2. Consider the system shown below at a single instant in time.

a. Find the general expression for the total angular acceleration a of the disk for the instant shown.

b. If all the rotation rates are constant, @= @= @=0, and ₂ = 0, find the overall acceleration

of the point D on the rim of the rotating disk for the instant shown.

AM

X

0.5 m

Figure for Problem 2

0.25 m

(9)

0.2 m Diameter Disk