Answer:
mechanical energy per unit mass is 887.4 J/kg
power generated is 443.7 MW
Explanation:
given data 
average velocity = 3 m/s
rate = 500 m³/s
height h = 90 m
to find out 
total mechanical energy and power generation potential
solution
we know that mechanical energy is sum of potential energy and kinetic energy 
so 
E =  ×m×v² + m×g×h    .............1
×m×v² + m×g×h    .............1
and energy per mass unit is 
E/m =   ×v² + g×h
×v² + g×h
put here value
E/m =   ×3² + 9.81×90
×3² + 9.81×90
E/m = 887.4 J/kg
so mechanical energy per unit mass is 887.4 J/kg
and
power generated is express as 
power generated = energy per unit mass ×rate×density
power generated = 887.4× 500× 1000
power generated = 443700000 
so power generated is 443.7 MW
 
        
             
        
        
        
What's your question? is it seprete questions
        
                    
             
        
        
        
Answer:
You can describe the motion of an object by its position, speed, direction, and acceleration. An object is moving if its position relative to a fixed point is changing. idk if this helps. 
Explanation:  
 
        
                    
             
        
        
        
Answer:four times
Explanation:
Given
mass of both cars A and B are same suppose m 
but velocity of car B is same as of car A 
Suppose velocity of car A is u
Velocity of car B is 2 u
A constant force is applied on both the cars such that they come to rest by travelling certain distance
using  to find the distance traveled
where, v=final velocity
u=initial velocity
a=acceleration(offered by force)
s=displacement
final velocity is zero
For car A 


For car B


divide 1 and 2 we get

thus 
distance traveled by car B is four time of car A
 
        
             
        
        
        
Answer: Your nose inhales O2 and goes through these little nose hairs to keep stuff that doesn't belong in your airway, it goes through your nose into your lungs taking in O2 for your blood. The other substances that you have inhaled get absorbed elsewhere and it is converted into CO2 which is what you exhale. 
Explanation: