The work-energy principle states that an increase in the kinetic energy of a rigid body is caused by an equal amount of positive work done on the body by the resultant force acting on that body. Conversely, a decrease in kinetic energy is caused by an equal amount of negative work done by the resultant force.
 
        
             
        
        
        
Answer:
Acceleration of the ship, 
Explanation:
It is given that,
Mass of both ships, 
Distance between two ships, d = 110 m
The gravitational force between two ships is given by :


F = 8.38 N
Let a is the acceleration. Now, using second law of motion as :



So, the acceleration of either ship due to the gravitational attraction of the other is  . Hence, this is the required solution.
. Hence, this is the required solution.
 
        
             
        
        
        
Answer:
A) 
B) 
C) 
Explanation:
Given:
- mass of flywheel,  
- diameter of flywheel,  
- rotational speed of flywheel,  
- duration for which the power is off,  
- no. of revolutions made during the power is off,  
<u>Using equation of motion:</u>



Negative sign denotes deceleration.
A)
Now using the equation:


 is the angular velocity of the flywheel when the power comes back.
 is the angular velocity of the flywheel when the power comes back.
B)
Here:

Now using the equation:


 is the time after which the flywheel stops.
 is the time after which the flywheel stops.
C)
Using the equation of motion:


 revolutions are made before stopping.
 revolutions are made before stopping.
 
        
             
        
        
        
D. The environment 
Is the right answer