A 65 kg woman stands on the back of a 6.0 m long, 105 kg raft that is floating at rest in still water with no friction. The raft is 0.50 m from a fixed pier.
(a) The woman walks to the front of the raft and stops. How far is the raft from the pier now?
(b) While the woman walks, she maintains a constant speed of 3.0 m/s relative to the raft. Find the total kinetic energy of the system (woman plus raft) Find the total kinetic energy of the system if the woman walked at 3.0 m/s on a raft tied to the pier. (Make a mental comparison of these two values.)
(c) Where does this energy come from, and where does it go when the woman stops at the front of the raft? (Select all that apply.)
- comes from chemical energy of the woman
- comes from internaenergy of the raft
- comes from gravityl
- comes from buoyancy
- goes to internal energy of the raft
- goes to internal energy of the woman