C . plate a is negatively charged and plate b is positively charged
        
                    
             
        
        
        
Answer:
9000 kg/m³
Explanation:
Density is mass per volume.
D = M / V
D = (9.00 kg) / (0.100 m × 0.100 m × 0.100 m)
D = 9000 kg/m³
 
        
             
        
        
        
Answer:
Almost all machines require energy to offset the effects of gravity, friction, and air/wind resistance. Thus, no machine can continually operate at 100 percent efficiency.
 
        
             
        
        
        
Answer:
2.6h
Explanation:
I attached the image below of the work hope you can see it. Hope this helps!
 
        
             
        
        
        
That's unaccelerated motion,
and constant velocity.