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18 Dec 2019

A room is lighted by four 100 W incandescent lightbulbs. (The power of 100 W is the rate at which a bulb converts electrical energy to heat and the energy of visible light.) Assuming that 86% of the energy is converted to heat, how much heat does the room receive in 4.5 h

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Bunny Greenfelder
Bunny GreenfelderLv2
31 Dec 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

An 11.0-W energy-efficient fluorescent light bulb is designed to produce the same illumination as a conventional 40.0-W incandescent lightbulb. Assuming a cost of $0.110/kWh for energy from the electric company, how much money does the user of the energy-efficient bulb save during 100 h of use? 

1. When a light bulb is rated at 60 W, it means that

A. each second, the bulb converts 60 J of electrical energy to heat and light.

B. the bulb loses 60 W of potential energy each second.

C. current is traveling at 60 m/s through the filament.

D. the bulb uses 60 J of power when it is lit.

 

The molecules of a gas are much farther apart than molecules in a solid or liquid.

True
False

Approximately 5.0% of the electric energy supplied to an incandescent bulb converts into light energy. Assuming the average wavelength of the photons is 5.5x10^-7 m, how many photons are emitted each second by a 40.0 W lightbulb?

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