A small block on africtionless, horizontal surface hasa mass of 0.0250 kg. It is attachedto a massless cord passing througha hole in the surface (Fig.).The block is originally revolving ata distance of 0.300 m from the holewith an angular speed of 2.85 rad/s.The cord is then pulled from below,shortening the radius of the circle inwhich the block revolves to 0.150 m.Model the block as a particle. (a) Isthe angular momentum of the block conserved? Why or why not?(b) What is the new angular speed? (c) Find the change in kinetic energyof the block. (d) How much work was done in pulling the cord?
A small block on africtionless, horizontal surface hasa mass of 0.0250 kg. It is attachedto a massless cord passing througha hole in the surface (Fig.).The block is originally revolving ata distance of 0.300 m from the holewith an angular speed of 2.85 rad/s.The cord is then pulled from below,shortening the radius of the circle inwhich the block revolves to 0.150 m.Model the block as a particle. (a) Isthe angular momentum of the block conserved? Why or why not?(b) What is the new angular speed? (c) Find the change in kinetic energyof the block. (d) How much work was done in pulling the cord?
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Question
A small block on a
frictionless, horizontal surface has
a mass of 0.0250 kg. It is attached
to a massless cord passing through
a hole in the surface (Fig.).
The block is originally revolving at
a distance of 0.300 m from the hole
with an angular speed of 2.85 rad/s.
The cord is then pulled from below,
shortening the radius of the circle in
which the block revolves to 0.150 m.
Model the block as a particle. (a) Is
the
(b) What is the new angular speed? (c) Find the change in kinetic energy
of the block. (d) How much work was done in pulling the cord?
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