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:
the work done is zero.
Explanation:
Given;
applied force, F = 8000 N
time of force application, t = 15 s
Work done is given as the product of force and displacement. Since the car is unable to move, then the displacement is zero and the work done is zero.
Work done = Force x displacement
Work done = 8000 N x 0
Work done = 0
Therefore, the work done is zero.
Explanation:
The intense gravity of the black hole would pull you apart, separating your bones and muscles.