An adventurous stdent stands on top of a spinning chair holding a jack-o-lantern in each hand (each of which is 5.0 kg) as she extents her arms horizontally.
she spins around, making one revolution in 2.0 s.
the moment of inertia when her arms are outstretched is 13.0 kgm, and if she brings the jack-o-lanterns in close to her stomach, the moment of inertia drops to 2.6 kgm? .

what is the final angular velocity?

(a) 2.5 rev/s

(b) 2.5 rad/s

(c) 27 rad/s

(d) 0.5 rev/s

(e) 5.0 rev/s

option A

Explanation:

the initial moment of inertia of system , I₀ = 13 kg.m²

the final moment of inertia of the system , I = 2.6 kg.m²

time = t = 2 s

mass = 5 Kg

the initial angular speed ,

ω = 3.14 rad/s

let the final angular speed be ω₀

using conservation of angular momentum

I₀ x ω₀= I x  ω

13 x ω₀= I x  ω

13 x  0.5 = 2.6 x ω

ω = 2.5 rev/s

hence, the correct answer is option A

the answer would be   dignified - apex

get the total number of pieces of fruit and divide it by 4 to get the average. the result is the answer to the problem. 14 total number of fruits and there are 4 members. 14 divided by 4 is equals to 3.5.