Ahair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Explanation:

First of all, we have to find the power used by the hair dryer, which is given by

where

V = 120 V is the voltage

is the resistance of the hair dryer

Substituting,

Now we can find the total electrical energy used, given by

where P is the power and

t = 2.5 min = 150 s is the time

Substituting,

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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