A wooden supply raft is 2m wide, 3m long and 0.200m deep. The raft and its contents have a mass of 700 kg. How many 50 kg crates can be added to the raft before it sinks completely under water?

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system