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A research balloon bound for the stratosphere is filled at sea level with 800 m3 of helium whose initial temperature is 285 K. The balloon is released, and it climbs to an altitude where the air pressure is 0.045 times its sea-level value.

(a) If the helium expands adiabatically, what is the balloon's volume now?

(b) What is the temperature of the helium?

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