A balloon in the form of a right circular cone surmounted by a hemisphere, having a diameter equ...
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A balloon in the form of a right circular cone surmounted by a hemisphere, having a diameter equal to the height of the cone, is being inflated by pumping air into it. How fast is its volume changing with respect to its total height \( h \), when \( h=9 \mathrm{~cm} \) ?
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