Answer:
1 joule = 0.737 foot-pound
Joule is the unit of work. 
1 J = 1 N·m 
In SI units
1 J = 1 kg· m/s²
0.737 foot-pound is the amount of work to raise 0.737 pounds one foot or raising one pound to 0.737 ft. 
 
        
             
        
        
        
The planet closest to the sun; Mercury.
        
                    
             
        
        
        
Answer:
The semi truck travels at an initial speed of 69.545 meters per second downwards.
Explanation:
In this exercise we see a case of an entirely inellastic collision between the semi truck and the car, which can be described by the following equation derived from Principle of Linear Momentum Conservation: (We assume that velocity oriented northwards is positive)
 (1)
 (1)
Where:
 ,
,  - Masses of the semi truck and the car, measured in kilograms.
 - Masses of the semi truck and the car, measured in kilograms.
 ,
,  - Initial velocities of the semi truck and the car, measured in meters per second.
 - Initial velocities of the semi truck and the car, measured in meters per second.
 - Final speed of the system after collision, measured in meters per second.
 - Final speed of the system after collision, measured in meters per second. 
If we know that  ,
,  ,
,  and
 and  , then the initial velocity of the semi truck is:
, then the initial velocity of the semi truck is:





 
  
The semi truck travels at an initial speed of 69.545 meters per second downwards.
 
        
             
        
        
        
Without a bulb energy cant go through and it would be an open circuit blocking the energy from coming out.