CAPE Physics Unit 1 · 2008 (Rest of Region) · Paper 1 · Question Q11

A hot-air balloon moving upwards has a total weight of 200\text{ N} and a volume of 20\text{ m}^3. Assuming the density of the air outside the balloon is 1.2\text{ kg m}^{-3}, the NET upward force on the balloon is then approximately

1. (A)24\text{ N}
2. (B)40\text{ N}
3. (C)176\text{ N}
4. (D)240\text{ N}