aaronb
Apr7-09, 03:33 PM
1. The problem statement, all variables and given/known data
A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.)
Battery _____ MJ/kg
2. Relevant equations
Unit conversion problem
1W = 1 J/s
3. The attempt at a solution
(1450 J/s / 15kg) = 96.7/10^6 = 9.6 *10^-5
A fully charged 15.0 kg lead-acid battery can deliver power 1450 W for 1.0 hr. (For comparison, the "heat of combustion" of gasoline is about 44 MJ/kg.)
Battery _____ MJ/kg
2. Relevant equations
Unit conversion problem
1W = 1 J/s
3. The attempt at a solution
(1450 J/s / 15kg) = 96.7/10^6 = 9.6 *10^-5