A weightlifter is trying to carry a 10 kg weight held over his head across the room. How much energy will be required to do this work on the 10 kg weight?
physics - Andrew, Monday, May 7, 2012 at 10:16pm
No energy will be required, as no work is being done one the weight as it is carried across the room.
Wnc = Fdcos90
cos90 = 0
Wnc = 0
Wnc = change in Emech
change in Emech = 0