Answer with Explanation:
We are given that
Mass of person,M=80 kg
Radius,r=3.5 m
Moment of inertia of merry,I=
Angular velocity of platform=
1.Law of conservation of angular momentum

Where
Substitute the values


Angular velocity when the person reaches the edge =0.418 rad/s
2.Rotational kinetic energy of the system before the person's walk

3.Rotational kinetic energy of the system after the person's walk


Answer:
2.36 x 10^6 Hz
Explanation:
We know ;,
Iamp = 1.8mA
L = 0.45mH
VL = 12V
VL = IwL
VL = I x 2π x f x L
f = VL / (I x 2π x L)
f = 12 V/ (1.8mA x 2π x 0.45mH)
f = 12/(1.8x10^-3 x 2π x 0.45 x 10^-3)
f = 2.36 x 10^6 Hz
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