How much total energy does this truck put out?
To do work, this truck uses energy stored in chemical fuel
and an electrical battery.
50 J
250 3
400 3
08003
Input
energy
2J
Kinetic
energy
400 J
Heat
250 J
Friction
150 J

Car batteries are often rated in amp-hours. this rating indicates the quantity of charge that can pass through the battery before the battery's chemical energy must be restored by the car's generator or some other source. the amp-hour unit is convenient for simple calculations. for example, a 60-amp-hour battery can supply a current of 1.0 a for 60 h (or 60 a for 1.0 h) before going dead. find the energy stored in the following. (a) a 58 a-h, 10 v car battery(b) a 1.3 a-h, 1.7 v flashlight battery