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20. Which of the following is not a requirement of a practical fuel? A. It must contain a large amount of stored energy. B. It must occur in abundance in nature or be easy to produce. C. It must be in the solid state to be used. D. It must be made up of elements that combine easily with oxygen.
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Asked 10/2/2018 7:44:56 AM
Updated 10/2/2018 8:14:36 AM
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User: 20. Which of the following is not a requirement of a practical fuel? A. It must contain a large amount of stored energy. B. It must occur in abundance in nature or be easy to produce. C. It must be in the solid state to be used. D. It must be made up of elements that combine easily with oxygen.

Weegy: It must be in the solid state to be used is not a requirement of a practical fuel.
Expert answered|Score 1|emdjay23|Points 153324|

User: 19. If a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°C, what will be the volume at 50°C? A. 0.000010812 m3 B. 0.002021624 m3 C. 0.004021624 m3 D. 0.002010812 m3

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Asked 10/2/2018 7:44:56 AM
Updated 10/2/2018 8:14:36 AM
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If a certain mass of mercury has a volume of 0.002 m3 at a temperature of 20°C, the volume at 50°C is 0.002010837 m^3. Density of mercury is 13545 kg/m^3 at 20 deg.C ; 13472 kg/m^3 at 50 deg, C ; M = (13545 kg/m^3)*(0.002 m^3) = 27.09 kg ; Let V m^3 = volume at 50 deg. C ; (13472 kg/m^3)*(V m^3) = 27.09 kg ; V = 27.09/13472 = 0.002010837 m^3.
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