Potential Energy in Fuels: How Does a Fully Charged Battery Measure Up?

[aaronb]

Homework Statement

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

Homework Equations

Unit conversion problem
1W = 1 J/s

The Attempt at a Solution

(1450 J/s / 15kg) = 96.7/10^6 = 9.6 *10^-5

 

[mgb_phys]

How many Joules is 1450W times 1 hour ?