A grinding wheel is a uniform cylinder with a radius of $8\mathrm{.}60cm$

and a mass of $0\mathrm{.}400kg.$

Part A

Calculate its moment of inertia about its center.

Express your answer with the appropriate units.

$I=$

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Part B

Calculate the applied torque needed to accelerate it from rest to $1850rpm$ in $4\mathrm{.}00s$ if it is known to slow down from $1750rpm$ to rest in $52\mathrm{.}0s.$

Express your answer with the appropriate units.