contestada

A crane with output power of 200W will lift a 600N object a vertical distance of 4.0 meters in seconds

Respuesta :

Power is calculated by dividing energy with time (J/s) or Watts
In this case, The energy is given by mgh where mg is the weight and h is the vertical height.
Thus, Energy = 600 × 4 = 2400 Joules
 Power = Energy /time
Time will therefore be Energy/power
                                = 2400 J/ 200
                                 = 12 seconds 

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