This preview shows pages 1–3. Sign up to view the full content.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
The magnitude of the average force is 960 N . WebAssign Problem 2: A 55-kg swimmer is standing on a stationary 210-kg .oating raft. The swimmer then runs off the raft horizontally with a velocity of +4.6 m/s relative to the shore. Find the recoil velocity that the raft would have if there were no friction and resistance due to the water. REASONING The sum of the external forces acting on the swimmer/raft system is zero, because the weight of the swimmer and raft is balanced by a corresponding normal force and friction is negligible. The swimmer and raft constitute an isolated system, so the principle of conservation of linear momentum applies. We will use this principle to find the recoil velocity of the raft. SOLUTION As the swimmer runs off the raft, the total linear momentum of the swimmer/raft system is conserved: { s s r r Total momentum Total momentum before swimmer after swimmer starts running runs off raft 0 m v m v + = 14243 where m s and v s are the mass and final velocity of the swimmer, and m r and v r are the mass and final velocity of the raft. Solving for v r gives ( 29 ( 29 s s r r 55 kg 4.6 m/s 1.2 m/s 210 kg m v v m + = - = - = - WebAssign Problem 3: The lead female character in the movie Diamonds Are Forever
This is the end of the preview. Sign up to access the rest of the document.