Answer:
(a). The kinetic energy stored in  the fly wheel is 46.88 MJ.
(b). The time is 1.163 hours.
Explanation:
Given that,
Radius = 1.50 m
Mass = 475 kg
Power 
Rotational speed = 4000 rev/min
We need to calculate the moment of inertia
Using formula of moment of inertia

Put the value into the formula


(a). We need to calculate the kinetic energy stored in  the fly wheel
Using formula of K.E

Put the value into the formula




(b). We need to calculate the length of time the car could run before the flywheel  would have to be brought backup to speed
Using formula of time



Hence, (a). The kinetic energy stored in  the fly wheel is 46.88 MJ.
(b). The time is 1.163 hours.
 
        
             
        
        
        
Answer:
The magnitude of the angular acceleration is  
Explanation:
From the question we are told that 
    The angular speed of CD is  
     time taken to decelerate is 
     The final angular speed is  
 The angular acceleration is mathematically represented as
          
substituting values 
           
          
The negative sign show that the CD is decelerating  but the magnitude is 
        
     
 
        
             
        
        
        
Answer:
The population of the mice will decrease to the faster, stronger, and smarter mice because the weaker will die because of natural selection.
Explanation:
 
        
             
        
        
        
<u>Given that:</u>
 Ball dropped from a bridge at the rate of 3 seconds
Determine the height of fall (S) = ?
       As we know that, S = ut + 1/2 ×a.t²
                           u =initial velocity = 0 
                           a= g =9.81 m/s  (since free fall)
                             S = 0+ 1/2 × 9.81 × 3²
                           <em> S = 44.145 m</em>
<em>44.145 m far is the bridge from water</em>
 
        
             
        
        
        
Answer:
 Einstein extended the rules of Newton for high speeds. For applications of mechanics at low speeds, Newtonian ideas are almost equal to reality. That is the reason we use Newtonian mechanics in practice at low speeds.
Explanation:
<em>But on a conceptual level, Einstein did prove Newtonian ideas quite wrong in some cases, e.g. the relativity of simultaneity. But again, in calculations, Newtonian ideas give pretty close to correct answer in low-speed regimes. So, the numerical validity of Newtonian laws in those regimes is something that no one can ever prove completely wrong - because they have been proven correct experimentally to a good approximation.</em>