By definition, the gain in PE (potential energy) is
ΔPE = m*g*h
Given:
mg = 40 N  (Note that m*g = weight)
h = 5 m
ΔPE = (40 N)*(5 m) =200 J
Answer: 200 J
        
                    
             
        
        
        
Answer:
a
   
b
   
 
Explanation:
From the question we are told that 
     The radius of the flywheel is  
       The mass of the flywheel is 
           The rotational speed of the flywheel is 
       The power supplied by the motor is  
           
      Generally the moment of inertia of the flywheel is  mathematically represented as 
        
substituting values 
        
        
The kinetic energy that is been stored is  
        
substituting values 
         
          
 
Generally power is mathematically represented as 
           
=>      
substituting the value 
         
          
 
 
        
             
        
        
        
Answer:
a.) F = 3515 N
b.) F = 140600 N
Explanation: given that the 
Mass M = 74kg
Initial velocity U = 7.6 m/s
Time t = 0.16 s
Force F = change in momentum ÷ time
F = (74×7.6)/0.16
F = 3515 N
b.) If Logan had hit the concrete wall moving at the same speed, his momentum would have been reduced to zero in 0.0080 seconds
Change in momentum = 74×7.6 + 74×7.6
Change in momentum = 562.4 + 562.4 = 1124.8 kgm/s
F = 1124.8/0.0080 = 140600 N
 
        
             
        
        
        
Answer:
Alfred Wegener
Explanation: Continental drift was a theory that explained how continents shift position on Earth's surface. Set forth in 1912 by Alfred Wegener, a geophysicist and meteorologist, continental drift also explained why look-alike animal and plant fossils, and similar rock formations, are found on different continents. Though most of Wegener's observations about fossils and rocks were correct, he was outlandishly wrong on a couple of key points. For instance, Wegener thought the continents might have plowed through the ocean crust like icebreakers smashing through ice.