A force of 1.2 N is given to move the trolley at a uniform speed. How much is the frictional force between the wheel and the surface of the table?

i think the answer is terrae but not 100 percent sure. ▓▬▬ §

the answer is c. nacl

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.

answerambulatory;