Answer:
Part a)

Part b)

Explanation:
As we know that it makes half revolution in given time interval
so we have



now the angular speed is given as



now linear speed is given as


now we have



Now centripetal acceleration is given as



Part b)
Average acceleration of the cat is given as




Answer:

Explanation:
Given:
- moment of inertia of the skater with extended arms,

- moment of inertia of the the skater with pulled-in arms,

- angular velocity of the skater with extended arms,

<u>Using the law of conservation of angular momentum:</u>



Answer:
90 J
Explanation:
W=fd
W=(75)(1.2)
W= 90 J
It means that if the mass of a mass is increased by some factor, and nothing else changes, then the weight of that mass increases by exactly the same factor.