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• From Physics: General-Physics
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• Due on Feb. 22, 2012
• Asked on Feb. 22, 2012 at 07:06:06AM

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Q:
The law of conservation of energy is a statement that

A) energy must be conserved and you are breaking a law if you waste energy
B) the supply of energy is limited so we must conserve it
C) the total amount of energy is constant
D) energy cannot be used faster than it is created

A light bulb rated at 100 W does not mention a time factor because the time is

A) not used in power ratings of light bulbs
B) already included in the definition of a watt
C) considered in energy consideration other than light bulbs.
D) not important because bulbs always use the same amount of energy

Which of the following requires the most land area to satisfy the energy requirements of a medium size city?

A) Growing crops for conversion to fuel
B) Solar collectors
C) Wind turbines
D) Nuclear power

Geothermal energy
A) is an ancient technology that has fallen out of favor in recent years
B) is currently used in several dozen countries and accounts for nearly 4% of the world's energy production
C) cannot be applied in regions, such as Iceland, near tectonic plate boundaries because the underground temperature increase is too high and pipes set in the bedrock tend to buckle and melt.
D) is based on the principle that temperature increases with depth below Earth's surface, and furthermore, in some areas naturally occurring hot water can be extracted as an energy source.

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Preview: ... energy is constant ;Q2) B) already included in the definition of a watt ...

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Preview: ... of time, P = W/t so 100 watts means 100 joules per second. Thus time is already in the definition of a watt. 3) (A) Growing crops f ...

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Preview: ... you waste energy B) the supply of energy is limited so we must conserve it C) the total amount of energy is constant D) energy cannot be used faster than it is created 2. A light bulb rated at 100 W does not mention a time factor because the time is A) not used in power ra ...

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Preview: ... satisfy the energy requirements of a medium size city? A) Growing crops for conversion to fuel B) Solar collectors C) Wind turbines D) Nuclear power Geothermal energy A) is an ancient technology that has fallen out of favor in recent years B) is currently used in several dozen ...

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