When the system is in equilibrium, the sum of the moment about a point is
zero.

Reasons:
Length of the beam = l
Mass of the beam = 

Mass of the duck = 
Required:
Force shown by the scale under the right pillar.
Solution:
The location of the duck = On the left end of the beam
When the system is in equilibrium, we have; ∑M = 0
Taking moment about the left pillar, we get;
Clockwise moment = 
Anticlockwise moment = 
At equilibrium, clockwise moment = Anticlockwise moment
Therefore;




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Answer:
If you were to inject air into space what would have happen?
Explanation:
In order for air to defy gravity, it would require atmospheric pressure. But air dosen't defy gravity unless it has the support of atmospheric pressure.
Answer:
The constant torque required to stop the disk is 8.6 N-m in clockwise direction .
Explanation:
Let counterclockwise be positive direction and clockwise be negative direction .
Given
Radius of disk , r = 1.33 m
Mass of disc , m = 70.6 kg
Initial angular velocity , 
Final angular velocity , 
Time taken to stop , t = 2.75 min
Let
be the angular acceleration
We know

=>
=>
Torque required to stop is given by

where moment of inertia ,
=>
Thus the constant torque required to stop the disk is 8.6 N-m in clockwise direction .
R=ut+gt^2/2
r- displacement (height to find)
u - initial speed (zero)
t - time taken
r=0*5.8 + 10*5.8^2 /2 = 168.2 meters