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## Homework Statement

hi everyone,, I need an explanation for this question:

A 1.0 kg block A is hanged by a light string from a pulley of mass

M = 1.0 kg. Another block B of mass 4.0 kg is attached to a mass-less rope wound around a mass-less shaft. The pulley has a radius 260.0 Rcm= and the shaft has a radius. The block B is released from rest when it is at height h = 4.0 m above the ground. 130.0 cm R=

The rotational inertia (moment of inertia) of the pulley with respect to its center of mass is.

I(com)=0.5*M*R2^2

(a) Find the angular acceleration of the pulley.

(b) Find the accelerations of the blocks.

(c) Determine the tensions in the strings.

(d) Find the speeds of the block A and block B just before the block B hits the ground.

## Homework Equations

## The Attempt at a Solution

Actually ,, I have the answer ,, but the problem I don't know how did he get the moment of inertia like that (in the attachment)