Answer:
The force of attraction between the molecules of the same substance
Explanation:
 
        
             
        
        
        
Answer:
We kindly invite you to read carefully the explanation and check the image attached below. 
Explanation:
According to this problem, the rocket is accelerated uniformly due to thrust during 30 seconds and after that is decelerated due to gravity. The velocity as function of initial velocity, acceleration and time is:
 (1)
 (1)
Where:
 - Initial velocity, measured in meters per second.
 - Initial velocity, measured in meters per second.
 - Final velocity, measured in meters per second.
 - Final velocity, measured in meters per second.
 - Acceleration, measured in meters per square second.
 - Acceleration, measured in meters per square second.
 - Initial time, measured in seconds.
 - Initial time, measured in seconds.
 - Final time, measured in seconds.
 - Final time, measured in seconds.
Now we obtain the kinematic equations for thrust and free fall stages:
Thrust ( ,
,  ,
,  ,
,  )
)
 (2)
 (2)
Free fall ( ,
,  ,
,  ,
,  )
)
 (3)
 (3)
Now we created the graph speed-time, which can be seen below.
 
        
             
        
        
        
Answer:
a). 53.75 N and 101.92 N
b). 381.44 N and 723.25 N
Explanation:

a).
ρ ,
,  ,
, 

 
 
 
 
b).
ρ ,
,  ,
, 

 
 
 
 
 
        
             
        
        
        
Answer:
Heliocentrism, a cosmological model in which the Sun is assumed to lie at or near a central point (e.g., of the solar system or of the universe) while the Earth and other bodies revolve around it.
Explanation:
 
        
             
        
        
        
As do pixels create such a defined picture of virtual reality it would be similar to say that such small particles (with understanding and exploring them) would show us how things interact and that basic interaction might show us the result of the creating of something from which we can discover by observing the final result of that partical or even as if looking at a cake- to soon know what it takes to make a cake maybe by it's flavor or how it's not yet known "ingredients" interact with the known ingredients and that interaction shows that ingredients to the cake and the ingredients might as well be the future of that cake