Can work be done on a system if there is no motion? A) Yes, ...

[dollx]

Can work be done on a system if there is no motion?
 
  A) Yes, since motion is only relative.
  B) Yes, if the sum of the external forces is zero.
  C) Yes, if an external force is acting on the system.
  D) No, since a system which is not moving has no energy.
  E) No, since work involves a non-zero displacement.

Question 2

Dimensional analysis can tell you whether an equation is physically correct.
 
  Indicate whether the statement is true or false

[carlsona147]

Answer to Question 1

E

Answer to Question 2

FALSE

[dollx]

Excellent

[xiaomengxian]

Thanks for the timely response, appreciate it