You’ve made the hypothesis that the stepper the slope , the faster a ball will be rolling when it reaches the bottom .

What should be your independent variable in an experiment testing this hypothesis?

A) how heavy the ball is

B) how steep the slope is

C) how high the ball starts on the slope

D) how fast the ball is rolling at the bottom

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