Question

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×10^{4} hours, on the
average, and costs $12.00, whereas the incandescent bulb costs only
76.0 ¢, but lasts just 750 hours. The study assumed that
electricity cost 9.00 ¢ per kWh and that the bulbs were on for 4.0
h per day.

A.) What is the total cost (including the price of the bulbs) to run incandescent bulbs for 3.0 years?

B.) What is the total cost (including the price of the bulbs) to run compact fluorescent bulbs for 3.0 years?

C.) How much do you save over 3.0 years if you use a compact fluorescent bulb instead of an incandescent bulb?

D.) What is the resistance of a "100 W" fluorescent bulb? (Remember, it actually uses only 23 W of power and operates across 120 V.)

Answer #1

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 76.0 ¢, but
lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 76.0 ¢, but
lasts...

Compact fluorescent bulbs are
much more efficient at producing light than are ordinary
incandescent bulbs. They initially cost much more, but last far
longer and use much less electricity. According to one study of
these bulbs, a compact bulb that produces as much light as a 100 W
incandescent bulb uses only 23.0 W of power. The compact bulb lasts
1.00×104 hours, on
the average, and costs $ 12.0 , whereas the incandescent bulb costs
only 76.0 ¢, but lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on the average, and
costs $ 12.0 , whereas the incandescent bulb costs only 73.0 ¢, but
lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 WW incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 1.00×104 hours, on
average, and costs $ 12.0, whereas the incandescent bulb costs only
75.0 ¢, but lasts just 750...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W W incandescent bulb uses only 23.0 W W of
power. The compact bulb lasts 10000 hours, on the average, and
costs $ $ 11.00, whereas the incandescent bulb costs only $ $...

Compact fluorescent bulbs are much more efficient at
producing light than are ordinary incandescent bulbs. They
initially cost much more, but last far longer and use much less
electricity. According to one study of these bulbs, a compact bulb
that produces as much light as a 100 W incandescent bulb uses only
23.0 W of power. The compact bulb lasts 1.00×104 hours, on the
average, and costs $ 12.0 , whereas the incandescent bulb costs
only 73.0 ¢, but lasts...

Compact fluorescent bulbs are much more efficient at producing
light than are ordinary incandescent bulbs. They initially cost
much more, but last far longer and use much less electricity.
According to one study of these bulbs, a compact bulb that produces
as much light as a 100 W incandescent bulb uses only 23.0 W of
power. The compact bulb lasts 10000 hours, on the average, and
costs $ 11.00, whereas the incandescent bulb costs only $ 0.76, but
lasts just...

It seems hard to justify spending $4.00 for a compact
fluorescent lightbulb when an ordinary incandescent lightbulb costs
50 ¢. To see if this makes sense, compare a 60 W incandescent bulb
lasting 1000 hours to a 15 W compact fluorescent bulb having a
lifetime of 10,000 hours. Both bulbs produce the same amount of
visible light and are interchangeable. If electricity costs
$0.10/kWh,what is the cost - purchase plus energy - to obtain
10,000 hours of light from each...

1. A manufacturer of compact fluorescent light bulbs advertises
that the distribution of the lifespans of these light bulbs is
nearly normal with a mean of 9,000 hours and a standard deviation
of 1,000 hours.
A. What is the probability that a randomly chosen light bulb
lasts more than 10,500 hours?
B. what is the probability that the mean lifespan of 15 randomly
chosen light bulbs is more than 10,500 hours?
c. could you estimate the probability from parts A...

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