ch14-p080 - 80. The downward force on the balloon is mg and...

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80. The downward force on the balloon is mg and the upward force is F b = ρ out Vg . Newton’s second law (with m = in V ) leads to out out in in in 1. Vg Vg Va g a ρρ §· −= ¡ ¨¸ ©¹ The problem specifies out / in = 1.39 (the outside air is cooler and thus more dense than
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