dude thx for the points lol
 
        
                    
             
        
        
        
Answer:
Explanation:
load = 4500lb                   lift height= 30 ft
time =15 s
velocity= ft/s
 ft/s
velocity=2 ft/s
power = force velocity
 velocity
power=
power= 9000 lb ft/s
1 hp= 550 lb ft/s
power=  hp
 hp
 
        
             
        
        
        
Answer:
   Engineers can design a train with a regenerative braking system
Explanation:
Assuming the point of the question is that the engineers want to focus on using energy efficiently when starting and stopping, they would likely want to consider a regenerative braking system. Such a system can store energy during braking so that it can be used during starting, reducing the amount of energy that must be supplied by an outside power source.
 
        
             
        
        
        
Answer:
<u><em>note:</em></u>
<u><em>solution is attached in word form due to error in mathematical equation. furthermore i also attach Screenshot of solution in word due to different version of MS Office please find the attachment</em></u>
 
        
             
        
        
        
Answer:
Bending stress at point 3.96 is \sigma_b = 1.37 psi
Explanation:
Given data:
Bending Moment M is 4.176 ft-lb = 50.12 in- lb
moment of inertia I = 144 inc^4
y = 3.96 in

 putting all value to get bending stress 
 
  

 
Bending stress at point 3.96 is  = 1.37 psi
 = 1.37 psi