Explanation:
It is known that relation between torque and angular acceleration is as follows.

and, I = 
So, 
= 4 


So, 
= 1 
as 
=
Hence, 

Thus, we can conclude that the new rotation is
times that of the first rotation rate.
Pressing two objects together with more force Increase friction
Use the impulse-momentum theorem.

Substitute your known values:

Hope this helps!