Question

A battery is charged. The percentage of the battery's capacity that is charged as a function of time (in minutes) is graphed. 100* 90 80 70 50 Capacity (% charged) 40 30 20 10+ 25 5 30 15, 20 10

Answer 1

(a) 2% per minute

Explanation:

Given a graph that shows a battery charging from 40% to 100% in 30 minutes, you want to know the charging rate in % per minute.

Slope

The slope (rate of change) is the ratio of "rise" to "run" for the line on the graph. Here, the line rises 60% from 40% to 100% when the run is 0 minutes to 30 minutes.

The ratio is ...

(60%)/(30 minutes) = 2%/minute

The battery charges at the rate of 2% per minute.

<95141404393>