Answer:
The value is 
Explanation:
From the question we are told that
The length of the bottom of the barge below the water line when loaded is 
The length of the bottom of the barge below the water line when empty is 
Generally the difference in pressure is mathematically represented as

Here
is the density of water with value 

=> 
Explanation:
Power is defined as the work done per unit time or


Answer: The second force applied to the doorknob
Explanation:
The formulae for torque is simple the product of the applied force and the perpendicular distance.
The greater the perpendicular force, the greater the torque assuming a constant value of force.
Applying the force at the doorknob gives for a greater distance between the force and the turning point compared to applying the force at the midpoint of the door ( which is at a shorter distance)
Direction from A to B divided by time(30s)
A
The reason this is is because she the first sentence says that she believed that people would eat the mashed potatoes faster if they were brighter color.