Answer to Question #134732 in Physics for Akshaya

Question

an empty ballon of mass 17.490 grams is filled with 29.64 litres of helium. what force is necessary to keep the balloon from floating away

Answer 1

$F_{He}=m_{He}\cdot g=\rho_{He}\cdot V_{He}\cdot g=0.18\cdot0.02964\cdot9.81=0.053(N)$

$F_{bal}=m_{bal}\cdot g=0.01749\cdot9.81=0.172(N)$

$F_B=\rho_{air}\cdot V_{air}\cdot g=1.3\cdot0.02964\cdot 9.81=0.378(N)$

$F=F_B-F_{bal}-F_{Hel}=0.378-0.172-0.053=0.153(N)$