Air is pumped into a balloon, of initial volume $V$ , until its diameter has doubled. If the atmospheric pressure is $p$ , what is the work done against the atmosphere ?
Medium
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$V\ \propto \ R^3, R \rightarrow 2R$ then $V \rightarrow 8V$
Work $ = P (8V -V) = 7PV$ [isobaric process]
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