We have to speed up the watch so we need to decrease time period of pendulum. So we hv to reduce the length.
Answer:
The new angular speed is
Explanation:
From the question we are told that
The angular velocity of the spin is
The original moment of inertia is
The new moment of inertia is
Generally angular momentum is mathematically represented as
Now according to the law of conservation of momentum, the initial momentum is equal to the final momentum hence the angular momentum is constant so
=>
where w is the new angular speed
So
=>
=>
The 5th blank line is plants and the 6th blank line is environment. The rest I don't know either.