Logging Log Lumberjack
 |
Chopped Wood - 24"W x 15"H - Peel and Stick Wall Decal by Wallmonkeys Sale Price: $33.99  |
DescriptionWallMonkeys wall graphics are printed on the highest quality re-positionable, self-adhesive fabric paper. Each order is printed in-house and on-demand. WallMonkeys uses premium materials & state-of-the-art production technologies... |
Logging Log Lumberjack
physics help!?
A lumberjack (mass = 109 kg) is standing at rest on one end of a floating log (mass = 207 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.17 m/s relative to the shore, and then hops onto an identical floating log that is initially at rest. Neglect any friction and resistance between the logs and the water. (a) What is the velocity of the first log (again relative to the shore) just before the lumberjack jumps off? (b) Determine the velocity of the second log (again relative to the shore) if the lumberjack comes to rest relative to the second log.
for the first log
109*2.17+207*v=0
v=-109*2.17/207
the second log
109*2.17=(109+207)*v
solve for v
v=109*2.17/(109+207)
______________-