Answer: It represents the whole distance traveled. Hope this helps!
Explanation:
 
        
             
        
        
        
Answer:
C. Takes heat in, does work, and loses energy heat. 
Explanation:
Heat engine is a system makes use of thermal energy (heat) to in order to do mechanical work. 
This occurs by converting the heat into mechanical energy. This energy is then used to do work. 
The key characteristic of a heat engine is that the substance with which work is done by, goes from a higher temperature to a lower temperature. 
Hence, it loses heat as it does work. 
 
        
             
        
        
        
Answer:
At some point on say, the receiving screen, light emanating from the left side of the slit will be out of phase (a difference of 1/2 wavelengths) from   light coming from the center of the slit.
Thus for every point that is left of the center of the slit, there will be a point on the right side of the slit that is out of phase,
There will be no light on the screen at that particular point and thus there will be a dark fringe there.
That is the basic explanation for the appearance of dark and bright fringes on the receiving screen.
 
        
             
        
        
        
Answer:
Explanation:
Answer D. Interaction between a pen and paper while you write