The answer is near the poles.
Answer:
Total angular displacement will be 19.998 radian
Explanation:
It is given that the washer starts from the rest and reach reach the speed of 2 rev/sec in 11 sec
So initial angular velocity 
And final angular velocity 
Time t = 11 sec
So angular acceleration 
So angular displacement in this 11 sec


Now the washer slows down and stops in 9 sec
So final angular velocity = 0 rad/sec
So angular acceleration 
So angular displacement 
So total displacement in 20 sec =
The solution for the acceleration of gravity is given as
This is further explained below.
<h3>What is the
effective value of g, the acceleration of gravity, at 7900 km above the Earth's surface.?</h3>
Generally,
Mass of earth 
Radius of earth 
Gravitational const. 
height 

In conclusion, acceleration due to gravity at this point will be

for 

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The force applied to the object is 5 n