- #1
Bones
- 108
- 0
Homework Statement
A 4.00 kg mass and a 3.00 kg mass are attached to opposite ends of a thin 44 cm long horizontal rod (see figure). The system is rotating at angular speed ω = 6 rad/s about a vertical axle at the center of the rod.
(a) Determine the kinetic energy K of the system.
(b) Determine the net force on each mass.
(c) Repeat parts (a) and (b) assuming that the axle passes through the CM of the system.
Homework Equations
The Attempt at a Solution
KE=1/2(0.3388m*N)(6rad/s)^2=6.10 J
F1=(4kg)(6rad/s)^2(0.22m)=31.7 N
F2=(3kg)(6rad/s)^2(0.22m)=23.8 N
CM=(4kg)(0.22m)+(3kg)(0.22m)/4kg+3kg=0.22m
How does the CM change the problem? I am having trouble figuring out the second set of answers.