The two blocks in $($Figure $1)$ are connected by a massless rope that passes over a pulley. The pulley is $16$ cm in diameter and has a mass of $2\mathrm{.}8$ kg $.$ As the pulley turns, friction at the axle exerts a torque of magnitude $0\mathrm{.}55$ Nm $.$

Figure $1$ of $1$

Part A

If the blocks are released from rest, how long does it take the $4\mathrm{.}0$ kg block to reach the floor? Express your answer with the appropriate units.

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