@animal_lover36
Which of the following is not an example of work?

A.
raising a barbell over your head

B.
picking up a box off the floor

C.
holding a tray in the cafeteria line

D.
pushing a box across the floor

Question

@animal_lover36
Which of the following is not an example of work?
  
 
 

 
 

  

  A. 
  raising a barbell over your head   
   

 
 

  

  B. 
  picking up a box off the floor   
   

 
 

  

  C. 
  holding a tray in the cafeteria line   
   

 
 

  

  D. 
  pushing a box across the floor

anonymous · Answer

c. just holding a tray your not doing anything

michele_laino · Answer

I think is C., because there is a force, but there is not a displacement of that force, namely the weight of your tray

anonymous · Answer

C. because you're only standing in one place. no motion, is no work.

emmatassone · Answer

C because $$W=\int\limits_{R _{I}}^{R _{F}}(\sum_{1}^{n}F) . dr$$ since you know Rf=Ri the whole integral is zero. therefore total work is zero too.
$$R_{I}= initialposition$$$$R_f=Final position$$