- #1
DLH112
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Homework Statement
A merry-go-round rotates at the rate of
0.12 rev/s with an 86 kg man standing at
a point 1.4 m from the axis of rotation.
What is the new angular speed when the
man walks to a point 0 m from the center?
Consider the merry-go-round is a solid 45 kg
cylinder of radius of 1.4 m.
Answer in units of rad/s
theres a follow up question:
What is the change in kinetic energy due to
this movement?
Answer in units of J
but don't really worry about that right now.
Homework Equations
v = rw ?
The Attempt at a Solution
Is it just me being dumb or is there a lot of excess information/ kind of a trick question? The angular speed of the merry go round would still be 0.12 rev/sec (need to convert to rad). just the linear velocity changes with the radius... I think? maybe some of that other information has to do with the change in energy question?
I just thought about the follow up question for a minute, maybe I know more than I think, but I'm not confident/have been getting these wrong.
>would you use V= rw to get the linear velocity and then plug that into 1/2mv^2 , and when the radius is 0 the energy goes to 0 since v=rw?