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Unit $4...$

RR Ar$...$

Unit $4$

Positiv...

$2$

Mark for Review

$obrace(0)$

A disk of radius $R$ rotates about an axis passing through its center and perpendicular to the plane of the disk. The initial angular speed ${}_i$ is positive, and the disk is given a constant, negative angular acceleration $-{}_0.$ Which of the following expressions correctly represents the magnitude of the net linear acceleration for a point located at the edge of the disk?

$($A$)R{}_0$

$($B$)R({}_i-{}_{0}t{)}^2$

$($C$)$

$R\sqrt[\phantom{2}]{({}_i-{}_{0}t{)}^4-{}_0^2}$

$R\sqrt[\phantom{2}]{({}_i-{}_{0}t{)}^4+{}_0^2}$