Aclassroom has 24 fluorescent bulbs, each of which is 32 w. how much energy does it take to light the room for a minute? (unit=j)

Energy= 46.08KJ

Explanation:

Given that the power needed to light each bulb is 32W

We know that Power =

The energy needed to light one bulb=

Given time = 1minute = 60 seconds

Energy = =1920J

Therefore energy needed to light one bulb is 1920J

The energy needed to light 24 bulbs = =46080J=46.08KJ

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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