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IMSO 2006 Science – Taiwan Selection First Round Theory Question 28

IMSO Science · IMSO 2006 Science – Taiwan Selection First Round Theory

Question 28

A large number of helium balloons are tied to a 0.5 kg (formerly known as a pound) box of chocolates. When the box is released, the balloons rise to the ceiling. While the balloons are at the ceiling, the total force on the balloons is
  1. zero.
  2. equal to the weight of the box of chocolates.
  3. equal to the normal force of the ceiling on the balloons.
  4. equal to the vector sum of the weight of the chocolates, the normal force of the ceiling, the weight of the balloons, and the buoyant force of the air on the box of chocolates.