Question: A 3 0 - cmcm - diameter, 1 . 0 kgkg solid turntable rotates on a 1 . 8 - cmcm - diameter, 4 5

30 -

cmcm

-

diameter,

1.0

kgkg solid turntable rotates on a

1.8 -

cmcm

-

diameter,

450

gg shaft at a constant

33

rpmrpm

.

When you hit the stop switch, a brake pad presses against the shaft and brings the turntable to a halt in

18

seconds.

Part A

How much friction force does the brake pad apply to the shaft?

Express your answer with the appropriate units.

Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the input value typeActivate to select the appropriates symbol from the following choices. Operate up and down arrow for selection and press enter to choose the input value type

fkfk

=

nothingnothing

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