodynamicsMedium2 minQB

PhysicsMediumsingle choice

Consider two situations:

I. You are rapidly pumping air into a tire with a bicycle pump.

II. Helium gas is rapidly escaping out of a balloon.

Which of the following statements is true?

Answer:

Solution:

Rapid processes are adiabatic. Pumping is compression: $Δ W$ by the gas is negative, so $Δ U = - Δ W > 0$ - the pump warms up.

Escaping helium expands: $Δ W$ positive, so $Δ U = - Δ W < 0$ - the helium cools down.

Stream:JEESubject:PhysicsTopic:Heat & ThermoSubtopic:Thermodynamics

⏱ 2mℹ️ Source: QB

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