A square wooden raft is floating on a lake. The density of the lake water is $1000\,\text{kg m}^{-3}$. Each side of the raft measures $2.0\,\text{m}$ and the raft has a thickness of $0.20\,\text{m}$. The raft has a mass of $700\,\text{kg}$. How many barrels, each with a mass of $100\,\text{kg}$, can be loaded onto the raft before its top surface drops to the level of the water surface?
- A1
- B7
- C8
- D15