Homework Help: Physics

Posted by Brian on Saturday, December 15, 2012 at 10:42pm.

A 5.00-grain aspirin tablet has a mass of 320 mg. For how many kilometers would the energy equivalent of this mass power an automobile? Assume 12.75 km/L and a heat of combustion of 3.65x10^7 J/L for the gasoline used in the automobile.

Physics - Elena, Sunday, December 16, 2012 at 11:10am
E=mc²=320•10⁻⁶•9•10¹⁶=2.88•10¹³ J
E/3.65•10⁷=2.88•10¹³ /3.65•10⁷=7.9•10⁵ L
7.9•10⁵•12.75=1•10⁷ km
Physics - Brian, Sunday, December 16, 2012 at 5:05pm
Thank you!

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