Answer:
the value of x is 3.7 because they are arranged in a particular manner.
Answer:
Part a)

Part b)

Part c)
F = 2.7 N
Explanation:
Part a)
As we know that the rotational kinetic energy of the merry go round is given as


here we know that


Now we have


Part b)
Now we know that work done due to torque = change in kinetic energy




Part c)
In order to stop it in four revolutions we have



F = 2.7 N
There is no relationship whatsoever.