A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a

Question

A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3 kg weight is hanging on the string. The system of the weight and disk is released from rest.

1)When the 3 kg weight is moving with a speed of 2.1 m/s, what is the kinetic energy of the entire system?    

K.E. =  23,1525 (I got this part but stuc on the rest.)

2)

If the system started from rest, how far has the weight fallen?

h fall =

3)

What is the angular acceleration at this point?

? =

A 15 kg uniform disk of radius R = 0.25 m has a string wrapped around it, and a m = 3 kg weight is hanging on the string. The system of the weight and disk is released from rest. When the 3 kg weight is moving with a speed of 2.1 m/s, what is the kinetic energy of the entire system? K.E. = 23,1525 (I got this part but stuc on the rest.) If the system started from rest, how far has the weight fallen? h fall = What is the angular acceleration at this point? ? =

Explanation / Answer

Using a freebody diagram and the relationship
a = ?*r, we come to

a = Tr

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