A small block on a frictionless, horizontal surface has a mass of $2\mathrm{.}30\backslash$times $102$ kg

$.$ It is attached to a massless cord passing through a hole in the surface $($Figure $1).$ The block is originally revolving at a distance of $0\mathrm{.}300$ m

from the hole with an angular speed of $2\mathrm{.}87$ rad$/$s

$.$ The cord is then pulled from below, shortening the radius of the circle in which the block revolves to $0\mathrm{.}150$ m

$.$ Model the block as a particle. Part B

What is the new angular speed?

Express your answer in radians per second.

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$\backslash$omega $2$

$=$

rad$/$s

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Part C

Find the change in kinetic energy of the block.

Express your answer with the appropriate units.

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$\backslash$Delta K

$=$

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Part D

How much work was done in pulling the cord?

Express your answer with the appropriate units.

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W

$=$