k9i7tsmartmance
k9i7tsmartmance k9i7tsmartmance
  • 25-11-2015
  • Physics
contestada

A 4-watt night light is left on for 8 hours each night. How much work dies it do per night

Respuesta :

AL2006
AL2006 AL2006
  • 25-11-2015

The light bulb doesn't do any "work" ... it doesn't exert force,
or maintain a force through a distance.  It does, however,
dissipate energy, in the form of heat and light.

The quantity of energy that it dissipates is ...

         (4 watts) x (8 hours) x (3600 sec/hour) x (1 joule/watt-sec)

     =  (4 x 8 x 3600) joules  =  115,200 joules .

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