My bathroom mirror is lit by eight 75 watt bulbs. Each bulb consumes 75 watt- hours (Wh) per hour that it is on. The lights are on for approximately 2 hours each day. How many kilowatt-hours (kWh) of energy are consumed by the bathroom lights in 1 year?

The amount of power in kilowatt hour consumed by the the bathroom lights in 1 year is 438,000 kWh

Explanation:

The given parameters are;

The number of bulbs in the bathroom = 8

The power rating of each bulb = 75 W

The number of hours each bulb is lit on daily = 2 hours

The number of days in a year for which the kWh is sought = 365 days

The kilowatt hour consumed by the the bathroom bulb in 1 year = 8 × 75 ×2 × 365 = 438,000 kWh

The kilowatt hour consumed by the the bathroom bulb in 1 year = 438,000 kWh.

ek = (m·v2) / 2

v - velocity of system after the collision

m = m1 + m2

ek = (m1 + m2) ·v2/2

ek = (200 + 250) ·2,32/2 = 450·5,29/2 = 1190,25 j

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explanation:

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